CONFIDENTIAL
LED TV
SERVICE MANUAL
CHASSIS : UD71M
MODEL : 65SJ950V 65SJ950V-ZA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69980002 (1708-REV01)
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONTENTS
CONTENTS ............................................................................................... 2
SAFETY PRECAUTIONS ......................................................................... 3
SERVICING PRECAUTIONS..................................................................... 4
SPECIFICATION........................................................................................ 6
SOFTWARE UPDATE ............................................................................. 10
BLOCK DIAGRAM................................................................................... 11
EXPLODED VIEW ................................................................................... 18
DISASSEMBLY GUIDE .......................................................................... 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
on page 3 of this publication, always follow the safety precau- ES devices.
tions. Remember: Safety First. 4. Use only an anti-static type solder removal device. Some sol-
der 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 6. Do not remove a replacement ES device from its protective
module or any other receiver assembly. package until immediately before you are ready to install it.
b. Disconnecting or reconnecting any receiver electrical plug (Most replacement ES devices are packaged with leads elec-
or other electrical connection. trically 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 mate-
installation of electrolytic capacitors may result in an explo- rial to the chassis or circuit assembly into which the device will
sion hazard. be installed.
2. Test high voltage only by measuring it with an appropriate high CAUTION: Be sure no power is applied to the chassis or cir-
voltage meter or other voltage measuring device (DVM, FET- cuit, and observe all other safety precautions.
VOM, 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 appropri-
(by volume) isopropyl alcohol (90 % - 99 % strength) ate tip size and shape that will maintain tip temperature within
CAUTION: This is a flammable mixture. the range or 500 °F to 600 °F.
Unless specified otherwise in this service manual, lubrication 2. Use an appropriate gauge of RMA resin-core solder composed
of 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 Do not use freon-propelled spray-on cleaners.
are 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
ily by static electricity. Such components commonly are called against 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 discharg-
ing wrist strap device, which should be removed to prevent
potential 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 when-
gently prying up on the lead with the soldering iron tip as the ever 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 remain- good copper pattern. Solder the overlapped area and clip off
ing 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 UD71M (1) Performance: LGE TV test method followed
chassis. (2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC specification
- Wireless : Wireless HD Specification (Option)
2. Requirement for Test
Each part is tested as below without special notice.
(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °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 20 minutes prior
to the adjustment.
4. Model General Specification
No. Item Specification Remarks
DTV & Analog (Total 37 countries)
DTV (MPEG2/4, DVB-T) : 26 countrie
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria,
France, Spain, Belgium, Luxemburg, Greece, Czech, Turkey, Morocco,
Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, Albania,
Bosnia, Slovakia, Belarus
DTV (MPEG2/4, DVB-T2) :11 countries
UK(Ireland), Sweden, Denmark, Finland, Norway, Ukraine, Kazakhstan,
Russia, Italy, Croatia, Serbia
DTV (MPEG2/4, DVB-C) : 37 countries
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria,
France, Spain, Italy, Belgium, Russia, Luxemburg, Greece, Czech, Croa-
tia, Turkey, Morocco, Ireland, Latvia, Estonia, Lithuania, Poland, Portu-
gal, Romania, Albania, Bosnia, Serbia, Slovakia, Belarus, UK, Sweden,
Denmark, Finland, Norway, Ukraine, Kazakhstan
EU(PAL Market-36Countries)/CIS
1 Market
+ Morocoo(Africa)
DTV (MPEG2/4,DVB-S) : 37 countries
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria,
France, Spain,Belgium, Luxemburg, Greece, Czech, Turkey, Morocco,
Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, Albania,
Bosnia, Slovakia, Belarus, UK(Ireland), Sweden, Denmark, Finland, Nor-
way, Ukraine, Kazakhstan,Russia, Italy, Croatia, Serbia
Supported satellite : 35 satellites
ABS1 75.0E, AMOS 4.0W, ASIASAT3S 105.5E, ASTRA 19.2E, ASTRA
23.5E, ASTRA 28.2E, ASTRA 4.8E, ATLANTIC BIRD2 8.0W, ATLANTIC
BIRD3 5.0W, BADR 26.0E, DIRECTV-1R 56.0E, EUROBIRD 9A 9.0E,
EUROBIRD3 33.0E, EUTELSAT 36 A/B 36.0E,EUTELSAT W2A 10.0E,
EUTELSAT W3A 7.0E, EUTELSAT7WA 7.3WEUTELSAT 16.0E, EX-
PRESS AM1 40.0E, EXPRESS AM3 140.0E, EXPRESS AM33 96.5E,
HELLASSAT 39.0E, HISPASAT 1CDE 30.0WHOTBIRD 13.0E, INTEL-
SAT10&7 68.5E, INTELSAT15 85.2E, INTELSAT1R 50.0W, INTEL-
SAT903 33.5W, INTELSAT904 60.0E, NILESAT 7.0W, NSS12 57.0E,
THOR 0.8W, TURKSAT 42.0E,YAMAL201 90.0E, OTHER
-6- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
No. Item Specification Remarks
(1) Digital TV
- DVB-T
- DVB-T2*
- DVB-C
2 Broadcasting system *:Depending on country
- DVB-S/S2*
(2) Analogue TV
- PAL/SECAM B/G/I/D/K
- SECAM L
(1) Digital TV
1) DVB-T/T2
- VHF III : 174~230MHz
- UHF IV : 470~606MHz
- UHF V : 606~862MHz
- S Band II : 230~300MHz
3 Channel coverage - S Band III : 300 ~470MHz
2) DVB-C
- 46 ~ 890MHz
3) DVB-S/S2
- 950~2150MHz
(2) Analogue TV
- 46~862MHz
▶ DVB-T
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32
- Modulation : Code Rate
QPSK : 1/2, 2/3, 3/4, 5/6, 7/8
16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
▶ DVB-T2 (Model : *L*V*-Z* (T2 only Model))
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,
- Modulation : Code Rate
QPSK : 1/2, 2/5, 2/3, 3/4, 5/6
16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
Analog : Upper Heterodyne
4 Receiving system 64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
Digital : COFDM, QAM
256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
▶ DVB-C
- Symbolrate :
4.0Msymbols/s to 7.2Msymbols/s
- Modulation :
16QAM, 64-QAM, 128-QAM and 256-QAM
▶ DVB-S/S2
- symbolrate
DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s
DVB-S (QPSK) : 2 ~ 45Msymbol/s
- viterbi
DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8
DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10
Antenna,
5 Head phone out HDMI1, HDMI2, HDMI3, HDMI4, USB1,
USB2, USB3
6 HDMI Input (4EA) HDMI1, HDMI2, HDMI3, HDMI4
7 SPDIF out (1EA) SPDIF out
8 USB (3EA) EMF, For SVC (download)
9 Ethernet Connect(1EA) Ethernet Connect STP cable.
10 PCMCIA Card slot (1EA) PCMCIA slot
-7- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
5. External Input Format
5.1. 2D Mode
(1) HDMI Input (DTV)
No. Resolution H-freq(kHz) V-freq(kHz) Pixel clock(MHz) Proposed Remarks
1 640*480 31.469 59.94 25.125 SDTV 480P
2 640*480 31.5 60.00 25.125 SDTV 480P
3 720*480 15.73 59.94 13.500 SDTV 576P
4 720*480 15.75 60.00 13.514 HDTV 720P Spec. out but display
5 720*576 15.625 50.00 13.500 HDTV 720P
6 720*480 31.47 59.94 27.00 HDTV 720P
7 720*480 31.5 60.00 27.027 HDTV 1080I
8 720*576 31.25 50.00 27.00 HDTV 1080I
9 1280*720 44.96 59.94 74.176 HDTV 1080I
10 1280*720 45.00 60.00 74.25 HDTV 1080P
11 1280*720 37.50 50.00 74.25 HDTV 1080P
12 1920*1080 28.125 50.00 74.25 HDTV 1080P
13 1920*1080 33.72 59.94 74.176 HDTV 1080P
14 1920*1080 33.75 60.00 74.25 HDTV 1080P
15 1920*1080 26.97 23.976 63.296 HDTV 1080P
16 1920*1080 27.00 24.000 63.36 HDTV 1080P
17 1920*1080 33.71 29.97 79.120 UDTV 2160P
18 1920*1080 33.75 30.00 79.20 UDTV 2160P
19 1920*1080 56.25 50.00 148.50 UDTV 2160P
20 1920*1080 67.432 59.94 148.350 UDTV 2160P
21 1920*1080 67.50 60.00 148.50 UDTV 2160P
22 1920*1080 135.00 120.00 297.00 UDTV 2160P(DVB)
23 1920*1080 135.00 119.88 296.703 UDTV 2160P
24 1920*1080 112.5 100.00 297.00 UDTV 2160P
25 3840*2160 53.95 23.98 296.703 UDTV 2160P
26 3840*2160 54.00 24.00 297.00 UDTV 2160P
27 3840*2160 56.25 25.00 297.00 UDTV 2160P
28 3840*2160 61.43 29.97 296.703 UDTV 2160P
29 3840*2160 67.50 30.00 297.00 UDTV 2160P
When HDMI1,2,3
30 3840*2160 112.50 50.00 594.00 UDTV 2160P(DVB)
UHD DEEP COLOUR ON
When HDMI1,2,3
31 3840*2160 134.865 59.94 593.407 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI1,2,3,4
32 3840*2160 135.00 60.00 594.00 UDTV 2160P
UHD DEEP COLOUR ON
33 4096*2160 53.95 23.98 296.703 UDTV 2160P
34 4096*2160 54.00 24.00 297.00 UDTV 2160P
35 4096*2160 56.25 25.00 297.00 UDTV 2160P
36 4096*2160 61.43 29.97 296.703 UDTV 2160P
37 4096*2160 67.50 30.00 297.00 UDTV 2160P
-8- 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 Remarks
When HDMI1,2,3,4
38 4096*2160 112.50 50.00 594.00 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI1,2,3,4
39 4096*2160 134.865 59.94 593.407 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI1,2,3,4
40 4096*2160 135.00 60.00 594.00 UDTV 2160P
UHD DEEP COLOUR ON
(4) HDMI Input (PC)
No. Resolution H-freq(kHz) V-freq(kHz) Pixel clock(MHz) Proposed Remarks
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 40.00 VESA(SVGA)
5 1024*768 48.36 60.00 65.00 VESA(XGA)
6 1360*768 47.71 60.01 84.75 VESA(WXGA)
7 1152*864 54.34 60.05 80.00 VESA
8 1280*1024 63.98 60.02 109.00 SXGA Support to HDMI-PC
9 1920*1080 67.50 60.00 158.40 WUXGA(Reduced Blanking)
10 3840*2160 54.00 24.00 297.00 UDTV 2160P
11 3840*2160 56.25 25.00 297.00 UDTV 2160P
12 3840*2160 67.50 30.00 297.00 UDTV 2160P
13 4096*2160 53.95 23.97 296.70 UDTV 2160P
14 4096*2160 54.00 24.00 297.00 UDTV 2160P
-9- 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. (1) Menu -> All Settings -> General -> About This TV
(2) Automatically detect the SW Version and show the below
message
(2) C lick [CHEK FOR UPDATES] : system check newest
(3) Click [YES]: initiate the download and install of the update. version
(4) Click [Check Now]: move to “About This TV” page for (3) Click [DOWNLOAD AND INSTALL]
update. (4) TV is updating
(5) TV is updating.
(5) After finished the update, below Pop-up appear
(6) After finished the update, below Pop-up appear.
(6) Turn OFF the TV and On. Check the updated SW Version
and Tool Option
(7) Click [Yes] : TV will be DC OFF -> ON
(8) After TV turned on, Check the updated SW Version and
Tool Option.
- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
X_TAL DDR3 2133 X 16
24MHz (512MB X 2EA)
Tuner
Tuner : I2C 5 IF (+/-)
R DDR3 2133 X 16
E (512MB X 2EA)
D-Demod : I2C 2 P_TS
A
R
CVBS/SIF
(H) SYSTEM EEPROM
(256Kb)
1. SOC Block Diagram
USB1 (3.0) OCP MainSOC eMMC
S 1.5A (4GB)
I
HDMI1 (2.0)
D
E HDMI2 (2.0)
(ARC)
OCP
USB2 (2.0) 1.5A
OCP
USB3 (2.0) 1.5A I2S Out
Audio 2 AMP
HDMI3 (2.0)
- 11 -
HDMI4 (2.0)
R
E BLUTOOTH
A HP
R H/P WIFI
AMP
BLOCK DIAGRAM
Copyright ©
AV SUB
ASSY
COMP IR / KEY/EYE
Component/AV Spec. out In Europe IR
Component Spec Out In North America OPTIC SPDIF OUT I2C
KEY
LAN
Sub Micom
Only for training and service purposes.
X_TAL
32.768kHz
LG Electronics Inc. All rights reserved.
TUNER +3.3V_TUNER
CI Slot
2. Tuner + CI
[+3.3V_LNA_TU] 3 +1.2V_Demod_Core
PCM_5V_CTL CI 5V +5V_CI_ON
[+3.3V_TUNER] 11 VCC
Power detect
+3.3V_TUNER
MAIN
+5V_CI_ON +3.3V_NORMAL
[D_Demod_Core] 13 SOC
1.2Kȳ C25 [CAM_VCCEN_N]
[I2C_SCL5_TU] 1 I2C_SCL5 10K ȳ 47K ȳ
33 ȳ AH25[SCL5] C23[CAM_CD1_N] /CI_CD1,2
[I2C_SDA5_TU] 2 I2C_SDA5 AH26[SDA5] B23[CAM_CD2_N] /CI_CD1,2
G28[TPI_VAL]
CI_TS_VAL CI_TS_VAL
[FE_DEMOD1_TS_ERROR_TU] 14 FE_DEMOD1_TS_ERROR
/PCM_CE1.2
[FE_DEMOD1_1_TS_CLK] 15 AC29 [TP_DVB_CLK] B25[CAM_CE1_N] /PCM_CE1.2
FE_DEMOD1_TS_CLK AC30 [TP_DVB_SOP] B26[CAM_CE2_N]
[FE_DEMOD1_TS_SYNC] 16
[FE_DEMOD1_TS_VAL] 17 FE_DEMOD1_TS_SYNC AB30 [TP_DVB_VAL]
FE_DEMOD1_TS_VAL /PCM_IOWR
B29 [EB_BE_N1] /PCM_IOWR
E28 [EB_EB_N0]
/PCM_IORD
/PCM_IORD
CI_ADDR[0-14]
- 12 -
FE_DEMOD1_TS_DATA[0] 18 [EB_ADDR_0~14] CI_ADDR[0-14]
AB28 [TP_DVB_DATA0]
FE_DEMOD1_TS_DATA[1] 19
AC28 [TP_DVB_DATA1] CI_TS_DATA[0-7]
FE_DEMOD1_TS_DATA[2] 20
FE_DEMOD1_TS_DATA [0-7] AD28 [TP_DVB_DATA2] [EB_DATA_0~7] CI_DAT[0-7]
FE_DEMOD1_TS_DATA[3] 21
AD29 [TP_DVB_DATA3]
FE_DEMOD1_TS_DATA[4] 22
AE29 [TP_DVB_DATA4] PCM_RESET
FE_DEMOD1_TS_DATA[5] 23 A24[CAM_RESET] PCM_RESET
AE30 [TP_DVB_DATA5]
FE_DEMOD1_TS_DATA[6] 24 /PCM_WAIT
AF29 [TP_DVB_DATA6] C24[CAM_WAIT_N] /PCM_WAIT
FE_DEMOD1_TS_DATA[7] 25
AF30 [TP_DVB_DATA7]
Copyright ©
PCM_INPACK
PCM_INPACK
A25[CAM_REG_N]
/PCM_REG /PCM_REG
/PCM_IRQA /PCM_IRQA
/TU_RESET1 B24[CAM_IREQ_N]
[/TU_RESET1_TU] 10 AK14 [GPIO26] /PCM_OE
A32 [EB_OE_N] /PCM_OE
/PCM_WE
D28 [EB_WE_N] /PCM_WE
IF_P ADC_I_INP
[IF_P] 7 AN31 [DMD_ADC_INP] CI_IN_TS_CLK
FILTER P30 [TPO_CLK] CI_IN_TS_CLK
IF_N ADC_I_INN CI_IN_TS_VAL
[IF_N] 8 AN32 [DMD_ADC_INN]
P29 [TPO_VAL] CI_IN_TS_VAL
CI_IN_TS_SYNC
N29 [TPO_SOP] CI_IN_TS_SYNC
Only for training and service purposes.
TPI_DATA [0-7] CI_TS_DATA[0-7]
IF_AGC [TPI_DATA 0~7] 100 ȳ CI_TS_DATA[0~7]
[IF_AGC_TU] 5 AL31[IF_AGC]
TPO_DATA[0-7] CI_IN_TS_DATA[0-7]
[TPO_DATA[ 0~7] 33 ȳ CI_IN_TS_DATA[0-7]
LG Electronics Inc. All rights reserved.
A 1
AV
AV1 Jack Side SOC Side
ACK
Phone JACK MAIN SOC
AV_CVBS_IN AV1_CVBS_IN_SOC
AM24 [CVBS_IN2]
Component/AV Spec. out In Europe
Component Spec Out In North America
AL18 [AUAD_L_CH2_IN
COMP2/AV_L_IN AUAD_L_CH2_IN AM18 [AUAD_R_CH2_IN]
COMP2/AV_R_IN AUAD_R_CH2_IN
Component 1
Phone JACK COMP2_SOG2_IN_SOC
COMP2_Y_IN_SOC AM20 [SOY1_IN]
AN20 [Y1_IN]
3. Video & Audio IN/OUT
COMP2_Pb_IN_SOC
COMP2_Pb AL21 [PB1_IN]
COMP2_Pr_IN_SOC
COMP2_Y AM22 [PR1_IN]
COMP2_Pr
Front Speaker
Audio [SCK]
AMP [LRCK] I2S
[DACLRCH]
NTP7515
[I2C_SCL_0/SDA_0]
- 13 -
AMP_RESET
[GPIO23]
Woofer Speaker
Audio
AMP
NTP7515
Copyright ©
AMP_MUTE MICOM
(WOOFER_MUTE)
SPDIF OUT
SPDIF_OUT
AM14 [IEC958OUT]
ARC OUT
(HDMI2) SPDIF_OUT_ARC
Only for training and service purposes.
[PHY0_ARC_OUT]
H/P JACK HP_LOUT_JACK
HP_ROUT_JACK HP AMP AL15 [AUDA_OUTL]
TPA6138 AM15 [AUDA_OUTR]
LG Electronics Inc. All rights reserved.
MICOM MAIN SOC 4. HDMI 2.0
CEC_REMOTE
+5V
Port_1
HDMI 1 [HDMI2_3_SDA]
DDC_I2C_1 HDMI2.0 HDCP1.4
(2.0)_V [HDMI2_3_SCL]
LGE PHY HDCP2.2
HDMI_HPD_1
[HDMI2_3_HPD]
CEC_REMOTE
+5V
HDMI 2 Port_2
[HDMI2_2_SDA]
(2.0)_V DDC_I2C_2 HDMI2.0 HDCP1.4
[HDMI2_2_SCL]
ARC LGE PHY HDCP2.2
HDMI_HPD_2
[HDMI2_2_HPD]
SPDIF_OUT_ARC
- 14 -
CEC_REMOTE
+5V
Port_3
HDMI 3 [HDMI2_1_SDA]
DDC_I2C_3 HDMI2.0 HDCP1.4
(2.0)_H [HDMI2_1_SCL]
LGE PHY HDCP2.2
HDMI_HPD_3
[HDMI2_1_HPD]
Copyright ©
SPDIF_OUT_ARC
[PHY0_ARC_OUT]
CEC_REMOTE
+5V
Port_4
HDMI 4 [HDMI2_0_SDA]
(2.0)_H DDC_I2C_4 HDMI2.0 HDCP1.4
[HDMI2_0_SCL]
LGE PHY HDCP 2.2
HDMI_HPD_4
[HDMI2_0_HPD]
Only for training and service purposes.
LG Electronics Inc. All rights reserved.
MAN SOC
USB3.0_1_TX_DP0 / DM0
[USB3_0_DP0 / DM0] USB3.0_1_RX_DP0 / DM0
[USB3_0_TX0_P / M] USB3.0_1_DP0 / DM0 +5V_USB_1 USB 1
[USB3_0_RX0_P / M] (3.0)_V
USB_CTL1
[GPIO90] OCP
USB2.0_2_DP1 / DM1 +5V_USB_2 USB 2
[USB2_1_DP0 / DM0]
USB_CTL2 (2.0)_H
[GPIO95] OCP
USB2.0_3_DP0 / DM0 +5V_USB_3
[USB2_0_DP0 / DM0] USB 3
USB_CTL3 (2.0)_H
[GPIO34] OCP
5. USB / Wi-Fi / M-Remote / UART
WIFI_DP / DM IR + Wi-Fi /BT
[USB2_2_DP0 / DM0] Wafer 25P
- 15 -
+3.5V_WIFI
WIFI_EN
MICOM
WOL/WIFI_POWER_ON
Copyright ©
SOC_RX/TX
SOC_RX/TX UART wafer
[UART0_RXD/GPIO106] (*) US model only
SOC_RX/TX
RS232 IC
Only for training and service purposes.
[UART0_TXD/GPIO105]
JK6200
UART1_RX/TX RS232C phone Jack
[UART1_RXD / TXD] Debug Wafer
LG Electronics Inc. All rights reserved.
Cap Ready
6. I2C Map
MAIN SOC
+3.3V_NORMAL
AUDIO AMP 100 ˟
33pF +3.3V_TU
ZUZr˟
I2C_SCL0: AK23[SCL0] ZZ˟ LNB
AUDIO AMP 100 ˟
I2C_SDA0: AJ23[SDA0] YU^r˟
33pF
I2C_SCL3: AH24[SCL3] ZZ˟ TUNER (Demod)
+3.3V_NORMAL I2C_SDA3: AJ24[SDA3]
18pF
ZUZr˟
+3.3V_NORMAL
I2C_SCL1: AK22[SCL1]
- 16 -
MICOM
I2C_SDA1: AJ22[SDA1]
ZUZr˟
EYE_I2C_SDA ZUZr˟ +3.5V_ST
EYE_I2C_SCL XWW˟ +3.3V_NORMAL I2C_SCL4: AJ21[SCL4]
ZZ˟ NVRAM
I2C_SDA4: AH21[SDA4]
Copyright ©
IR / KEY/EYE
+3.3V_TU
ZUZr˟
I2C_SCL2: AH23[SCL2]
PMIC (EPI) 33 ˟ XUYr˟GOl|P
I2C_SDA2: AH22[SDA2]
WAFER (Vx1)
I2C_SCL5: AH25[SCL5]
ZZ˟
Only for training and service purposes.
I2C_SDA5: AH26[SDA5] Tuner
47pF
LG Electronics Inc. All rights reserved.
PANEL_VCC
60P EPI Output
EO, GCLK, RIGHT
I2C_2 MCLK, GST
M16p
P-gamma
(8CH)
VCC, HVDD,
VGH, VEPI, VDD, VEPI, Vterm,
7. EPI block (PMIC)
VCOM1FB/ PMIC VGL2, VCOM1,2 HVDD, VCOM1,2,
VCOM2FB VGL1,2, VGH
VST, RESET, VST, RESET, VGH_E/O
VGH_E/O
VCOM1FB
EO, GCLK, [TX_LOCKN]
P-GAMMA Voltage Level shifter
8 CH OUTPUT CLK[1:8] MCLK, GST
LOCK_IN
LOCK
CK_IN
[OUT4P]
: EPI 6 Lane CLK[1:8]
[OUT9N]
MAIN
- 17 -
SOC [OUT12P]
: EPI 6 Lane
[OUT17N] CLK[1:8]
Copyright ©
PANEL_VCC
VCOM2FB
VST, RESET, VGH_E/O
Sub VDD, Vterm
PMIC VDD, VEPI, Vterm,
HVDD, VCOM1,2,
Only for training and service purposes.
VGL1,2, VGH
P-gamma
(8CH) 60
60P
0 EPI Output
LEFT
LG Electronics Inc. All rights reserved.
EXPLODED VIEW
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.
AS1
910
400
900
120
521
540
LV1 LV2
710
200T
570
810
571
530
500
300
700
200
A10
820
A9
AR2
- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
DISASSEMBLY GUIDE
1. Disassemble Stand
Pull Center of Cable Cover Disassemble Stand Cover
and Pull down Cable Cover
Disassemble Screw (4EA)
2. Disassemble B/C Screw
O FAB31843216 (3EA) : M3*5.5, 5~7kgf.cm
O FAB31843217 (6EA) : M3*8, 5~7kgf.cm
- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
3. Disassemble Back Cover
Pull the Back Cover
Pull the Power Cord Bracket upward with using snap.
Holing Power Cable
Change Position
and Pull up Back
Cover
4. Assemble Back Cover
Push the LATCH
(Push the this point using your palm until you heard assembling sound)
(Push the this point using your palm until you heard assembling sound)
(Push) (Push)
(Fix with the screw after checking whether the Module's screw holes match with B/C's screw hole)
O FAB31843216 (3EA) : M3*5.5, 5~7kgf.cm
O FAB31843217 (4EA) : M3*8, 5~7kgf.cm
- 20 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
TROUBLE SHOOTING GUIDE
Copyright © 2017 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
on/off
8 No audio/Normal video 8
C. Audio error
9 Wrecked audio/discontinuation/noise 9
10 Remote control & Local switch checking 10
11 MR15RA operating checking 11
D. Function error
12 Wifi operating checking 12
13 External device recognition error 13
14 E. Noise Circuit noise, mechanical noise 14
15 F. Exterior error Exterior defect 15
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2017 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 Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A18
No video Normal Y Check Back Light Y Check Power Normal Y
On Replace T-con/Main
Normal audio audio On with naked eye Board voltage Board or module
20V, 13.2V etc.
N N N
Move to No Check Power Board 20V output Repair Power
☞A18
video/No audio Board or parts
Replace Inverter
Normal Y
or module
voltage
N End
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 © 2017 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
Check various Y Check and
No Video/ Normal
voltages of Power replace
No audio voltage?
Board (20V, 13.2V…) MAIN B/D
N
End
Replace Power
Board and repair
parts
2
Copyright © 2017 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%)
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
N Y
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 © 2017 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
-COMPONENT Replace Main B/D Replace module
error? (V by one) error? error?
-AV
and contact
-HDMI
N condition N N
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 © 2017 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
-External Input Y Check and
Screen Y device Screen N Screen
-Component Normal? replace Link Replace Main/T-con B/D
normal? connection normal? normal?
-HDMI Cable
condition For LGD panel
N N Y 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
condition by input
-External Input External
Check S/W Version Check N
-Component Input Connect other external N
version
-HDMI/DVI error device and cable Screen Replace
(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 © 2017 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
Logo LED On? operation? On ‘”High”
On Remote control B/D
. Stand-By: Red or Turn On N
. Operating: Turn Off Y
Check Power cord Replace Main B/D
was inserted properly
☞A18
Measure voltage of each output of Power B/D
N
Normal?
Y
Y Y
※ Normal
voltage?
Replace Main B/D
Close Normal
Check ST-BY 3.5V
Y
voltage? N
☞A18 Replace Power B/D
N
Replace Power
B/D
6
Copyright © 2017 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
* 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)
7
Copyright © 2017 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
Check outlet
☞A19
N Y
Check A/C cord Error? Check Power Off CPU
Replace Main B/D Normal? End
Mode Abnormal
N
Check for all 3- phase
power out Y Abnormal Replace Power B/D
1
Fix A/C cord & Outlet ☞A18
and check each 3
(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
8
Copyright © 2017 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 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
Replace Speaker
9
Copyright © 2017 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/
Replace Main B/D voltage?
N 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 © 2017 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 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
☞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 © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
D. Function error Established
Error date
symptom
MR15 operating checking Revised date 12/16
2. MR15(Magic Remocon) operating error
☞A4
Check the RF Receiver ver N Check MR15 Normal Y
Press the Is show ok N Turn off/on the
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 MR15
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
Y MR15
Close
Down load the Firmware
* If you conduct the loop at 3times, change the M4.
* INSTART MENU14.RF
Remocon Test3. Firmware
download
12
Copyright © 2017 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 ☞A23
Check the Wi-Fi Mac value N Check the Wifi wafer Normal N Replace
INSTART menu is “NG”? Voltage?
1pin 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 © 2017 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
Check technical
Check Y 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
Fix in DVI, Optical Replace Main B/D
external device/cable Recognition error
accordance
with technical
information
14
Copyright © 2017 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
agree, apply the process by stage. OR
※ Describe the basis of the description ※ If there is a “Tak Tak” noise from the
in “Part related to nose” in the Owner’s cabinet, refer to the KMS fix information and
Manual. then proceed as shown in the solution manual
(For models without any fix information,
provide the description)
15
Copyright © 2017 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 © 2017 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 (EPI) reconnection
7 A. Video error_ Color error A7
condition
A-1/11
8 Check Cable (1) ~(2)
A-2/11
A-3/11 ~
9 Exchange Main Board (1) ~ (3)
A-5/11
Defected Type caused by T-Con/ A-6/11 ~
10 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
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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
B. Power error_ No power
15 Check power input Voltage & ST-BY 3.5V A18
B. Power error_Off when on, off
16 POWER OFF MODE checking method A19
while viewing
Checking method in menu when there is no
17 A20
C. Audio error_ No audio/Normal audio
video Voltage and speaker checking method when
18 A21
there is no audio
19 Remote control operation checking method A22
D. Function error
20 Motion Remote operation checking method A23
21 Wifi operation checking method A24
A24-
22 How to use the Service remote control
A26
23 Check items after Main B/D replacement A27
E. Etc
24 Adjustment Test pattern – ADJ Key A28
How to use JIG
25 A29
(Power B/D Diganostic Smart Jig Multi Gender)
Copyright © 2017 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 front side.
A1
Copyright © 2017 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
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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 input signal strength checking method A3
date
Advanced Channels Channel Tuning
Manual Tuning
When the signal is strong,
use the attenuator (-10dB, -
15dB, -20dB etc.)
A3
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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 Version checking method date A4
1. Checking method for remote control for adjustment
Version
Press the IN-START with the remote
control for adjustment
A4
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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 date A5
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
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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 Cconnection diagram (1) date A6
As the part connecting to the external input, check
the screen condition by signal
A6
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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
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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 © 2017 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 © 2017 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 © 2017 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 © 2017 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 © 2017 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 © 2017 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 © 2017 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 © 2017 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 © 2017 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
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Only for training and service purposes.
Appendix : Exchange Power Board (PSU)
No Light No picture/Sound Ok
A - 11/11
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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
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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 3.5V A18
date
Check the DC 13.2V line for ST-BY Voltage
A18
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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 A19
Entry method
1. Press the IN-START button of the remote
control for adjustment
2. Check the entry into adjustment item 3
A19
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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 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
A20
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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 A21
when there is no audio
1 SPK_R-FT 7 SPK_L-_TW
2 SPK_R+FT 8 SPK_L+_TW
3 SPK_L-FT 9 SPK_R-_CT
4 SPK_L+FT 10 SPK_R+_CT
③
5 SPK_R-_TW 11 SPK_L-_CT
6 SPK_R+_TW 12 SPK_L+_CT
② ①
Checking order when there is no audio
1.Check the contact condition of or 13.2V connector of Main Board
2. Measure the 13.2V 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.
A21
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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 A22
Pin Pin name
1 LED_R
① IR & EYE Sensor 2 GND
3 IR
4 +3.5V_ST
5 GND
③ 6 GND
7 EYE_SCL
8 KEY2
9 EYE_SDA
10 KEY1
IR & LOGO light Rear 11
12 GND
13 GND
14 GND
15 Device
② 16 Wakeup Host
17 Power on
18 GND
19 +3.5_Wifi
20 Wifi DP
21 Combo Reset
Checking order to check remote control 22 Wifi DM
23 GND
Checking order 24 +3.5_Wifi
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.
A22
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Standard Repair Process Detail Technical Manual
Error Established
symptom
D. Function error
date
Revised
Content Remote control operation checking method A23/A24
date
Pin Pin name
1 LED_R
① Wifi & BT Front 2 GND
3 IR
4 +3.5V_ST
5 GND
6 GND
7 EYE_SCL
8 KEY2
9 EYE_SDA
10 KEY1
11
Wifi & BT Rear 12 GND
13 GND
14 GND
15 Device
16 Wakeup Host
17 Power on
18 GND
19 +3.5_Wifi
20 Wifi DP
21 Combo Reset
22 Wifi DM
Checking order to check motion remote/wifi 23 GND
② 24 +3.5_Wifi
Checking order
1.Check BT/Wifi cable condition between BT/Wifi assy & Main board.
2.Check the 3.5V on the terminal 24
A23/A24
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom
E.Etc
date
Revised
Content How to use the Service remote control A24
date
1. How to access the remote control
0 4 1 3
0 4 1 3
A24
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Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom
E.Etc
date
Revised
Content How to use the Service remote control A25
date
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)
A25
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Standard Repair Process Detail Technical Manual
Error Established
symptom
E.Etc
date
Revised
Content How to use the Service remote control A26
date
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
A26
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Standard Repair Process Detail Technical Manual
Error Established
symptom
E.Etc
date
Revised
Content Check items after Main B/D replacement date A27
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.
A27
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Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom
E.Etc
date
Adjustment Test pattern - ADJ Key Revised
Content date A28
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!)
A28
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Only for training and service purposes.
Smart JIG Power Diagnosis
Muitl Gender Guide
(P/N : RAD32507801) (P/N : RAD33187801)
A 29 (1/19)
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Only for training and service purposes.
Power Board Muitl Gender JIG Diagram (P/N: RAD33187801)
※ 12/13/14Y Smart JIG connector applied
15Y 15Y
(LF/UF Series) (OLED)
28Pin 24Pin 24Pin 24Pin NC
1. New 24Pin
Smart JIG
18Pin 16Y
(OLED)
24Pin
13Y/14Y 28Pin
2. Old
Smart JIG
17Y
(OLED)
24Pin 12Y
28Pin
16Y/17Y
18Pin (UH/UJ)
24Pin Check 12Pin 12Pin 28Pin 28Pin
28Pin
Cable connection
Includes 49UJ63
17Y 16Y 16Y/17Y 16Y/17Y 16Y
(SJ/UJ) (UH) (LH/LJ) (UH/SJ) (UH) A 29 (2/19)
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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
A 29 (3/19)
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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.
A 29 (4/19)
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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
A 29 (5/19)
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`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
A 29 (6/19)
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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.
A 29 (7/19)
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`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.
A 29 (8/19)
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`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
A 29 (9/19)
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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
A 29 (10/19) can be judged as defective.
Copyright © 2017 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
A 29 (11/19) can be judged as defective.
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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) A 29 (12/19)
can be judged as defective.
Copyright © 2017 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) A 29 (13/19)
can be judged as defective.
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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
A 29 (14/19) can be judged as defective.
Copyright © 2017 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
A 29 (15/19) can be judged as defective.
Copyright © 2017 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
A 29 (16/19) can be judged as defective.
Copyright © 2017 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
A 29 (17/19) can be judged as defective.
Copyright © 2017 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
A 29 (18/19) can be judged as defective.
Copyright © 2017 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
A 29 (19/19) can be judged as defective.
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
