CONFIDENTIAL
LED TV
SERVICE MANUAL
CHASSIS : UA82F
MODEL : 75SK8070PUA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70424720 (1804-REV00)
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
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 UA82F (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 Rear (1EA)
6 Component Input Y/Cb/Cr, Y/ Pb/Pr Rear (1EA)
7 HDMI Input HDMI 1 PC / DTV format Side, Support 6Gbps
HDMI 2 PC / DTV format Side, Support 6Gbps, Support ARC
HDMI 3 PC / DTV format Rear, Support 6Gbps
HDMI 4 PC / DTV format Rear, Support 6Gbps
8 Audio Input Component / AV Audio / DVI Audio L/R Input ; Rear
Component and AV and DVI use same jack ;
9 SPDIF out(1EA) Optical Audio out Rear (1EA),
10 USB Input(3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD
Side(1EA), Rear(1EA)
-6- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
5. External Input Support Format
5.1. Component (Y, PB, PR)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed
1 720*480i 15.73 59.94 13.50 SDTV, DVD 480I(525I)
2 720*480i 15.75 60.00 13.51 SDTV, DVD 480I(525I)
3 720*480p 31.47 59.94 27.00 SDTV 480P
4 720*480p 31.50 60.00 27.02 SDTV 480P
5 1280*720p 44.96 59.94 74.17 HDTV 720P
6 1280*720p 45.00 60.00 74.25 HDTV 720P
7 1920*1080i 33.72 59.94 74.17 HDTV 1080I
8 1920*1080i 33.75 60.00 74.25 HDTV 1080I
9 1920*1080p 67.43 59.94 148.5 HDTV 1080P
10 1920*1080p 67.50 60.00 148.5 HDTV 1080P
5.2. 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
(3) Click [DOWNLOAD AND INSTALL]
(4) TV is updating
(6) After finished the update, below Pop-up appear
(5) After finished the update, below Pop-up appear
(7) Click [Yes] : TV will be DC OFF -> ON
(8) After TV turned on, Check the updated SW Version and
Tool Option
(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.
X_TALX101
24MHz
TU6701
1. Main IC
DDR4 2666 DDR4 2133
512MB IC401 IC501
I2C DDR4 2666 DDR4
512MB2133
R
I2C 5 512MB 512MB
E IC400 IC500
A TS
R
CVBS / SIF EEPROM(NVRA
I2C 4 M)
(256Kb)IC102
eMMC
(4GB)
JK4200 IC8800
Side USB1 (2.0) USB3_0
JK4400
USB2 (2.0) USB2_2
Rear JK4600
USB3 (2.0) USB2_1 Vx1 Interface
- 10 -
Main
JK3101 IC
HDMI1 HDMI 2.0 PHY3_RX0N I2C 0
Side JK3102 I2S MAIN Audio AMP
Copyright ©
BLOCK DIAGRAM
HDMI2(ARC) HDMI 2.0 PHY2_RX0N IC5300
JK3103
HDMI3 HDMI 2.0 PHY1_RX0N
Rear JK3104
HDMI4 HDMI 2.0 PHY0_RX0N
USB_WIFI WIFI/BT Combo
HP Audio Out SUB
IR / KEY ASSY
Rear
Only for training and service purposes.
ST- BY LED
AV AV
OPTIC SPDIF OUT
Sub Micom
X_TAL
Rear ETHERNET (RENESAS
LAN I2C 1 32.768KH
LG Electronics Inc. All rights reserved.
R5F100GEAFB)IC3000
z X3001
+3.3V_NORMAL 2. I2C
+3.3V_NORMAL
Main IC
3.3KΩ
3.3KΩ
IC5300 SCL0 SCL4 IC102
100Ω 33Ω
NTP7518 SDA0 NVRAM
SDA4
33pF
+3.3V_NORMAL
SCL3
3.3KΩ
IC3000 SCL1 SDA3
MICOM 33Ω
SDA1
- 11 -
+3.3V_TU
Copyright ©
1.8KΩ
SCL5
33Ω TUNER
SDA5
Only for training and service purposes.
47pF
LG Electronics Inc. All rights reserved.
USB1 (2.0) 3. Power
IC1100
PANEL USB1 (2.0)
13V
IC1600 / 6A USB2 (2.0)
+5V
V_N
NORMA L
+5V_NORMAL
IC1400 / 3A IC6900 / 2A
1.1V_DEMOD TUNER
+3.3V_NORMAL
NTP7518
NVRAM
+D13V H/P AMP
IC1500 / 3.5A
1.5V_DDR
DDR3
MAX3232CDR IC1501 / 3.5A
1.2V_DDR DDR4
IC1700 / 4A MICOM
+3.5V_ST IC1502 / 1A
2.5V_VPP DDR4
- 12 -
IR_KEY
+3.5V_WO L ETHERNET
WIFI_EN WIFI
Copyright ©
IC1800 / 3A
+0.9V_DDR &C4TX Main IC
IC1800 / 3A IC2300 / 2A Main SOC
+1.8V_IO +0.9V DDR
IC2100 / 3A
Main IC
+0.9V_CPU
Only for training and service purposes.
IC2000 / 12A Main IC
+0.9V_CORE
+A13V
LG Electronics Inc. All rights reserved.
NTP7518 Main
+3.3V_TU 4. Tuner
Tuner
[3.3V_TU] 3 +3.3V_TU
1.2KΩ
Main IC
SCL5
SDA5
[I2C_SCL_5_TU] 1
33 Ω
[I2C_SDA_5_TU] 2
TU_CVBS
[TU_CVBS_TU] 4 CVBS_IN1
IF_AGC
IFAGC
- 13 -
[IF_AGC_TU] 5
TU_SIF
[TU_SIF_TU] 6 AAD_ADC_SIF
IF_N_TU
[IF[N]] 7 DMD_TADC_INN
IF_P_TU
Copyright ©
[IF[P]] 8 DMD_TADC_INP
Only for training and service purposes.
LG Electronics Inc. All rights reserved.
Jack Side SoC Side
JK3401 Main IC
5. Video/Audio
AV1_CVBS_IN_SOC
CVBS_IN2
AV_CVBS_IN / AV_L / AV_R COMP2_Y_IN_SOC
Y1_IN
JK3402
Copyright © - 14 -
Tuner TU_CVBS_TU TU_CVBS
CVBS_IN1
Only for training and service purposes.
TU_SIF_TU, IF_P/ N_TU TU_SIF, IF_P/ N
AAD_ADC_SIF, DMD_ADC_INP, DMD_ADC_INN
FE_DEMOD1/ 2_TS_CLK,SYNC,VAL FE_DEMOD1/ 2_TS_CLK,SYNC,VAL
[ TP0CLK ,VLD,SYNC]
LG Electronics Inc. All rights reserved.
JK3401 SDA0/ GPIO138
SCL0/ GPIO139 I2C_SDA_0_AMP1 / I2C_SCL_0_AMP1
AUAD_R_CH1_IN IC5300 LPF Front_L
DACSCK/ GPIO81 AUD_SCK
AUAD_L_CH2_IN
DACLRCH/ GPIO82 AUD_LRCH Front AMP
LPF Front_R
6. Audio Out
DACLRCK AUD_LRCK NTP7518
AMP_MUTE
GPIO23 AMP_RESET_N
- 15 -
IC3000
MICOM
Copyright ©
Main IC
Tuner
TUNER_SIF
TR BUF AAD_ADC_SIF
SIDE_HP_MUTE
Only for training and service purposes.
SPDIF_OUT 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 7. 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
HDMI3 (SIDE)
HDMI2.0
Main IC
DDC_SCL_2 JK3102
DDC_SCL_2
- 16 -
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) RENESAS
32.768kHz MICOM(IC3000) Q3001
HDMI_CEC_MICO
M
* 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
/USB_OCD2 JK4200 IC4301 +5V_NORMAL
USB_CT
L2
USB2.0
USB2(SIDE)
USB2.0_2_DM1 +5V_USB_2
USB2.0_2_DP1
JK4400 OCP IC1600
/USB_OCD2 +5V_NORMAL
IC4501 5V / 6A
USB_CTL2
USB2.0
USB3(Rear)
+5V_USB_3
8. USB / WIFI / M-REMOTE / UART
USB2.0_3_DM0
USB2.0_3_DP0
/USB_OCD2 JK4600 OCP +5V_NORMAL
USB_CTL2 IC4700
- 17 -
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
Only for training and service purposes.
UART0_RXD/GPIO106 MAX3232CDR
LG Electronics Inc. All rights reserved.
RENESAS MICOM(IC3000)
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.
710
910
400
900
810
120
521
411
HW1
HS1
540
HP1
500
LV2
121
530
570
LV1
820
700
200T
A9
200
A10
AR2
200A
- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ASSEMBLY / DISASSEMBLY GUIDE (SET)
[Disassembly Guide]
(1) L
ay the TV Set on a flat Pad and Remove the Stand Screw 4ea. -> Remove the Stand
: M4*20 4EA Disassemble screw
(2) Remove 1ea Screw of the Power Cord Bracket. -> Remove the Power Cord Bracket
:M4*20 4EA Disassemble screw
:M3*5.5 1EA Disassemble screw Separate the Power Cord Bracket Remove the Power Cord Bracket Assy
- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(3) Remove the B/C Screw 18ea. -> Remove the B/C
(But, Don’t remove 2ea Screw of EGI Bar -> See below photo)
: Don’t Remove 2ea Screw
:M3*5.5 9EA Disassemble screw
:M4*10 5EA Disassemble screw
:M8*10 4EA Disassemble screw
(4) M3*5.5 4ea Disassemble screw
(5) Detach the tape 3ea
(6) Separate connector 1ea -> Remove the Bottom Cover Bracket
(5)
(5)
(6)
(5)
(4) (4) (4) (4)
- 20 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(7) Separate connector 13ea
(8) M3*5.5 8ea Disassemble screw -> Remove the Main and Power PCB Assy
(8) (7) (7) (8)
(8)
(7) (8)
(7)
(7)
(7) (7) (7) (7)
(7)
(8) (8) (8) (8)
(7)
(7) (7)
(9) Remove the Speaker 2ea
b b
a a a a
- 21 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(10) M4*8 4EA Disassemble screw -> Remove the 1Pole Stand Guide Supporter
(11) Detach the Insulation Sheet 1ea
- 22 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
[Assembly Guide]
(1) Attach the Insulation Sheet 1ea
(2) Place the 1Pole Stand Guide Supporter and M4*8 4EA Assemble screw
(1)
(2) (2)
(2) (2)
(3) Assemble the Speaker 2ea. ( a b)
(3) (3)
a a
b b b b
- 23 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(4) M3*5.5 8ea Assemble screw
(5) Attach Connector 13ea
(4) (5) (5) (4)
(4)
(5) (4)
(5)
(5)
(5) (5) (5) (5)
(5)
(4) (4) (4) (4)
(5)
(5) (5)
(6) Attach Connector 1ea
(7) M3*5.5 4ea Assemble screw
(8) Attach the tape 3ea
(8)
(8)
(6)
(8)
(7) (7) (7) (7)
- 24 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(9) Place the B/C on the module and Assemble the B/C Screw 18ea.
:M3*5.5 9EA Disassemble screw
:M4*10 5EA Disassemble screw
:M8*10 4EA Disassemble screw
(10) Attach the Power Cord Bracket and Assemble the screw 1ea.
:M4*20 4EA Disassemble screw
:M3*5.5 1EA Disassemble screw Separate the Power Cord Bracket Remove the Power Cord Bracket Assy
- 25 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(11) Assemble the Stand Assy. (Assemble screw 4ea)
: M4*20 4EA Disassemble screw
- 26 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
DISASSEMBLY GUIDE (MOUBLE)
[ Module Disassemble ]
(1) Disassemble of Cover Shield
Disassemble the Screws
Disassemble the source PCB from the guide
(2) Disassemble of Clip Top Clip Disassembly
Down Clip Disassembly
- 27 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
[CaseTop Disassemble]
(1) LCM reversal (3) CaseTop Left / Right Breakdown
Dismantle the back hook and disassemble the left / right
side.
- CaseTop opens left / right. (Minimizing widening)
Gap maintain(below 20mm)
(4) Case Top Up disassemble
Disassemble the top of the back hook.
- Grab the corner when proceeding to disassemble the
upper part
(2) Disassemble and dismantle rear holder
Gap 유지(20mm 이하)
Gap maintain(below 20mm)
Screw
Holder C/Top
- 28 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(5) LCM reversal
- When reversing, hold the panel so that it does not fall off.
(6) C/Top Down
- CaseTop Down after removing Screw Separate from LCM
- 29 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
[BLU Disassemble]
(1) Panel and Guide Panel disassembly (using adsorber)
(2) Remove Guide Panel by unhooking Guide Panel Hook
(3) Removal of Sheets
(4) Removal of LGP
LED
- 30 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(5) Removal of ReflectorRemoval of Reflector
LED
(6) Removal of LED Housing Assy
- 31 - 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,
5 5
light spot, external device color error
6 No power 6
B. Power error Off when on, off while viewing, power
7 7-8
auto 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 MR18 operating checking 12
D. Function error
12 Wifi operating checking 13
14 External device recognition error 14
15 E. Noise Circuit noise, mechanical noise 15
16 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, LVDS or EPI Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A18
No video Normal Y Check Back Light Y Check Power Y Replace T-con/Main
On Normal
Normal audio audio On with naked eye Board Board or module
voltage
20/13.2V etc.
N N N
Move to No Check Power Board 84V ~ 104V output Repair Power
☞A18
video/No audio Board or parts
Normal Y Replace Inverter
voltage or module
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
☞A18
No Video/ Check various Check and
Y
No audio voltages of Power Normal
replace
Board (20/13.2V…) 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 ( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Check whether other equipments have problem or not.
Normal Y
(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
Normal N Contact with signal distributor
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
-AV
Color Link Cable Color
Replace Main B/D
Color Y Replace module
error? (EPI or Vx1 error? error?
-HDMI
Cable) and
N contact N N
condition
Check error End
color input
mode
☞A8 Check
External Input/ External device Y
external
Check Test pattern Component /Cable Replace Main/T-con B/D
device and
error normal
cable
N
Request repair
for external
device/cable
N
Check external External device Y
HDMI device and /Cable Replace Main/T-con 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
Check and
-External Input Screen Y external
Y Screen N Screen
-HDMI Normal? replace Link Replace Main/T-con B/D
normal? device normal? normal?
Cable
connection
condition N For LGD panel Y
N Y
Replace Main B/D
Replace Request repair End End
module for external
☞A8 device
Check Test pattern
For other panel
External device screen error-Color error
Check screen
Check S/W Version Check N condition by input External
-External Input Input Connect other external
version
-Component error device and cable Screen N Replace
-HDMI/DVI (Check normal operation of normal? Main/T-con
Y External Input, Component, B/D
Component RGB and HDMI/DVI by
Y
S/W Upgrade error connecting Jig, pattern
Generator ,Set-top Box etc.
Request repair for
external device
Y
Connect other external
Normal N HDMI/
device and cable N
screen? DVI
(Check normal operation of Screen Replace
External Input, Component, normal? Main /T-con
Y RGB and HDMI/DVI by B/D
connecting Jig, pattern
Generator ,Set-top Box etc.
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
☞A17 ☞A18
DC Power on Replace
Check Power LED Y Normal N Check Power Y
by pressing Power Key OK? Power
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
☞A18
N Measure voltage of each output of Power B/D
Normal?
Y Y Y
Normal
Replace Main B/D
voltage?
Normal
Close Check ST-BY 3.5V Y
voltage? N
☞A18 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
N Y
Check A/C cord Error? CPU
Replace Main B/D Normal? End
Abnormal
N
Check for all 3- phase
power out Y Abnormal Replace Power B/D
1
Fix A/C cord & Outlet
and check each 3
phase out
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
☞A20 ☞A21+A18
No audio
Check user N Check audio 20V
Normal Y
menu > Off of Power Board
Screen normal voltage
Speaker off
Y N
Cancel OFF Replace Power Board and repair parts
Check N
Disconnection Replace MAIN Board End
Speaker
disconnection
Y
Replace 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/
☞A21+A18
Check and replace
Discontinuation/ Check audio
speaker and
Noise for B+ Voltage (20V)
connector
Check input all audio
signal Y
Signal
-RF
normal? Wrecked audio/ Y
-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
☞A22 ☞A22 ☞A22
Check & Repair N Y Y
Check R/C itself Normal Y Normal Check B+3.5V Normal Check IR Normal
operating? Cable connection operating? Voltage? Signal?
Operation On Main B/D Output signal
Connector solder
N
Y N N
☞A18
Check R/C Operating Check & Replace Close Check 3.5v on Power B/D Repair/Replace
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
Check the RF Receiver ver N Check MR18 Normal Y Turn off/on the
Press the Is show ok N
INSTART menu is “00.00”? itself Operation operating? set and press
wheel message?
the wheel
N
Y
Y
☞A23
Check & Replace Close
Check & Repair Battery of MR18
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
* If you conduct the loop at 3times, change the M4.
* INSTART MENU14.RF
Remocon Test3. Firmware
download
12
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
D. Function error Established
Error date
symptom
Wifi operating checking Revised date 13/16
3.Wifi operating error
☞A4 ☞A24
Check the Wi-Fi Mac value N Check the Wifi wafer Normal Replace
N
INSTART menu is “NG”? 1pin Voltage? Main B/D
Y
☞A24 Y
Close
Check & Repair
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 External Input and
Signal information Technical N
input Component 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
nose location of Replace PSU
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 A. Video error_ No video/Normal Check LCD back light with naked eye A1
2 audio 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 (Vx1/EPI) reconnection
7 A. Video error_ Color error A7
condition
A-1/11
9 Check Cable (1) ~ (2)
A-2/11
A-3/11 ~
10 Exchange Main Board (1) ~ (3)
A-5/11
Defected Type caused by T-Con/ A-6/11 ~
11 Exchange Module (1) ~ (3)
Inverter/ Module A-8/11
A-9/11 ~
12 Exchange T-Con (1) ~ (2)
A-10/11
13 Exchange Power Board(PSU) A-11/11
Continue to the next page
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
14 Check front display LED A17
15 B. Power error_ No power Check power input Voltage & ST-BY 3.5V A18
16
B. Power error_Off when on, off
17 POWER OFF MODE checking method A20
while viewing
Checking method in menu when there is no
18 A21
C. Audio error_ No audio/Normal audio
video Voltage and speaker checking method when
19 A22
there is no audio
20 Remote control operation checking method A23
D. Function error
21 Motion Remote operation checking method A24
22 How to use the Service remote control A25-A27
23 Check items after Main B/D replacement A28
E. Etc
24 Adjustment Test pattern – ADJ Key A29
How to use JIG
25 A30
(Power B/D Diganostic 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 Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check LCD back light with naked eye A1
date
After turning on the power and disassembling the case, check with the naked eye,
whether you can see light from locations.
A1
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check White Balance value A2
date
Entry method
1. Press the ADJ button on the remote control for adjustment.
2. Enter into White Balance.
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 Established
symptom A. Video error_Video error, video lag/stop date
TUNER input signal strength checking method Revised
Content date A3
Advanced 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 Established
symptom A. Video error_Video error, video lag/stop date
Version checking method Revised
Content date A4
1. Checking method for remote control for adjustment
Version
v
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
symptom
A. Video error_Video error, video lag/stop
date
Revised
Content TUNER checking 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 A. Video error _Vertical/Horizontal bar, Established
symptom residual image, light spot date
Revised
Content connection diagram (1) 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 Established
symptom A. Video error_Color error date
Revised
Content Check Link Cable(Vx1) reconnection condition date 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 - 1/11
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 - 2/11
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 - 3/11
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 - 4/11
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 - 5/11
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
Isometric Isometric horizontal bars occur
MODULE
Horizontal Bar throughout the screen
MODULE Internal matter BLU internal foreign matter inflow
MODULE Image broken 6 block image broken
MODULE Image broken Screen sync signal broken
A - 6/11
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
Internal damage and image breakage
MODULE Image broken
due to external impact
Bend on the Bending due to lateral external impact
MODULE
screen and internal bending of BLU
Vertical spreading on cube screen in no
MODULE Vertical smear
signal
MODULE Over color Screen contour part brightly Over color
A - 7/11
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 Center Vertical Bar
MODULE Screen darkness Center of the screen 1 block dark
MODULE Vertical bar Center Vertical Bar
Darkness at the
MODULE bottom of the MODULE internal BLU breakage
screen
A - 8/11
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(T-Con) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
A - 9/11
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(T-Con) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
T-CON Wafer Locking The strength is
T-CON Image Broken
weak and cable contact failure occurs
Darkness at the Initial normal operation,
T-CON
top of the screen upper darkness during heat run
The entire screen is dark and bit noise
T-CON Image Broken
occurs
The entire screen is dark and bit noise
T-CON Image Broken
occurs
A - 10/11
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
symptom B. Power error _No power date
Revised
Content Check front Power Indicator date A17
ST-BY condition: On or Off
Power ON condition: Turn Off
A17
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom
B. Power error _No power
date
Revised
Content Check power input voltage and ST-BY 7.8V A18
date
SET Model Power P/N, Name
75SK80 EAY64788701, FREE LGP75-18UL12
Power Check Sequence
1. AC input Check : SK101 (100~240Vac) P201
2. PWR-ON Check :P201
: 13,2V (12.54 ~ 13.86V)
20V ( 18~22V)
3, LED+ DC Check
- 94.1V(84.69V ~ 103.51V)
SK100 (AC input)
A18
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error
symptom B. Power error _Off when on, off whiling viewing Established
date
Revised
Content POWER OFF MODE checking method date A20
Entry method
1. Press the IN-START button of the remote
control for adjustment
2. Check the entry into adjustment item 3
A20
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom C. Audio error_No audio/Normal video
date
Revised
Content Checking method in menu when there is no audio date A21
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
A21
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom C. Audio error_No audio/Normal video date
Voltage and speaker checking method Revised
Content date A22
when there is no audio
①
②
③
1 SPK_R-FT
2 SPK_R+FT
Checking order when there is no audio 3 SPK_L-FT
4 SPK_L+FT
1.Check the contact condition of or 20V connector of Main Board
2. Measure the 20V input voltage supplied from Power Board
(If there is no input voltage, remove and check the connector)
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.
A22
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content Remote control operation checking method date A23
Pin Pin name
1 VCC
① 2 USB_DM
IR & EYE Sensor 3 USB_DP
4 GND
5 WOL/WIFI_ON
6 VCC
7 COMBO_RESET
8 GND
9 BT_WAKEUP_DEVICE
10 BT_WAKEUP_HOST
IR & LOGO light Rear 11 GND
12 GND
13
14
15
16 EYE_SDA
IR LED Eye ③ 17 EYE_SCL
18 GND
② 19 IR
20 LED_R
21 GND
Checking order to check remote control 22 VCC
23 KEY2
24 KEY1
Checking order
25 GND
1.Check IR cable condition between IR & Main board.( Check picture number① and ②)
2.Check the standby 3.5V on the terminal 16 pin (③)
3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester
needle should move slowly, otherwise, it’s defective.
A23
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content Remote control operation checking method date A24
Pin Pin name
1 +3.5V_WIFI
2 WIFI_DM_JACK
① Wifi & BT Front
3 WIFI_DP_JACK
4
5 WOL/WIFI_POWER_ON_JACK
6 +3.5V_WIFI
7 COMBO_RESET_JACK
8
9 BT_WAKEUP_DEVICE_JACK
10 BT_WAKEUP_HOST_JACK
11
Wifi & BT Rear 12
13
14
15
16 EYE_SDA_JACK
17 EYE_SCL_JACK
18
③ 19 IR_JACK
20 LED_R_JACK
② 21
22 +3.5V_ST
Checking order to check motion remote/wifi 23 KEY2_JACK
24 KEY1_JACK
Checking order 25
1.Check BT/Wifi cable condition between BT/Wifi assy & Main board.
2.Check the 3.5V on the terminal 22
A24
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content How to use the Service remote control date A25
1. How to access the remote control
0 4 1 3
0 4 1 3
A25
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content How to use the Service remote control date A26
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)
A26
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content How to use the Service remote control date A27
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
A27
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content Check items after Main B/D replacement date A28
Check items afer Main B/D(Model Number D/L, White Balance)
1. Press the Service remote control instart Key.
No.7 Select Model Number D/L
- Key in the model name and serial number
after checking the ID label on the back cover.
2. Press the Service remote control ADJ Key.
No.13 Select White Balance
- Record the R, G, B (GAIN, Cut) value of the
color temperature before main board
replacement.
A14 After replacing the main board, key in the
recorded value.
A28
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom
A. Video error_Color error
date
Adjustment Test pattern - ADJ Key Revised
Content date A29
You can view 6 types of patterns using the ADJ 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!)
A29
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)
A30
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Power Board Muitl Gender JIG Diagram (P/N: RAD33187801)
15Y 16Y 15Y
(LF/UF Series) (OLED B6) (OLED)
28Pin 24Pin 24Pin 24Pin NC
18 Marking check 24Pin
18Pin 16Y
New JIG (OLED)
24Pin
13Y/14Y 28Pin
No Marking
OLD JIG
17/18Y
W7 17Y/18Y
B8 (OLED)
24Pin 12Y C8
E8 24Pin
18Y
G8
32LK61/32LK62
W8
43/49LK61
18Y
18Y
UK63/UK64
SK80/UK89
UK65/UK7050
SK85/SK96
SK95/SK99 16Y/17Y/18Y
18Pin (UH/UJ/UK
18Y SK)
24 Marking Check 28Pin UK74
28Pin 12Pin 12Pin 28Pin
UK75
Cable Connection UK77
Includes 49UJ63 UK78
17Y/18Y 16/18Y 16Y/17Y/18Y 16Y/17Y 16Y SK79
(SJ/UJ/UK/SK) (UH/UK) (LH/LJ/LK) (UH/SJ) (UH)
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/18Y OLED, 16/17/18 Y LED model Power diagnosis function newly added
<15Y/16Y/17Y/18Y OLED Model, 16Y/17Y/18Y LED Model>
Year Product Model
EG92/EG93/EG94
‘15 OLED EG96
EF95
B6, C6
OLED
E6, G6
UH95/UH96
‘16 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
SK80/SK85/SK95
UK78/UK75/UK77/SK79
‘18 LED
UK63/UK64/UK65/UK7050
32LK61/62, 43/49LK61
B8, C8, E8
‘18 OLED
G8, W8
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.
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
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
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.
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.
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
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
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
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)
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)
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
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
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
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
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
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
can be judged as defective.
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
