CONFIDENTIAL
LED TV
SERVICE MANUAL
CHASSIS : UA82H
MODEL : 65SK9500PUA
MODEL : 65SK9550PUA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70500905 (1803-REV02)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONTENTS
CONTENTS ............................................................................................... 2
SAFETY PRECAUTIONS ......................................................................... 3
SERVICING PRECAUTIONS .................................................................... 4
SPECIFICATION ........................................................................................ 6
SOFTWARE UPDATE .............................................................................. 9
BLOCK DIAGRAM .................................................................................. 10
EXPLODED VIEW ................................................................................... 18
ASSEMBLY / DISASSEMBLY................................................................. 19
TROUBLE SHOOTING GUIDE ................................................. APPENDIX
-2- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC Do not use a line Isolation Transformer during this check.
power line. Use a transformer of adequate power rating as this Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
protects the technician from accidents resulting in personal injury between a known good earth ground (Water Pipe, Conduit, etc.)
from electrical shocks. and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
It will also protect the receiver and it's components from being with 1000 ohms/volt or more sensitivity.
damaged by accidental shorts of the circuitry that may be Reverse plug the AC cord into the AC outlet and repeat AC voltage
inadvertently introduced during the service operation. measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
If any fuse (or Fusible Resistor) in this TV receiver is blown, 0.5 mA.
replace it with the specified. In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
When replacing a high wattage resistor (Oxide Metal Film Resistor, repaired before it is returned to the customer.
over 1 W), keep the resistor 10 mm away from PCB.
Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 MΩ and 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
-3- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES
manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as
SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or expo-
NOTE: If unforeseen circumstances create conflict between the sure of the assembly.
following servicing precautions and any of the safety precautions 3. Use only a grounded-tip soldering iron to solder or unsolder ES
on page 3 of this publication, always follow the safety precautions. devices.
Remember: Safety First. 4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as “anti-static” can generate
General Servicing Precautions electrical charges sufficient to damage ES devices.
1. Always unplug the receiver AC power cord from the AC power 5. Do not use freon-propelled chemicals. These can generate
source before; electrical charges sufficient to damage ES devices.
a. Removing or reinstalling any component, circuit board mod- 6. Do not remove a replacement ES device from its protective
ule or any other receiver assembly. package until immediately before you are ready to install it.
b. Disconnecting or reconnecting any receiver electrical plug or (Most replacement ES devices are packaged with leads electri-
other electrical connection. cally shorted together by conductive foam, aluminum foil or
c. Connecting a test substitute in parallel with an electrolytic comparable conductive material).
capacitor in the receiver. 7. Immediately before removing the protective material from the
CAUTION: A wrong part substitution or incorrect polarity leads of a replacement ES device, touch the protective material
installation of electrolytic capacitors may result in an explo- to the chassis or circuit assembly into which the device will be
sion hazard. installed.
2. Test high voltage only by measuring it with an appropriate CAUTION: Be sure no power is applied to the chassis or circuit,
high voltage meter or other voltage measuring device (DVM, and observe all other safety precautions.
FETVOM, etc) equipped with a suitable high voltage probe. 8. Minimize bodily motions when handling unpackaged replace-
Do not test high voltage by "drawing an arc". ment ES devices. (Otherwise harmless motion such as the
3. Do not spray chemicals on or near this receiver or any of its brushing together of your clothes fabric or the lifting of your
assemblies. foot from a carpeted floor can generate static electricity suf-
4. Unless specified otherwise in this service manual, clean ficient to damage an ES device.)
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable General Soldering Guidelines
non-abrasive applicator; 10 % (by volume) Acetone and 90 % 1. Use a grounded-tip, low-wattage soldering iron and appropriate
(by volume) isopropyl alcohol (90 % - 99 % strength) tip size and shape that will maintain tip temperature within the
CAUTION: This is a flammable mixture. range or 500 °F to 600 °F.
Unless specified otherwise in this service manual, lubrication of 2. Use an appropriate gauge of RMA resin-core solder composed
contacts in not required. of 60 parts tin/40 parts lead.
5. Do not defeat any plug/socket B+ voltage interlocks with which 3. Keep the soldering iron tip clean and well tinned.
receivers covered by this service manual might be equipped. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
6. Do not apply AC power to this instrument and/or any of its bristle (0.5 inch, or 1.25 cm) brush with a metal handle.
electrical assemblies unless all solid-state device heat sinks are Do not use freon-propelled spray-on cleaners.
correctly installed. 5. Use the following unsoldering technique
7. Always connect the test receiver ground lead to the receiver a. Allow the soldering iron tip to reach normal temperature.
chassis ground before connecting the test receiver positive (500 °F to 600 °F)
lead. b. Heat the component lead until the solder melts.
Always remove the test receiver ground lead last. c. Quickly draw the melted solder with an anti-static, suction-
8. Use with this receiver only the test fixtures specified in this type solder removal device or with solder braid.
service manual. CAUTION: Work quickly to avoid overheating the circuit
CAUTION: Do not connect the test fixture ground strap to any board printed foil.
heat sink in this receiver. 6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
Electrostatically Sensitive (ES) Devices (500 °F to 600 °F)
Some semiconductor (solid-state) devices can be damaged eas- b. First, hold the soldering iron tip and solder the strand against
ily by static electricity. Such components commonly are called the component lead until the solder melts.
Electrostatically Sensitive (ES) Devices. Examples of typical ES c. Quickly move the soldering iron tip to the junction of the
devices are integrated circuits and some field-effect transistors component lead and the printed circuit foil, and hold it there
and semiconductor “chip” components. The following techniques only until the solder flows onto and around both the compo-
should be used to help reduce the incidence of component dam- nent lead and the foil.
age caused by static by static electricity. CAUTION: Work quickly to avoid overheating the circuit
1. Immediately before handling any semiconductor component or board printed foil.
semiconductor-equipped assembly, drain off any electrostatic d. Closely inspect the solder area and remove any excess or
charge on your body by touching a known earth ground. Alter- splashed solder with a small wire-bristle brush.
natively, obtain and wear a commercially available discharging
wrist strap device, which should be removed to prevent poten-
tial shock reasons prior to applying power to the unit under test.
-4- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
IC Remove/Replacement 3. Solder the connections.
Some chassis circuit boards have slotted holes (oblong) through CAUTION: Maintain original spacing between the replaced
which the IC leads are inserted and then bent flat against the cir- component and adjacent components and the circuit board to
cuit foil. When holes are the slotted type, the following technique prevent excessive component temperatures.
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique Circuit Board Foil Repair
as outlined in paragraphs 5 and 6 above. Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
Removal board causing the foil to separate from or "lift-off" the board. The
1. Desolder and straighten each IC lead in one operation by following guidelines and procedures should be followed whenever
gently prying up on the lead with the soldering iron tip as the this condition is encountered.
solder melts.
2. Draw away the melted solder with an anti-static suction-type At IC Connections
solder removal device (or with solder braid) before removing To repair a defective copper pattern at IC connections use the
the IC. following procedure to install a jumper wire on the copper pattern
Replacement side of the circuit board. (Use this technique only on IC connec-
1. Carefully insert the replacement IC in the circuit board. tions).
2. Carefully bend each IC lead against the circuit foil pad and
solder it. 1. Carefully remove the damaged copper pattern with a sharp
3. Clean the soldered areas with a small wire-bristle brush. knife. (Remove only as much copper as absolutely necessary).
(It is not necessary to reapply acrylic coating to the areas). 2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
"Small-Signal" Discrete Transistor 3. Bend a small "U" in one end of a small gauge jumper wire and
Removal/Replacement carefully crimp it around the IC pin. Solder the IC connection.
1. Remove the defective transistor by clipping its leads as close 4. Route the jumper wire along the path of the out-away copper
as possible to the component body. pattern and let it overlap the previously scraped end of the
2. Bend into a "U" shape the end of each of three leads remaining good copper pattern. Solder the overlapped area and clip off
on the circuit board. any excess jumper wire.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding At Other Connections
leads extending from the circuit board and crimp the "U" with Use the following technique to repair the defective copper pattern
long nose pliers to insure metal to metal contact then solder at connections other than IC Pins. This technique involves the
each connection. installation of a jumper wire on the component side of the circuit
board.
Power Output, Transistor Device
Removal/Replacement 1. Remove the defective copper pattern with a sharp knife.
1. Heat and remove all solder from around the transistor leads. Remove at least 1/4 inch of copper, to ensure that a hazardous
2. Remove the heat sink mounting screw (if so equipped). condition will not exist if the jumper wire opens.
3. Carefully remove the transistor from the heat sink of the circuit 2. Trace along the copper pattern from both sides of the pattern
board. break and locate the nearest component that is directly con-
4. Insert new transistor in the circuit board. nected to the affected copper pattern.
5. Solder each transistor lead, and clip off excess lead. 3. Connect insulated 20-gauge jumper wire from the lead of the
6. Replace heat sink. nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Diode Removal/Replacement Carefully crimp and solder the connections.
1. Remove defective diode by clipping its leads as close as pos- CAUTION: Be sure the insulated jumper wire is dressed so the
sible to diode body. it does not touch components or sharp edges.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
-5- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range 3. Test method
This specification is applied to the LED TV used UA82H (1) Performance: LGE TV test method followed
chassis. (2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC
2. Test condition
Each part is tested as below without special appointment.
(1) Temperature: 25 °C ± 5 °C, CST: 40 °C ± 2 °C
(2) Relative Humidity: 65 % ± 10 %
(3) Power Voltage
: Standard input voltage (AC 100-240 V~, 50/60 Hz)
* Standard Voltage of each products is marked by models.
(4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
(5) The receiver must be operated for about 5 minutes prior to
the adjustment.
4. General Specification
No Item Specification Remark
1 Market North America
2 Broadcasting system ATSC / NTSC-M, 64 & 256 QAM
3 Available Channel VHF : 02~13
UHF : 14~69
DTV : 02-69
CATV : 01~135
CADTV : 01~135
4 Receiving system Digital : ATSC, 64 & 256 QAM
Analog : NTSC-M
5 Video Input NTSC-M
7 HDMI Input PC / DTV format Side, Support 6Gbps
8 Audio Input AV Audio / DVI Audio L/R Input ; Rear(Gender)
Av and DVI use same jack ;
9 SPDIF out(1EA) Optical Audio out Rear (1EA),
10 USB Input EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD
Side(2EA), Rear(1EA) for SK99, SK96, SK95, SK90,
SK85
Side(1EA), Rear(2EA) for SK89, SK80
-6- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
5. External Input Support Format
5.1. HDMI Input (PC/DTV)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed
HDMI-PC
1 640*350 31.46 70.09 25.17 EGA
2 720*400 31.46 70.08 28.32 DOS
3 640*480 31.46 59.94 25.17 VESA(VGA)
4 800*600 37.87 60.31 40 VESA(SVGA)
5 1024*768 48.36 60.00 65 VESA(XGA)
6 1360*768 47.71 60.01 84.75 VESA(WXGA)
7 1152*864 54.34 60.05 80 VESA
8 1280*1024 63.98 60.02 109.00 SXGA Support to HDMI-PC
9 1920*1080 67.5 60 158.40 WUXGA
(Reduced Blanking)
10 1920*1080 135 120 297 UDTV 1080P
11 3840*2160 54 24.00 297.00 UDTV 2160P
12 3840*2160 56.25 25.00 297.00 UDTV 2160P
13 3840*2160 67.5 30.00 297.00 UDTV 2160P
14 4096*2160 53.95 23.97 296.70 UDTV 2160P
15 4096*2160 54 24 297 UDTV 2160P
-7- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed
DTV
1 640*480 31.46 59.94 25.12 SDTV 480P
2 640*480 31.5 60.00 25.12 SDTV 480P
3 720*480 15.73 59.94 13.50 SDTV, DVD Spec. out but display
480I(525I)
4 720*480 15.75 60.00 13.51 SDTV, DVD
480I(525I)
5 720*576 15.62 50.00 13.50 SDTV, DVD
576I(625I) 50Hz
6 720*480 31.47 59.94 27 SDTV 480P
7 720*480 31.5 60.00 27.02 SDTV 480P
8 720*576 31.25 50.00 27 SDTV 576P
9 1280*720 44.96 59.94 74.17 HDTV 720P
10 1280*720 45 60.00 74.25 HDTV 720P
11 1280*720 37.5 50.00 74.25 HDTV 720P
12 1920*1080i 28.12 50.00 74.25 HDTV 1080I
13 1920*1080i 33.72 59.94 74.17 HDTV 1080I
14 1920*1080i 33.75 60.00 74.25 HDTV 1080I
15 1920*1080p 26.97 23.97 63.29 HDTV 1080P
16 1920*1080p 27.00 24.00 63.36 HDTV 1080P
17 1920*1080p 33.71 29.97 79.120 HDTV 1080P
18 1920*1080p 33.75 30.00 79.20 HDTV 1080P
19 1920*1080p 56.25 50.00 148.5 HDTV 1080P
20 1920*1080p 67.43 59.94 148.35 HDTV 1080P
21 1920*1080p 67.5 60.00 148.50 HDTV 1080P
22 1920*1080p 112.5 100 297.00 UDTV 1080P
23 1920*1080p 134.86 119.88 296.70 UDTV 1080P
24 1920*1080p 135.00 120 297 UDTV 1080P
25 3840*2160p 53.95 23.98 296.70 UDTV 2160P
26 3840*2160p 54 24.00 297.00 UDTV 2160P
27 3840*2160p 56.25 25.00 297.00 UDTV 2160P
28 3840*2160p 61.43 29.97 296.70 UDTV 2160P
29 3840*2160p 67.5 30.00 297.00 UDTV 2160P
30 3840*2160p 112.5 50.00 594 UDTV 2160P
31 3840*2160p 134.86 59.94 593.40 UDTV 2160P
32 3840*2160p 135 60.00 594 UDTV 2160P
33 4096*2160p 53.95 23.98 296.70 UDTV 2160P
34 4096*2160p 54 24.00 297 UDTV 2160P
35 4096*2160 56.25 25.00 297 UDTV 2160P
36 4096*2160 61.43 29.97 296.70 UDTV 2160P
37 4096*2160 67.5 30.00 297 UDTV 2160P
38 4096*2160 112.5 50.00 594 UDTV 2160P
39 4096*2160 134.86 59.94 593.40 UDTV 2160P
40 4096*2160 135 60.00 594 UDTV 2160P
-8- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SOFTWARE UPDATE
1. USB 2. NSU
(1) Insert the USB memory Stick to the USB port (This Function is needed to connect to the internet)
(2) Automatically detect the SW Version and show the below
message (1) Menu -> All Settings -> General -> About This TV
(3) Click [YES]: initiate the download and install of the update.
(2) C lick [CHEK FOR UPDATES] : system check newest
version
(4) C lick [Check Now]: move to “About This TV” page for
update
(5) TV is updating
(6) After finished the update, below Pop-up appear
(3) Click [DOWNLOAD AND INSTALL]
(4) TV is updating
(7) Click [Yes] : TV will be DC OFF -> ON
(8) After TV turned on, Check the updated SW Version and
Tool Option
(5) After finished the update, below Pop-up appear
(6) Turn OFF the TV and On. Check the updated SW Version
and Tool Option
-9- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
DDR4 2666
1. Main IC
X_TAL X101
24MHz 512MB
DDR4 / 1GB
2666
512MB / 1GBIC401
IC400
NTSC/ATSC3.0
DDR3 / 2133
I2C
Antenna (UHDTV) DDR3512MB
2133 IC502
TU6701 I2C 5
R IF 512MB IC501
E
A
R Antenna TS
/Cable EEPROM(NVRAM)
I2C 4
(256Kb) IC102
CVBS / SIF
eMMC
(4GB)
JK4200 IC8800
USB1 (2.0) USB3_0
Side JK4400 PMIC
USB2 (2.0) USB2_2 IC8000
JK4600
Rear USB3 (2.0) USB2_1 I2C6 Sub PMIC
IC8100
- 10 -
DATA / CLK
Main IC
JK3101
HDMI1 HDMI 2.0 PHY3_RX0N I2C 0
JK3102 I2S MAIN Audio AMP
HDMI2(ARC) HDMI 2.0 PHY2_RX0N IC5300
Copyright ©
BLOCK DIAGRAM
Side JK3103 PHY1_RX0N I2C 0
HDMI3 HDMI 2.0 Sub Audio AMP
PHY0_RX0N I2S IC5400
JK3104
HDMI4 HDMI 2.0
USB_WIFI WIFI/BT Combo
SUB
IR / KEY ASSY
ST-BY LED
Only for training and service purposes.
OPTIC SPDIF OUT
Rear Micom X_TAL
LAN ETHERNET I2C 1 IC3000
32.768KHz
X3001
LG Electronics Inc. All rights reserved.
+3.3V_NORMAL 2. I2C
IC5400 +3.3V_NORMAL
33pF 3.3KΩ
3.3KΩ
SCL0 SCL4 IC102
IC5300 100Ω 33Ω
SDA0 NVRAM
SDA4
33pF
+3.3V_NORMAL
3.3KΩ
IC3000 SCL1
MICOM 33Ω
SDA1 Main IC
- 11 -
+3.3V_TU
1.8KΩ
Copyright ©
+3.3V_NORMAL
SCL5
IC8100 33Ω TUNER
3.3KΩ SDA5
SCL2
33Ω 47pF
SDA2
IC8000
Only for training and service purposes.
LG Electronics Inc. All rights reserved.
USB1 (2.0) 3. Power
IC1100
PANEL USB1 (2.0)
13V
IC1600 / 6A USB2 (2.0)
+55V_N
NORMAL
+5V_NORMAL
IC1400 / 3A IC6900 / 2A
1.1V_DEMOD TUNER
+3.3V_NORMAL
Audio AMP
NVRAM
+13V H/P AMP
IC1500 / 3.5A
1.5V_DDR
DDR3
RS232 Control IC1501 / 3.5A
IC 1.2V_DDR DDR4
IC1700 / 4A MICOM
+3.5V_ST IC1502 / 1A
2.5V_VPP DDR4
IR_KEY
+3.5V_WOL ETHERNET
- 12 -
WIFI_EN WIFI
IC1800 / 3A
+0.9V_DDR &C4TX Main IC
Copyright ©
IC1800 / 3A IC2300 / 2A Main IC
+1.8V_IO +AVDDT_EPI_C4TX
IC2100 / 3A
Main IC
+0.9V_CPU
IC2000 / 12A Main IC
+0.9V_CORE
Only for training and service purposes.
+A20V Audio AMP Main
Audio AMP Center/woofer
LG Electronics Inc. All rights reserved.
4. Tuner
+3.3V_TU
B2[+3.3V_DEMOD]11 +1.1V Demod Core
B1[+3.3V_RF]3 +3.3V_TU
1.2KΩ
B3[+1.1V_DEMOD]13
Tuner
33 Ω SCL5
SDA5
[SCL_RF] 1
[SDA_RF] 2
[FE_DEMOD1_1_TS_CLK] 15 FE_DEMOD1_TS_CLK
[FE_DEMOD1_TS_SYNC] 16 FE_DEMOD1_TS_SYNC TP_DVB_CLK
[FE_DEMOD1_TS_VAL] 17 TP_DVB_SOP
FE_DEMOD1_TS_VAL
TP_DVB_VAL
- 13 -
FE_DEMOD1_TS_DATA[0] 18 TP_DVB_DATA0
FE_DEMOD1_TS_DATA[1] 19 TP_DVB_DATA1
FE_DEMOD1_TS_DATA[2] 20 TP_DVB_DATA2
FE_DEMOD1_TS_DATA[3] 21 FE_DEMOD1_TS_DATA [0-7] TP_DVB_DATA3
FE_DEMOD1_TS_DATA[4] 22 TP_DVB_DATA4
FE_DEMOD1_TS_DATA[5] 23 TP_DVB_DATA5
FE_DEMOD1_TS_DATA[6] 24 TP_DVB_DATA6
FE_DEMOD1_TS_DATA[7] 25 TP_DVB_DATA7
Copyright ©
Main IC
/TU_RESET1
[RESET_DEMOD] 10 GPIO26
[IF_P] 8 IF_P_TU IF_P_MAIN
Only for training and service purposes.
DMD_ADC_INP
FILTER
[IF_N] 7 IF_N_TU IF_N_MAIN
DMD_ADC_INN
[SIF] 6 AAD_ADC_SIF
[CVBS] 4 TU_CVBS
CVBS_IN1
[IF_AGC] 5 IF_AGC
IFAGC
LG Electronics Inc. All rights reserved.
SDA0/GPIO138
5. Audio Out
SCL0/GPIO139 I2C_SDA_0_AMP1 / I2C_SCL_0_AMP1
LPF Front_L
DACSCK/GPIO81 AUD_SCK IC5300
DACLRCH/GPIO82 AUD_LRCH
Front AMP LPF Front_R
DACLRCK AUD_LRCK
I2C_SDA_0_AMP1 / I2C_SCL_0_AMP1
AUD_SCK
IC5400 LPF CenterL
AUD_LRCH
Front AMP LPF
AUD_LRCK CenterR
AMP_MUTE
GPIO23 AMP_RESET_N
- 14 -
Main IC
IC3000
MICOM
Copyright ©
Tuner
TUNER_SIF
TR BUF AAD_ADC_SIF
SIDE_HP_MUTE
SPDIF_OUT
Only for training and service purposes.
HEAD PHONE
IEC958OUT
AUDA_OUTL_CH1 HP_LOUT / HP_ROUT IC6300
AUDA_OUTR_CH1 LPF
JK3403 EAN62668301
JK6200
LG Electronics Inc. All rights reserved.
JK3104
6. HDMI
DDC_SCL_4
DDC_SCL_4
DDC_SDA_4 DDC_SDA_4
TMDS Link 8bits
HDMI4 (SIDE)
HDMI 2.0
DDC_SCL_3 JK3103
DDC_SCL_3
DDC_SDA_3
DDC_SDA_3
TMDS Link 8bits
Main IC HDMI3
(SIDE)
HDMI2.0
K31
310
102
JJK3102
DDC_SCL_2
DDC_SCL_2
- 15 -
DDC_SDA_2 DDC_SDA_2
TMDS Link 8bits
HDMI_ARC
PHY0_ARC_OUT
CEC_REMOTE
HDMI2 (SIDE) with ARC
Copyright ©
HDMI 2.0
DDC_SCL_1 JK3101
DDC_SCL_1
DDC_SDA_1 DDC_SDA_1
TMDS Link 8bits
HDMI1 (SIDE)
Only for training and service purposes.
HDMI2.0
X-Tal(X3000)
MICOM Q3001
32.768kHz HDMI_CEC_MICOM
* TMDS Link 8bits = TMDS DATA 6bits(DATA0,1,2)+ TMDS CLK 2bits
LG Electronics Inc. All rights reserved.
Main IC
USB2.0
USB1(SIDE)
USB3.0_1_DM0 +5V_USB_1
USB3.0_1_DP0 OCP
+5V_NORMAL
/USB_OCD2 JK4200 IC4301
USB_CTL2
USB2.0
USB2(SIDE)
USB2.0_2_DM1 +5V_USB_2
USB2.0_2_DP1 IC1600
+5V_NORMAL
/USB_OCD2 JK4400 OCP 5V / 6A
USB_CTL2 IC4501
USB2.0
USB3(Rear)
7. USB / WIFI / M-REMOTE / UART
USB2.0_3_DM0 +5V_USB_3
USB2.0_3_DP0 +5V_NORMAL
/USB_OCD2 JK4600 OCP
USB_CTL2 IC4700
- 16 -
WIFI_DM
USB2_2_DM0
USB2_2_DP0 WIFI_DP
WIFI Combo
Copyright ©
BT_RESET
BT_WAKEUP_DEVICE
BT_WAKEUP_HOST
SOC_TX
UART0_TXD/GPIO105
SOC_RX IC7200
UART0_RXD/GPIO106
Only for training and service purposes.
MICOM(IC3000)
LG Electronics Inc. All rights reserved.
8.EPI 68Pin Interface
Main IC
Sub PMIC
IC8100
I2C
IC8000
PMIC
P7800
P7801
TX 6lane
TX 6lane
GMA/CLK
TS-CIC_Data
GMA/CLK
VCOM
VCOM
Lock_In
- 17 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
EXPLODED VIEW (SET)
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
921
710
920
400
910
900
350
120
HS1
521
121
540
530
800
HP1
LV2
820
LV1
700
200A
A9
200
A10
AR2
- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ASSEMBLY / DISASSEMBLY GUIDE (SET)
[Disassembly Guide]
(1) Lay the TV Set on a flat Pad and Remove the stand screw 4ea.
SK85
SK95
After separate stand cover, Remove the stand screw 4ea.
- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
[Disassembly Guide]
(2) Remove the bottom screw 5ea. (Additional, for 65” Remove 1ea Screw of the Power Cord Bracket)
(3) After recognizing a B/C, Ready to remove the B/C
65SK85/95 Latch 18 Point 55SK85/95 Latch 16 Point
65SK85/95 Screw 6 Point 55SK85/95 Screw 5 Point
49SK85 Latch 14 Point
49SK85 Screw 5 Point
Plate Spring
B/C assembly structure = Module (Plate Spring) + BackCover (Latch)
- 20 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(4) Hold the left bottom handle and lift the B/C. At the same time, gently pushing the left side of the B/C toward the inside of the set.
(Separate the B/C from bottom to top direction)
* If push with strong force from left side, Side Latch will break.
Handle L
push
push
Up
Up
push
Up
<4-2>
<4-1>
Up
- 21 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(5) H
old the right bottom handle and lift the B/C. At the same time, gently pushing the right side of the B/C toward the inside of the
set. (Separate the B/C from bottom to top direction)
* If push with strong force from right side , Side Latch will break.
Handle R
push
push
Up
Up
push
<5-3>
Up
<5-2>
<5-1>
Up
- 22 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(6) H
old the left/right bottom handle and lift the bottom of the B/C. After, with one hand, pushing the B/C in the upward direction and
at the same time, with the other hand tap the right bottom of the B/C 2 or 3 times in the upward direction.
8~12cm
(7) W
ith one hand, Pushing the B/C in the upward direction and at the same time, With the other hand tap the left bottom of the B/C
2 or 3 times in the upward direction.
- 23 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(8) F
inally, With one hand, Pusing the B/C in the upward direction and simultaneously, With the other hand tap the center bottom
of the B/C 2 or 3 times in the upward direction. And Make sure that the top of the B / C is completely separated from the plate
spring.
Check the Latch
separation
* If Push the bottom of the B/C upwards with a strong force, Top Latch may break.
(9) Supports the bottom of the B/C center.
- 24 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(10) Remove the B/C.
- 25 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
[Assembly Guide]
(1) Place the B/C in the module plate spring. and Press Latch Points to assemble the B/C.
B/C Latch
push
plate Spring
65SK85/95 Latch 18 Point
55SK85/95
Latch 16 Point 49SK85
Latch 14 Point
(2) Check whether gap occurs in the Top/left side/right side of the B/C
- 26 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(3) Assemble the Bottom screw. (5ea)
(For 65”, After assemble the Power Cord Bracket, assemble the 1ea Screw)
65SK85/95
65SK85/95 Screw 6 Point
55SK85/95
55SK85/95 Screw 5 Point
49SK85
49SK85 Screw 5 Point
- 27 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(4) Assemble the stand screw 4ea.
SK85
SK95
- 28 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
TROUBLE SHOOTING GUIDE
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Contents of Standard Repair Process
No. Error symptom (High category) Error symptom (Mid category) Page Remarks
1 No video/Normal audio 1
2 No video/No audio 2
3 A. Video error Picture broken/ Freezing 3
4 Color error 4
Vertical/Horizontal bar, residual image, light
5 5
spot, external device color error
6 No power 6
B. Power error Off when on, off while viewing, power auto
7 7-8
on/off
8 No audio/Normal video 9
C. Audio error
9 Wrecked audio/discontinuation/noise 10
10 Remote control & Local switch checking 11
11 Motion remote operating checking 12
D. Function error
12 Wifi operating checking 13
13 External device recognition error 14
14 E. Noise Circuit noise, mechanical noise 15
15 F. Exterior error Exterior defect 16
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
No video/ Normal audio Revised date 1/16
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, EPI Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A9
No video Normal Y Check lock Y Check Power Normal Y
Normal audio 0V Replace Main Board
audio voltage Board (Main) voltage
20V, 12V etc.
N N N
Move to No Check Power Board (Module) 24V output Repair Power
☞A9
video/No audio Board or parts
Normal Y
Replace module
voltage
End
N
Repair Power
Board or parts
※Precaution ☞A4 & A2
Always check & record S/W Version and White
Replace Main Board Re-enter White Balance value
Balance value before replacing the Main Board
1
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
No video/ No audio Revised date 2/16
☞A9
Check various voltages Check and
Y
No Video/ of Power Board (Main) Normal
replace
No audio (20V, 12V…) voltage?
MAIN B/D
N End
Replace Power
Board and repair
parts
2
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
Picture broken/ Freezing Revised date 3/16
. By using Digital signal level meter
☞ A3
. By using Diagnostics menu on OSD
Check RF Signal level ( All Settings→ Channels → Channel Tuning → Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Y Check whether other equipments have problem or not.
Normal
(By connecting RF Cable at other equipment)
Signal?
→ DVD Player ,Set-Top-Box, Different maker TV etc`
N
☞ A4
Check RF Cable
Normal Y Check SVC N Check Y
Connection Close
1. Reconnection Picture? S/W Version Bulletin? Tuner soldering
2. Install Booster N
Y
N
S/W Upgrade
N Contact with signal distributor
Normal
Picture? or broadcaster (Cable or Air)
Normal N
Y Picture? Replace
Main B/D
Y
Close
Close
3
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
Color error Revised date 4/16
☞A6 ☞ A7
※ Check
Check color by input
and replace
-External Input Y Y Y
Color Link Cable Color Color
-AV Replace Main B/D Replace module
error? (V by one) error? error?
-HDMI
and contact
N condition N N
Check error End
color input
mode
☞A15 Check
External device Y
External Input external
Check Test pattern /Cable Replace Main B/D
error device and
normal
cable
N
Request repair
for external
device/cable
N
Check external External device Y
HDMI
device and /Cable Replace Main B/D
error
cable normal
4
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
A. Video error Established
Error date
symptom Vertical / Horizontal bar, residual image,
light spot, external device color error Revised date 5/16
Vertical/Horizontal bar, residual image, light spot Replace
Module
☞A6
☞ A7 N
Check color condition by input Check external
Y Check and
-External Input Screen Y device Screen N Screen
-HDMI Normal? replace Link Replace Main B’D
normal? connection normal? normal?
Cable
condition
N for LGD Panel Y
N Y
Replace Main B’D
Replace Request repair End End
module for external
☞A15 device
Check Test pattern
External device screen error-Color error
Check screen Connect other external N
condition by input External device and cable Screen Replace
N -External Input Input (Check normal operation of normal? Main B/D /
Check S/W Version Check
-AV error External Input, HDMI/DVI Module
version
-HDMI/DVI by connecting Jig, pattern
Y
Generator ,Set-top Box etc.
Y Request repair for
external device
S/W Upgrade
Y
Connect other external
device and cable N
(Check normal operation of Screen Replace
HDMI/ Main B/D /
External Input, Component, normal?
DVI Module
Normal N RGB and HDMI/DVI by
screen? connecting Jig, pattern
Generator ,Set-top Box etc.
Y
End
5
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error B. Power error date
symptom
No power Revised date 6/16
☞A8 ☞A9
DC Power on Replace
Check Power LED Y Normal N Check Power Y
by pressing Power Key OK? Power
Logo LED On? operation? On ‘”High”
On Remote control B/D
. Stand-By: Red or Turn On
N Y
. Operating: Turn Off
Check Power cord Replace Main B/D
was inserted properly
☞A9
N Measure voltage of each output of Power B/D
Normal?
Y
Y Y
Normal Replace Main B/D
voltage?
Close Normal
Check ST-BY (7.8V)
Y
voltage? N
☞A9 Replace Power B/D
N
Replace Power
B/D
6
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error B. Power error date
symptom
Off when on, off while viewing, power auto on/off Revised date 7/16
Check outlet
☞A10
N Y
Check A/C cord Error? Check Power Off CPU
Replace Main B/D Normal? End
Mode Abnormal
N
Check for all 2- phase
power out Y Abnormal Replace Power B/D
1
Fix A/C cord & Outlet ☞A9
and check each 2
(If Power Off mode
phase out
is not displayed) Normal Y
Replace Main B/D
Check Power B/D voltage?
voltage
N
※ Caution
Check and fix exterior Replace Power B/D
of Power B/D Part
* Please refer to the all cases which Status Power off List Explanation
"POWER_OFF_BY_REMOTE_KEY” Power off by REMOTE CONTROL
can be displayed on power off mode.
"POWER_OFF_BY_OFF_TIMER" Power off by OFF TIMER
"POWER_OFF_BY_SLEEP_TIMER" Power off by SLEEP TIMER
"POWER_OFF_BY_INSTOP" Power off by INSTOP KEY
"POWER_OFF_BY_AUTO_OFF" Power off by AUTO OFF
Normal "POWER_OFF_BY_ON_TIMER" Power off by ON TIMER
"POWER_OFF_BY_RS232C" Power off by RS232C
"POWER_OFF_BY_RESREC" Power off by Reservated Record
"POWER_OFF_BY_RECEND" Power off by End of Recording
"POWER_OFF_BY_SW_DW" Power off by S/W Download
"POWER_OFF_BY_UNKNOWN" Power off by unknown status except listed case
"POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble
Abnormal
"POWEROFF_CPUABNORMAL" Power off by CPU Abnormal
7
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error B. Power error date
symptom
Off when on, off while viewing, power auto on/off Revised date 8/16
* Please refer to the all cases which can be displayed on power off mode.
Power Off list Explanation Action contents
Power off when TV is not turned off during a certain time
KEYTIMEOUT RESULT : micom force to trigger TV power off. Check & Change Main B/D
CONDITION : When pressing power key while power on/off status, CPU does not response within 8 seconds
Almost the same as Power Off by KEYTIMEOUT. If there is no vaild communication
Bet ween CPU and MICOM for more than 5 seconds, the MICOM switcheds off PSU and
1SEC Power OFF Check & Change Main B/D
Records. Power off by 1SEC Power off. In this case, we don’t have information where the
malfunction exactly occurred. But in in indicates that CPU had stopped and rebooted.
In case of AC Off (It is normal when the power cord is unplugged.) Normal
ACDET
If there are many ACDETs connected, Power Board is defective Check & Change Power B/D
Power off by unstable AC power detect.
RESULT : micom check the stable power.
5V MNT Check & Change Power B/D
CONDITION : When AC on or DC on, stabilization check routine (Power Detect High
Check) fail after multi power on.
CPUABNORMAL If the CPU attempts to reset in case of abnormal operation and Shut Down in case of failure. Check & Change Main B/D
Power off when receiving no ack.
NO POLING RESULT : TV power off/on (Reboot) Check & Change Main B/D
CONDITION : There is no I2C response from CPU for 15 seconds.
CPUCMD Power off by main SoC command. Check & Change Main B/D
Power off by module error (OLED)
INV_ERROR Check & Change OLED Module
CONDITION : OLED Module send signal to micom
ONRF_FAIL RESULT : Reboot, CONDITION : OLED module compensation is running but fails. Check & Change OLED Module
PNWASHFAIL Power off by panel noise wash function fail case. Check & Change OLED Module
RESET When Micom is reset by AC Off
KEY Power off by Local key
OFFTIMER Power off by Off timer
SLEEPTIMER Power off by sleep timer
NOSIG Power off by No Signal
FANSTOP Power off by FAN operation stopped
INSTOP Power off by Instop Key
Normal Case
AUTO OFF Power off by auto off function
RESREC Power off by reserved recording
RECEND Power off when recording stops
SWDOWN Reboot by SW down load function
UNKNOWN No meaning (same as initial value)
COMP_END OLED threshold voltage degradation(Compensation) completes.
PNWASHDONE Power off by panel noise wash function complited. (OLED)
8
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error C. Audio error date
symptom
No audio/ Normal video Revised date 9/16
☞A11 ☞A12+A9
No audio
Check user N Check audio B+
Normal Y
menu > Off 20V of Power
Screen normal voltage
Speaker off Board
Y N
Cancel OFF Replace Power Board and repair parts
Check N
Disconnection Replace MAIN Board End
Speaker
disconnection
Y
connecting Speaker
9
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error C. Audio error date
symptom
Wrecked audio/ discontinuation/noise Revised date 10/16
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
Wrecked audio/
☞A12+A9
Check and replace
Discontinuation/ Check audio
speaker and
Noise for B+ Voltage (20V)
connector
Check input all audio
signal Y Y
Signal
-RF
normal? Wrecked audio/
-External Input Normal
signal Discontinuation/
N Replace Main B/D voltage?
Noise only
for D-TV
N
Wrecked audio/
Discontinuation/
Replace Power B/D
Noise only
for Analog
(When RF signal is not
received)
Request repair to external Wrecked audio/ Replace Main B/D End
cable/ANT provider Discontinuation/
Noise only
for External Input
(In case of N
External Input Connect and check Normal
signal error) other external audio?
Check and fix device
external device Y
Check and fix external device
10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
D. Function error Established
Error date
symptom
Remote control & Local switch checking Revised date 11/16
1. Remote control(R/C) operating error Replace
Main B/D
☞A13 ☞A13 ☞A13
Check & Repair N Check B+ Y Y
Check R/C itself Normal Y Normal Normal Check IR Normal
operating? Cable connection operating? 3.5V Voltage? Signal?
Operation Output signal
Connector solder On Main B/D
N Y N N
☞A9
Check R/C Operating Check & Replace Check 7.8V on Power B/D Repair/Replace
Close
When turn off light Baterry of R/C Replace Power B/D or IR B/D
in room Replace Main B/D
(Power B/D don’t have problem)
If R/C operate, Normal Y
operating? Close
Explain the customer
cause is interference
from light in room. N
Replace R/C
11
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
D. Function error Established
Error date
symptom
MR18 operating checking Revised date 12/16
2. MR18(Magic Remocon) operating error
☞A4
N Check MR18
Check the RF Receiver ver Normal Y Press the Is show ok N Turn off/on the
itself Operation
INSTART menu is “00.00”? operating? wheel message? set and press
the wheel
N Y
Y
☞A14
Check & Replace
Check & Repair Battery of MR18 Close
RF assy
connection
Normal Y
☞A4 operating? Close
Is show ok N Press the back
RF Receiver ver N message? key about 5sec
Close N
is “00.00”?
Y
Replace
MR18
Y
Close
Down load the Firmware
* INSTART MENU12.RF •If you conduct the loop at 3times,
Remocon Test Receiver change the MR18.
Firmware download
12
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error D. Function error date
symptom
Wifi operating checking Revised date 13/16
3.Wifi operating error
☞A4 ☞A14
Check the Wi-Fi Mac value N Check the Wifi wafer Normal N Replace
INSTART menu is “NG”? 1pin Voltage? Main B/D
Y
☞A14 Y
Check & Repair Close
Wifi cable
connection
☞A4
Wi-Fi Mac value N
is “NG”? Close
Y
Change the Wifi
assy
13
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error D. Function error date
symptom
External device recognition error Revised date 14/16
Y Check technical
Check
Signal information Technical N External Input
input Replace Main B/D
input? - Fix information information? Recognition error
signal
- S/W Version
N Y
HDMI/
Check and fix DVI, Optical
Fix in Replace Main B/D
external device/cable Recognition error
accordance
with technical
information
14
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error E. Noise date
symptom
Circuit noise, mechanical noise Revised date 15/16
Identify Check
Circuit Replace PSU
nose location of
noise
type noise
Mechanical Check location of
noise noise
※ When the nose is severe, replace the module
※ Mechanical noise is a natural (For models with fix information, upgrade the
phenomenon, and apply the 1st level S/W or provide the description)
description. When the customer does not OR
agree, apply the process by stage. ※ If there is a “Tak Tak” noise from the
※ Describe the basis of the description cabinet, refer to the KMS fix information and
in “Part related to nose” in the Owner’s then proceed as shown in the solution manual
Manual. (For models without any fix information,
provide the description)
15
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error F. Exterior defect date
symptom
Exterior defect Revised date 16/16
Zoom part with Module
Replace module
exterior damage damage
Cabinet
Replace cabinet
damage
Remote
control Replace remote control
damage
Stand
Replace stand
dent
16
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Contents of Standard Repair Process Detail Technical Manual
No. Error symptom Content Page Remarks
1 Check EPI lock A1
A. Video error_ No video/Normal audio
2 Check White Balance value A2
TUNER input signal strength checking
3 A3
method
A. Video error_ video error /Video
4 lag/stop Version checking method A4
5 Tuner Checking Part A5
A. Video error _Vertical/Horizontal bar,
6 Connection diagram A6
residual image, light spot
Check Link Cable (EPI) reconnection
7 A. Video error_ Color error A7
condition
A-1/11
Cable (1) ~ (2)
A-2/11
Exchange Main Board (1) ~ (3) A-3/11 ~ A-5/11
9
Exchange Module (1) ~ (3) A-6/11 ~ A-10/11
T-con (1) ~ (2) A-9/11 ~ A-10/11
Exchange Power Board (PSU) A-11/11
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Contents of Standard Repair Process Detail Technical Manual
Continued from previous page
No. Error symptom Content Page Remarks
10 Check front display LED A8
B. Power error_ No power
11 Check power input Voltage & ST-BY 3.5V A9
12 B. Power error_ No power Check power LED indicator A10
B. Power error_ Off when on, off while
13 POWER OFF MODE checking method A11
viewing
Checking method in menu when there is no
14 A12
audio
C. Audio error_ No audio/Normal video
Voltage and speaker checking method when
15 A13
there is no audio
16 Remote control operation checking method A14
D. Function error
Motion Remote / Wifi operation checking
17 A15
method
A16 ~
18 How to use the Service remote control
A18
19 After changing Main Board, Checking list A19
E. Etc
20 Operation Test Pattern – ADJ A20
How to use JIG
21 A21
(Power B/D Diagnostic Smart Jig Multi Gender)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom A. Video error_No video/Normal audio
Content Check EPI Lock A1
R7801: 1.8V (normal)
After Remove the Rear Cover, turning on the power and check with the naked eye,
Whether you can checking voltage of R7801
A1
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom A. Video error_No video/Normal audio
Content Check White Balance value A2
Entry method
1. Press the ADJ button on the remote control for adjustment.
2. Enter into White Balance of item 12.
3. After recording the R, G, B (GAIN, Cut) value of Color Temp
(Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD.
A2
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom A. Video error_Video error, video lag/stop
Content TUNER input signal strength checking method A3
All Settings Channels Channel Tuning
Manual Tuning
When the signal is strong, use the attenuator
(-10dB, -15dB, -20dB etc.)
A3
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom A. Video error_Video error, video lag/stop
Content TV Version checking method A4
Version
Press the IN-START with the remote control for adjustment
A4
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom
A. Video
A. Videoerror_Video
error_Videoerror,
error,video
video lag/stop
lag/stop
TV date
Revised
Content Content TUNERchecking
TUNER checkingpart
part A5
date
Checking method:
1. Check the signal strength or check whether the screen is normal when the external device is connected.
2. After measuring each voltage from power supply, finally replace the MAIN BOARD.
A5
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom
Error A.A. Video
Video error
error _Vertical/Horizontal
_Vertical/Horizontal bar,
bar, Established
symptom residual
residual image,
image, light
light spot
spot date
Revised
Content Content TVTV Connection
connection diagram
diagram date A6
As the part connecting to the external input, check
the screen condition by signal
A6
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom A. Video error_Color error
Content Check Link Cable (EPI) reconnection condition A7
Check the contact condition of the Link Cable, especially dust or mis insertion.
A7
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Image error) Check for poor cable contact
Symptom
Item Cause Symptom Image
Name
Pin 단선
CABLE Color smear Poor broken pin of FFC cable
Color is Excessive due to FFC Cable
CABLE R Color Excessive
Contact.
screen is dark due to poor contact due
CABLE Screen darkness to disconnection of the FFC cable pin.
G color transient due to poor FFC cable
CABLE G Color Excessive connection
A - 1/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Image error) Check for poor cable contact
Symptom
Item Cause Symptom Image
Name
CABLE Color spread LVDS cable connection problem
CABLE Color spread LVDS cable connection problem
CABLE Color spread LVDS cable connection problem
Due to foreign substance withi nLVDS
CABLE Screen stop cable PIN
A - 2/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Main Screen noise Bit noise from horizontal screen
Broken screen due to
Main Screen noise
Main IC problem
Main Dark picture Dark left-side screen
Top/bottom screen part
Main Broken picture
Picture problem due to tuner
Inner side quality problem
A - 3/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Main Broken screen Broken screen in a horizontal manner
Main Screen spread Screen corner appears blurry
Main Color Spread Color spread on the screen
Main Blurry Screen Blurry picture on the screen
A - 4/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
No problem at the initial stage,
Main Broken picture G-color spread after 10 minutes
Right-side
Main
Screen Right-side screen problem
problem
LG logo
Main Screen picture spread problem
Screen problem
No problem at the initial stage.
Right-side
Main During Heat run, right-side picture
picture problem
problem
A - 5/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Un-repairable Cases
Module Vertical bar
In this case please exchange the module
Module image broken Source Driver issue
Module White dot White dot cause by panel issue
Module Line Dim Vertical Line cause by source drive IC
A - 6/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Module Burnt Module burnt
Module Horizon line Module has damaged
Module has damaged
Module Line Defect
Un-repairable Cases
Module Press damage
In this case please exchange the module
A - 7/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Module Vertical bar Vertical Bar cause by source drive IC
Vertical Noise Un-repairable Cases
Module Brightness
In this case please exchange the module
difference
Module Green light Compensation error when Power On/off
Color difference between screen cause
Module Color difference by compensation error
A - 8/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Module has damaged
Module No image
(Can’t fix it)
Burnt
Module Burnt
(Can’t fix it)
Screen Mura
Module Mura
(Can’t fix it)
A - 9/10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix : Exchange Power Board (PSU)
No Light No picture/Sound Ok
A - 11/11
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom B.Power
B. Powererror
error_No
_Nopower
power date
TV Revised
Content Content Check
Checkfront
frontdisplay LED
display Logo date A17
A8
LED
ST-BY condition: On or Off
Power ON condition: Turn Off
A8
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom
B.B.
Power error
Power _No
error power
_No power
TV date
Revised
Content Content Check
Checkpower
powerinput voltage
input and
voltage ST-BY
and 3.5V
ST-BY 3.5V A9
A18
date
55/65SK9000PUA Power Board Voltage & Current
DC 13.2V line ST-BY Votage
A9
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom
B.
B.Power
Powererror _No
error power
_No power
TV date
Revised
Content Content Check power input
Check voltage
Power LEDand ST-BY 3.5V
Indicator A10
A18
date
LED Error checking method
1. Output : Blinking the specified number of times during abnormal operation (approx 6 sec interval)
2. Condition : Error message sent via LED flashing count when the LED driver is in an abnormal operation.
3. Abnormal condition
1) Open LED Protection
2) Short LED Protection
3) DC/DC Voltage Check
4) P-Dim1 error
5) Driver On signal error
6) Local dimming data error
7) Driver IC error or MCU error Check
8) V-sync No approve
< Slim Direct >
A10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error
Error symptom
symptom B. Power
B. Power error
error _Off
_Offwhen
whenon,
on, off
off whiling viewing Established
whilingviewing
TV date
Revised
Content Content POWER OFF MODE checking method date A11
A19
Entry method
1. Press the IN-START button of the remote control for adjustment
2. Check the entry into adjustment item 3 (Power On/Off Status)
A11
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom C.
C.Audio
Audio error_No
error_Noaudio/Normal
audio/Normalvideo
video
TV date
Revised
Content Content Checking
Checkingmethod
methodin
inmenu
menuwhen
whenthere
thereis
isno
noaudio
audio date A12
A20
Checking method
1. Press the Setting button on the remote control
2. Select the Sound function of the Menu
3. Select the Sound Out
4. Select TV Speaker`
A12
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom C.C.
Audio error_No
Audio audio/Normal
error_No video
audio/Normal video date
TV Revised
Content Voltage and
Voltage speaker
and checking
speaker method
checking method A13
A21
Content date
when
whenthere is no
there audio
is no audio
Output Voltage Current Output Inch Voltage Typycal
STBY 7.56Vrms ~ 9.24Vrms 17mA(0~17mA) 65 85.35~115.91 V 96.7V
13.2V 12.54V ~ 13.86V 3.2A (0.1~3.2A VLED 55 68.28V~92.77V 77.4V
20.0V 18V ~ 22V 0.8A (0.1~0.8A) 49 71.6V~96.6V 77.7V
①
②
③
1 SPK_R-FT 5 SPK_R-CF
2 SPK_R+FT 6 SPK_R+CF
Checking method without Audio
3 SPK_L-FT 7 SPK_L-CF
4 SPK_L+FT 8 SPK_L+CF
1.Check the contact condition of or 13.2V connector of Main Board
① Checking voltage 20V of Main Board
② Checking voltage 20V of Power Board
③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the
GND and output terminal, the speaker is normal.
A13
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom D. Function
C. Audio error_No error video
audio/Normal
TV date
Voltagecontrol
and speaker checking method Revised
Content Content Remote operation checking method A14
A21
when there is no audio date
Pin Pin name
1 +3.5V_WIFI
① 2 WIFI_DM
IR & EYE Sensor 3 WIFI_DP
4 GND
5 WOL/WIFI_PWR_ON
6 +3.5V_WIFI
7 RESET
8 GND
9 BT_WAKE_UP_DEVICE
10 BT_WAKE_UP_HOST
11 GND
12 No Connection
13 No Connection
14 No Connection
15 No Connection
16 EYE_SDA
IR LED Eye ③
17 EYE_SCL
18 GND
19 IR
20 LED_R
② 21 GND
22 3.5V
23 KEY2
24 KEY1
25 GND
Checking order to check remote control
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.5V on the terminal 4
A14
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom
D.D.Function
Functionerror
error
TV date
Revised
Content Content Motion
Motionremote
Remote
Wifi & wifi operation
operation
operation checking
checking
checking method
method
method date A15
A23
A24
Pin Pin name
1 +3.5V_WIFI
① Wifi & BT Front 2 WIFI_DM
3 WIFI_DP
4 GND
5 WOL/WIFI_PWR_ON
6 +3.5V_WIFI
7 RESET
8 GND
9 BT_WAKE_UP_DEVICE
10 BT_WAKE_UP_HOST
11 GND
Wifi & BT Rear 12 No Connection
13 No Connection
14 No Connection
15 No Connection
③ 16 EYE_SDA
17 EYE_SCL
18 GND
19 IR
20 LED_R
21 GND
22 3.5V
23 KEY2
② 24 KEY1
Checking order to check motion remote/wifi 25 GND
Checking order
1. Check IR cable condition between IR & Main board.
2. Check the 3.5V on the terminal 1
A15
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom D. Function error
Content How to use the Service remote control A16
1. How to access the remote control
0 4 1 3
0 4 1 3
A16
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom D. Function error
Content How to use the Service remote control A17
2. Remote control part definition
POWER Power On/Off
[ETC] Each time pressing the KEY button, Mode gets changed to ETC and P-ONLY each time
ETC (Added Function) All KEY function [PIP PR-][PIP PR+][SWAP]
[PIP INPUT][DVI] KEY Function
Changed to factory mode
P-ONLY (Added
Function)
All KEY function &[INFO][STILL][HDMI HOT][USB HOT][HDMI4] KEY Action
INPUT Change to the external device mode
ARC Change in the order of 16:9=>Zoom1=>Zoom2=>Cinema Zoom=>Aucto Screen=>4:3=>16:9
Changes in the order of Bright Picture=>Easy Picture=>Cinema=>Spots=>Game=>
PSM
Custom PIcture1=>Custom Picture2=>Bright Picture
SSM (Added Function) Standard(user)=>music=>cinema=>sports=>game=>standard(user)
PIP Picture In Picture is activated
TEXT Access to the Power Only mode
CAP Broadcasting caption(on/off)
MPX Stereo mode (mono, stereo, foreign language) access
Used when in factory mode
Simplink (Added
Access to the Simplink-connected device
Function)
Digital EYE function ON/OFF
EYE
For some Model, access to the Test Pattern
TILT Used for screen tilting change (Access to the old PDP control mode)
A17
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom D. Function error
Content How to use the Service remote control A18
B-TOOTH
Connected to Blue-Tooth
(Added function)
Model Nam ex) 42PG60D-NA Current Model Name S/W Version ex)
IN-START V03.11.0 Current S/W version
MICOM Version ex) V3.05.0 current Mi-Com version UTT ex) User TV total usage time
POWER OFF STATUS ex) Shows power-off status
ADJ
Test Pattern (Off=>White=>Red=>Green=>Blue=>Black=>Pattern=>Off) Change
X-STUDIO (Added function) HDD,USB, external device’s HDD screen is activated
MENU User function gets activated
EXIT Exit from the current mode
TIME SHIFT (Added
Moves forward/backward of recorded contents
function)
MUTE Mute function (0 Volume)
IN-STOP SET to factory mode
VOL + - Volume Up/Down
CH + - Channel Up/Down
AV1,2,3 (Added function) Connects to external input 1,2,3
COMP1,2 (Added function) Connects to Component 1,2
HDMI1,2,3,4
Connects to HDMI 1,2,3,4
(Add function)
DVI (Add function) Connects to DVI
A18
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Error symptom
symptom
E. Etc error
D. Function
TV date
Revised
Content Content After
Motion Changing
Remote
Wifi Main
operation
operation Board, Check
checking
checking list
method
method date A19
A23
A24
After Changing Main Board, Check list(Model Number D/L, White Balance)
1. Go to Instart button of Operation remote
7번. Choice a Model Number D/L
- Model name & Serial Number
백커버 뒤에 ID Label 확인하여 입력한다.
2. Go to ADJ button of Operation remote.
13번. White Balance로 진입
- 색온도의 R, G, B (GAIN, Cut) 값을
기록한 후 메인보드 교체
A14
A19
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom E. Etc
Content Adjustment Test pattern A20
Press the P-ONLY HDMI HOT CH + or -
You can view 11 types of patterns using the CH+ or - key
Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)
4.Video error (Classification of MODULE or Main-B/D!)
A20
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Smart JIG Power Diagnosis
Muitl Gender Guide
(P/N : RAD32507801) (P/N : RAD33187801)
A 21 (1/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Power Board Muitl Gender JIG Diagram (P/N: RAD33187801)
15Y 15Y
(LF/UF Series) (OLED)
※ 12/13/14Y Smart JIG
connector applied 28Pin 24Pin 24Pin 24Pin NC
24Pin
18Pin 16Y
(OLED)
24Pin
13Y/14Y 28Pin
17Y
(OLED)
24Pin 12Y
28Pin
SK85/SK96
SK95/SK99 UK64/UK65
16Y/17Y
18Pin (UH/UJ)
12Pin 12Pin 28Pin 28Pin
28Pin
Includes 49UJ63
17Y 16Y 16Y/17Y 16Y/17Y 16Y
(SJ/UJ) (UH) (LH/LJ) (UH/SJ) (UH) A21 (2/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Power Board Muitl Gender JIG Diagnostic model List
Existing 12Y, 13Y, 14Y, 15Y LED models included
15Y, 16Y, 17Y OLED, 16/17 Y LED model Power diagnosis function newly added
<15Y/16Y/17Y OLED Model, 16Y/17Y LED Model>
Year Product Model
EG92/EG93/EG94
‘15 OLED EG96
EF95
B6
C6
OLED
E6
G6
‘16 UH95/UH96
UH85/UH93
UH77/UH87
LED
UH75/UH76
UH65/UH68
LH68, LH66, LH60,LH54
B7
C7
‘17 OLED E7
G7
W7
SJ95/UJ98
SJ85/UJ94
SJ80, UJ77
UJ75/UJ78
’17 LED
UJ65/UJ68
UJ63/UJ67
LJ61/LJ68
LJ55/LJ58
A21 (3/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Power Board Muitl Gender How to Connect
1
▶ Power Board Muitl Gender JIG
2
“A: 2013 LCD POWER”
2014
▶ Connect the Muiti Gender to the connector (black)
as shown in picture 2 of the Smart JIG.
A21 (4/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Smart Jig Voltage Setting
1 2
▶ Switch the product S/W in JIG to LCD.
▶ LCD MODEL Check the power voltage
▶ Check power board voltage. and switch to the correct voltage.
※ Note on set up
(The correct power diagnosis can be made only if it is set correctly.)
- 24V Power Board : Change the switch to 24V of Smart Jig Voltage
- 20V Power Board : Change the switch to 24V of Smart Jig Voltage
- 13.2V/18V Power Board : Change the switch to 24V of Smart Jig Voltage
Power B/D Smart Jig Voltage Switch
24V 24V
20V 20V
13.2V/18V 24V
A21 (5/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`15Y OLED(EG96,EF95,EG92,EG93,EG94) Power Board Diagnostic method (1)
1 2
▶ Switch the product S/W in JIG to LCD.
▶ LCD MODEL Check the power voltage
and switch(24V) to the correct voltage.
▶ Check power board voltage. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl
Gender JIG 24Pin connector
A21 (6/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`15Y OLED(EG96,EF95,EG92,EG93,EG94) Power Board Diagnostic method (2)
5 6
▶ When the OK LED(24V,12V) turns on, Power Board is normal.
▶ When the NG LED turns on, the Power Board
can be judged as defective.
A21 (7/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y OLED(B6) Power Board Diagnostic method
1 2
▶ Switch the LCD MODEL S/W to 24V by checking
the power voltage.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
▶ Connect the 24Pin Power Cable connector
to the Multi gender JIG 24Pin connector.
3
▶ When the OK LED(24V,12V) turns on, Power Board is normal.
▶ When the NG LED turns on, the Power Board
can be judged as defective.
A21 (8/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y OLED(C6) Power Board Diagnostic method
1 2
▶ Check power board voltage. ▶ Disconnect the Main Board 24Pin Power Cable connector.
▶ Smart JIG: Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 24Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 24Pin connector
A21 (9/19)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y OLED(E6) Power Board Diagnostic method
1 2
▶ Check power board voltage. ▶ Disconnect the Main Board 24Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 24Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board
A21 (10/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y OLED(G6) Power Board Diagnostic method
1 2
▶ Check power board voltage. ▶ Disconnect the Main Board 24Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 24Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board
A21 (11/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`17Y OLED(B7/C7/E7/G7) Power Board Diagnostic method
1 2
▶ Disconnect the Main Board 28Pin Power Cable connector. ▶ Connect the 28Pin Power Cable connector
to the Muitl Gender JIG 28Pin connector
3 4
▶ Switch the LCD MODEL S/W to 20V by checking ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
the power voltage.
▶ When the NG LED turns on, the Power Board
▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A21 (12/19)
can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`17Y OLED(W7) Power Board Diagnostic method
1 2
▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector
to the Muitl Gender JIG 28Pin connector
3 4
▶ Switch the LCD MODEL S/W to 20V by checking ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
the power voltage.
▶ When the NG LED turns on, the Power Board
▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A21 (13/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y/`17Y LED 18Pin Power Board Diagnostic method
1 2
▶ Check power board voltage.
▶ Disconnect the Main Board 18Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 18Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board
A21 (14/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y LED(UH95/UH96) Power Board Diagnostic method
1 2
▶ Check power board voltage. ▶ Disconnect the Main Board 28Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 28Pin Power Cable connector ▶ When the OK(24V,12V) LED turns on, Power Board is normal.
to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board
A21 (15/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y/`17Y LED(UH85/UH93) Power Board Diagnostic method
1 2
▶ Check power board voltage. ▶ Disconnect the Main Board 28Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 28Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board
A21 (16/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y/`17Y LED 12Pin Power Board Diagnostic method
1 2
▶ Check power board voltage.
▶ Disconnect the Main Board 12Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 12Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board
A21 (17/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`16Y LED 12Pin Power Board Diagnostic method
1 2
▶ Check power board voltage.
▶ Disconnect the Main Board 12Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3 4
▶ Connect the 12Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board
A21 (18/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
`17Y LED 28Pin Power Board Diagnostic method
1 2
▶ Check power board voltage.
▶ Disconnect the Main Board 28Pin Power Cable connector.
▶ Fix the LCD MODEL switch to 20V.(Smart JIG)
3 4
▶ Connect the 28Pin Power Cable connector ▶ When the OK LED(24V,12V) turns on, Power Board is normal.
to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board
A21 (19/19) can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
