OLED TV
SERVICE MANUAL
CHASSIS : EAX1Z
MODEL : OLED88ZXPUA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71717001 (2003-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 © 2020 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 ................................................................................... 11
ASSEMBLY / DISASSEMBLY GUIDE .................................................... 13
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 OLED TV used EAX1Z (1) Performance: LGE TV test method followed
chassis. (2) Demanded other specification
- Safety : UL, CSA, CE, IEC specification
- EMC : FCC, ICES, CE, IEC specification
2. Test condition
Each part is tested as below without special appointment.
(1) Temperature : 25 ºC ± 5 ºC(77 ± 9 ºF) , CST : 40 ºC ± 5 ºC
(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 gender(1EA)
6 HDMI Input HDMI 1 PC / DTV format Support HDMI2.1
HDMI 2 PC / DTV format Support HDMI2.1
HDMI 3 PC / DTV format Support HDMI2.1
HDMI 4 PC / DTV format Support HDMI2.1
7 Audio Input AV Audio / DVI Audio Rear(AV Gender),
L/R Input : Rear
AV and DVI use same jack
8 Audio out SPDIF(1EA) Optical Audio out Rear(1EA)
HeadPhone(1EA) HeadPhone out Rear(1EA)
9 USB Input(3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD
10 Ethernet Connect (1EA) Ethernet Connect
-6- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
5. External Input Support Format
5.1. HDMI Input (PC/DTV)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
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 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 SXGA Support to HDMI-PC
9 1920*1080 67.5 60 158.4 WUXGA(Reduced
Blanking)
10 1920*1080 134.86 119.88 296.7 UDTV 2160P Not Support for FHD.
11 1920*1080 135 120 297 UDTV 2160P Not Support for FHD.
12 3840*2160 53.95 23.98 296.7 UDTV 2160P Not Support for FHD.
13 3840*2160 54 24 297 UDTV 2160P Not Support for FHD.
14 3840*2160 56.25 25 297 UDTV 2160P Not Support for FHD.
15 3840*2160 61.43 29.97 296.7 UDTV 2160P Not Support for FHD.
16 3840*2160 67.5 30 297 UDTV 2160P Not Support for FHD.
17 3840*2160 112.5 50 594 UDTV 2160P Not Support for FHD.
18 3840*2160 134.86 59.94 593.4 UDTV 2160P Not Support for FHD.
19 3840*2160 135 60 594 UDTV 2160P Not Support for FHD.
20 4096*2160 53.95 23.98 296.7 UDTV 2160P Not Support for FHD.
21 4096*2160 54 24 297 UDTV 2160P Not Support for FHD.
22 4096*2160 56.25 25 297 UDTV 2160P Not Support for FHD.
23 4096*2160 61.43 29.97 296.7 UDTV 2160P Not Support for FHD.
24 4096*2160 67.5 30 297 UDTV 2160P Not Support for FHD.
25 4096*2160 112.5 50 594 UDTV 2160P Not Support for FHD.
26 4096*2160 134.86 59.94 593.4 UDTV 2160P Not Support for FHD.
27 4096*2160 135 60 594 UDTV 2160P Not Support for FHD.
28 2560*1440 88.78 59.95 241.5 3K (UHD 60Hz models only),
29 2560*1440 182.99 119.99 497.7 3K Support only when UHD
DeepColor is On
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
HDMI-DTV
1 640*480 31.46 59.94 25.12 SDTV 480P
2 640*480 31.5 60 25.12 SDTV 480P
3 720*480 31.47 59.94 27 SDTV 480P
4 720*480 31.5 60 27.02 SDTV 480P
5 720*576 31.25 50 27 SDTV 576P
6 1280*720 44.96 59.94 74.17 HDTV 720P
7 1280*720 45 60 74.25 HDTV 720P
8 1280*720 37.5 50 74.25 HDTV 720P
-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 Remarks
9 1920*1080 28.12 50 74.25 HDTV 1080I
10 1920*1080 33.72 59.94 74.17 HDTV 1080I
11 1920*1080 33.75 60 74.25 HDTV 1080I
12 1920*1080 26.97 23.97 63.29 HDTV 1080P
13 1920*1080 27 24 63.36 HDTV 1080P
14 1920*1080 33.71 29.97 79.12 HDTV 1080P
15 1920*1080 33.75 30 79.2 HDTV 1080P
16 1920*1080 56.25 50 148.5 HDTV 1080P
17 1920*1080 67.43 59.94 148.35 HDTV 1080P
18 1920*1080 67.5 60 148.5 HDTV 1080P
19 1920*1080 112.5 100 297 UDTV 2160P Not Support for FHD.
20 1920*1080 134.86 119.88 296.7 UDTV 2160P Not Support for FHD.
21 1920*1080 135 120 297 UDTV 2160P Not Support for FHD.
22 3840*2160 53.95 23.98 296.7 UDTV 2160P Not Support for FHD.
23 3840*2160 54 24 297 UDTV 2160P Not Support for FHD.
24 3840*2160 56.25 25 297 UDTV 2160P Not Support for FHD.
25 3840*2160 61.43 29.97 296.7 UDTV 2160P Not Support for FHD.
26 3840*2160 67.5 30 297 UDTV 2160P Not Support for FHD.
27 3840*2160 112.5 50 594 UDTV 2160P Not Support for FHD.
28 3840*2160 134.86 59.94 593.4 UDTV 2160P Not Support for FHD.
29 3840*2160 135 60 594 UDTV 2160P Not Support for FHD.
30 3840*2160 225 100 1188 UDTV 2160P 4K120 model
31 3840*2160 269.73 119.88 1186.8 UDTV 2160P (K6Hp HDMI 3,4 port, O20)
or 8K model
32 3840*2160 270 120 1188 UDTV 2160P
33 4096*2160 53.95 23.98 296.7 UDTV 2160P Not Support for FHD.
34 4096*2160 54 24 297 UDTV 2160P Not Support for FHD.
35 4096*2160 56.25 25 297 UDTV 2160P Not Support for FHD.
36 4096*2160 61.43 29.97 296.7 UDTV 2160P Not Support for FHD.
37 4096*2160 67.5 30 297 UDTV 2160P Not Support for FHD.
38 4096*2160 112.5 50 594 UDTV 2160P Not Support for FHD.
39 4096*2160 134.86 59.94 593.4 UDTV 2160P Not Support for FHD.
40 4096*2160 135 60 594 UDTV 2160P Not Support for FHD.
41 4096*2160 225 100 1188 UDTV 2160P 4K120 model
42 4096*2160 269.73 119.88 1186.8 UDTV 2160P (K6Hp HDMI 3,4 port,
O20) or 8K model
43 4096*2160 270 120 1188 UDTV 2160P
44 7680*4320 107.89 23.98 1188 8K 8K Model Only.
45 7680*4320 108 24 1188 8K 8K Model Only.
46 7680*4320 110 25 1188 8K 8K Model Only.
47 7680*4320 131.87 29.97 1188 8K 8K Model Only.
48 7680*4320 132 30 1188 8K 8K Model Only.
49 7680*4320 220 50 2376 8K 8K Model Only.
50 7680*4320 263.74 59.94 2376 8K 8K Model Only.
51 7680*4320 264 60 2376 8K 8K Model Only.
-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 (1) Menu -> All Settings -> Support -> Software Update
message
(3) Click [YES]: initiate the download and install of the update.
(4) C lick [Check Now]: move to “About This TV” page for
update (2) C lick [CHEK FOR UPDATES] : system check newest
(5) TV is updating version
(6) After finished the update, below Pop-up appear (3) Click [DOWNLOAD AND INSTALL]
(4) TV is updating
(7) Click [Yes] : TV will be DC OFF -> ON
(8) After TV turned on, Check the updated SW Version and
Tool Option
(5) After finished the update, below Pop-up appear
(6) Turn OFF the TV and On. Check the updated SW Version
and Tool Option
-9- Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
3.3V 1.1V 1.8V 0.8V 0.8V
5V
13V 3.3V 13V 13V 0.8V 13V 0.8V
3.5V 1.1V 3.5V 1.8V 5V
Normal DDR DDR Normal DDR/C4TX AON X_TAL
50MHz
1.8V 1.1V 5V
0.8V 1.8V 3.3V 1.1V 3.5V
3.5V_ST 0.8V 0.8V
P_TS_IN
13V 3.5V 13V 0.8V 13V 0.8V LPDDR4 P_TS_OUT CI Slot
ST_BY Core CPU MICOM
16Gb 3.5V_ST
1.8V 1.8V LPDDR4 I2C_4 NVRAM (256Kb)
13V
13V 3.5V 16Gb
1.8V 1.8V eMMC 3.3V
To eMMC (16GB)
IO AON CLK/DATA/STRB
F20 5V
1.8V
Vx1 USB1 (2.0)
Vx1 VIDEO (16 lane)
Vx1 USB2 (2.0)
F20 OCP
Vx1 OSD (4 lane) USB3 (2.0)
13V 3.3V USB USB
MAIN Audio AMP Main SoC H5D
3.3V O20 HDMI2.1
3.3V From
13V
- 10 -
HDMI1 Power
MAIN Audio AMP I2S Out
HDMI2(ARC)
I2C 0 B/D
HDMI3
13V Wov CLK out / DataIn HDMI4
MAIN Audio AMP IR/Key IF
IQ (+/-), IP(+/-) IF (+/-)
IF_S 3.3V
tuner
Copyright ©
BLOCK DIAGRAM
Signal Process TS
TUNER TUNER
SPDIF OUT
Power Supply
ETHERNET
USB_WIFI
CVBS/YPbPr I2C3
H-
Sub Assy (S,S2) (T2/C/A)
Input/ Output Power 3.5V_ST
Gigabit LNB 3.3V
AMP
Air/
T2/C/S/S2 H-NIM
DVB-S
MAX323
3.5V_ST ethernet Cable
MIC
IR / KEY
AV/COMP
IR Blaster
Only for training and service purposes.
H/P
SPDIF
RS-232
To WIFI/BT
LAN
Combo
Area OPT
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.
100
450
520
902
530
420
410
901
531
900
AF3
532
AM1
902
AC1
511
AB2
510
440
570
AB1
120
540
AF2
810
AF1
400
550
950
800
AR2
200
500
121
560
430
- 11 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
EXPLODED VIEW(CABLE)
JOG
FAN
Main Board
HP2
WIFI
HW1
FA1
HP1
FRC Board
700
LV1
LV2
HS1
LV3
LV4
IR
SP1
SP3
SP2
DC2
DC1
SP4
SPLITTER
DC
- 12 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ASSEMBLY / DISASSEMBLY GUIDE(SET)
[Precautions for OLED88ZX Handling]
When moving the set, do not hold the head part (red dotted line part) by hand, move it by holding the stand (green
line part).
When moving the set, Handling by more than 4 persons.
* Refer to the picture below.
- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
[Disassembly Guide]
(1-1) Put the set on a flat floor and separate the DC Cable Cover.(Pull the left side of the cover to separate.)
(1-2) Separate the Main Cable Cover. (Pull the right side of the cover to separate.)
P
ull the Stand Cable Cover to separate (vertical direction, horizontal direction 1EA each), and disconnect the
varieties of cables.
(1-3) Unscrew Screw(A) 1EA for DC Cable Fixer, and disconnect the DC Cable.
1-1
1-2
Stand
Cable Cover
Stand
Cable Cover
1-3
DC Cable Fixer DC Cable
A
- 14 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(2-1) Unscrew the Sound Reflector Fixation Screw(B) 2EA on the underside of a stand-top.
(2-2) Push the front protrusion of the Sound Reflector upwards to separate it from the stand.
* The Sound Reflector is attached to the stand only by a magnet. Thus, Make sure that the Sound Reflector does
not fall off to the floor when it is removed.
2-1
Sound Reflector
B
2-2
Sound Reflector
- 15 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(3-1) Unscrew the Shaft(C) 4EA on the underside of a stand-top. (Use hexagonal wrench)
* The Shaft(C) is not completely separated from the Stand. (The Shaft(C) is fixed to the Stand by washer.)
(4-1) Lift the Head part and separate it from the Stand.
3-1
C C
C C
C
The Shaft is fully released status.
(※ The Shaft is not separated from the Stand)
4-1
- 16 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(5-1) Unscrew the Back Cover Fixation Screw(D) 9EA.
(5-2) Separate the Back Cover by lifting the bottom of the Back Cover. (Carefully separate the upper holder joints.)
5-1
D
D
D D
D
D D D D
5-2
Back Cover inner holder joints
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Only for training and service purposes.
(5-3) Back Cover disassembly completed.
5-3
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Only for training and service purposes.
(6-1) Pull the Stand Cable Cover on the back of the Stand to separate it. (Vertical direction 1EA, Horizontal direc-
tion 1EA)
(6-2) Separate the Cable Fixer, Pass the DC Cable through the holes, and pull down.
6-1
Stand Cable Cover
Stand Cable Cover
6-2
Cable Fixer
- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(7-1) Unscrew the Power Box Fixation Screw(E) 3EA on the back of the Stand.
(7-2) Separate the Power Box from Stand by pulling the DC Cable and the Power Code Cable.
* Pull out gently while pulling the left and right simultaneously to avoid damage or missing the cable.
7-1
E E
E
7-2
Power Box
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Only for training and service purposes.
* As follows, When re-assembling the Power Box
Make sure that the Guide Pem-nut on the Power Box is inserted into the Stand inner Guide Rail.
For normal assembly, the left and right sides must be inserted to the end at the same time.
- 21 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(8-1) Unscrew Screw(F) 12EA on top of Power Box and separate Power Box Top Cover.
8-1
F F F F F F
Power Box Top cover
F F F F F F
- 22 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
[Assembly Guide]
(1-1) Cover the Power Box Top Cover and Screw the Screw(F) 12EA.
1-1
F F F F F F
Power Box Top cover
F F F F F F
- 23 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(2-1) Insert the Power Box into the stand. (Make sure that the Guide Pem-nut on the Power Box is inserted into the
Stand inner Guide Rail.)
* For normal assembly, the left and right sides must be inserted to the end at the same time.
(2-2) Screw the Power Box Fixation Screw(E) 3EA on the back of the Stand.
2-1
2-2
E E
E
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Only for training and service purposes.
(3-1) Insert the DC cable inside the back of the stand (red square part), and Pass through the upper square hole
(green square part).
Tighten the cable fixer.
(3-2) Tighten the Stand Cable Cover. (Vertical direction 1EA, Horizontal direction 1EA)
3-1
Cable Fixer
3-2
Stand Cable Cover
Stand Cable Cover
- 25 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(4-1) Cover the Back Cover and tighten the Latch by pressing the Latch part.
* When pressing the Latch part, Make sure that you hear a ‘Tap' sound and make a normal connection.
(4-2) Screw the Back Cover Fixation Screw(D) 9EA.
4-1
Back Cover inner holder joints
4-2
D
D
D D
D
D D D D
- 26 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(5-1) Insert the Head into the Stand.
* Be careful not to fit the DC Cable between the Head and the Stand. (If necessary, fix the DC Cable with tape
before inserting the Head.)
(5-2) Screw the Shaft(C) 4EA.
* If the head of the shaft does not protrude from the stand surface, it is normally fastened.
5-1
Ca ution Cable
If necessary, fix the DC Cable with tape
before inserting the Head.
5-2
C C
C C
C
※ T h e head of th e shaft does n ot protrude
fr om th e stand surface.
- 27 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
(6-1) Tighten the Sound Reflector. (Attached with magnet)
*C heck the DC Cable clearance before the Sound Reflector tightening. The Sound Reflector does not tighten properly if the DC
Cable is protruding.
(6-2) Screw the Sound Reflector Fixation Screw(B) 2EA
* Be careful not to scratch inside the stand when Sound reflector is assembled to Stand.
6-1
Sound Reflector
Reflector attached by magnet.
※Check the DC Cable before assemble Reflector to Stand.
Cable protrudes to the outside (NG) Cable does not protrude
to the outside (OK)
6-2
Sound Reflector
B
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Only for training and service purposes.
(7-1) Insert the DC Cable to connector.
* Match the color of label and cable. Fix the cable as below picture.
Insert the DC Cable Fixer and Screw the Screw (A) 1EA.
(7-2) Insert Cables to back of Stand, and pass the cable through the top cover hole. Insert Cable Fixer. Assemble
Stand Cable Cover. (Vertical, Horizontal each direction 1EA)
(7-3) Assemble the Main Cover and the Power Cover.
7-1
Matching color of Cable and Label
DC Cable Fixer
A
Fixing Cable
7-2
Cable Fixer
Stand
Cable Cover
Stand
Cable Cover
7-3
- 29 - Copyright © LG Electronics Inc. All rights reserved.
Only for training and service purposes.
TROUBLE SHOOTING GUIDE
Copyright © 2020 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 Picture broken/ Freezing 3
A. Video error
4 Color error 4
Vertical/Horizontal bar, residual image, light
5 5
spot, external device color error
6 No power 6
B. Power error Off when on, off while viewing, power auto
7 7~8
on/off
8 No audio/Normal video 9
C. Audio error
9 Wrecked audio/discontinuation/noise 10
10 Remote control & Local switch checking 11
11 PM20 operating checking 12
12 D. Function error
Wifi operating checking 13
13 External device recognition error 14
14 Voice Recognition function error 15
15 E. Noise Circuit noise, mechanical noise 16
16 F. Exterior error Exterior defect 17
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2020 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
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, VX1 or EPI Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A9
No video Normal Y Check Vx1 lock Y Check Power board Normal Y
Normal audio On Replace Main Board
audio voltage output to Main. voltage
(12V, 20V)
N N N
Move to No Repair Power
☞A9 Check Power Board output to Module (23.5V)
video/No audio Board or parts
Normal Y Replace Module
voltage
End
N
Repair Power
Board or parts
※Precaution ☞A4 & A2
Always check & record S/W Version and White
Replace Main Board Re-enter White Balance value
Balance value before replacing the Main Board
1
Copyright © 2020 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
☞A9
No Video/ Check various voltages of Check and
Y
No audio Power Board Board (Main) Normal
replace
(12V,20V) voltage?
MAIN B/D
N End
Replace Power
Board and repair
parts
2
Copyright © 2020 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
. 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 Tuner Y
Connection
Picture? S/W Version Bulletin? soldering Close
1. Reconnection
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 © 2020 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
☞A6 ☞ A7
※ Check and
Check color by input
replace Link
-External Input Y Y
-AV/Component
Color Cable Color
Replace Main B/D
Color Y Replace module
error? (Vx1 Cable) error? error?
-HDMI
and contact
N condition N N
End
Check error
color input mode
☞A19
External Input/ Check external External Y
Check Test pattern Component device and device/Cable Replace Main/T-con B/D
error cable normal
N
Request repair
for external
device/cable
N
Check external External Y
HDMI
device and device/Cable Replace Main/T-con B/D
error
cable normal
4
Copyright © 2020 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
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 B/D
normal? device normal? normal?
Cable(Vx1)
connection
condition N Y
N Y
Replace Request repair End End
☞A19 module for external
device
Check Test pattern
External device screen error-Color error
Check screen
N condition by input External Connect other external
Check device and cable
Check S/W Version -External Input Input
version (Check normal operation of
-Component Screen N
error
Replace Main
-HDMI/DVI External Input, Component, B/D, Module
normal?
Y RGB and HDMI/DVI by
Component connecting Jig, pattern
Y
S/W Upgrade error Generator ,Set-top Box etc.
Request repair for
external device
Connect other external
N Y
Normal device and cable
screen?
HDMI/ (Check normal operation of Screen N Replace Main
External Input, Component,
DVI normal? B/D, Module
Y RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
End
5
Copyright © 2020 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
☞A8 ☞A9
DC Power on
Check Power Y Normal N Check Power Y Replace
by pressing Power Key OK?
Power Indicator LED On? operation? On ‘”High” Power B/D
On Remote control
. Stand-By: Red or Turn On
N Y N
. Operating: Turn Off
Check Power cord Replace Main B/D
was inserted properly ☞A9
Measure each output
voltage of Power B/D
N
Normal?
Y Y Y
Normal
Replace Main B/D
voltage?
Normal
Close Check Power ST-BY 7.8V Y
voltage? N
☞A9 Replace Power B/D
N
Replace Power
B/D
6
Copyright © 2020 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
Check outlet
☞A10
N Y
Check A/C cord Error? Check Power Off CPU
Replace Main B/D Normal? End
Mode Abnormal
N
Check for all 2-phase
power out Y Replace Power B/D
Abnormal
Fix Piwer cord & Outlet and
check each 2 phase out
☞A9
(If Power Off mode
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
7
Copyright © 2020 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
* 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)
BDP_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 © 2020 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
☞A11 ☞A12+A9
No audio
Check user menu N Check audio B+
Normal Y
→ Internal TV Speaker Off voltage(20V) of
Screen normal voltage
or not Power Board
Y N
Cancel OFF Replace Power Board and repair parts
Check Speaker N
Disconnection Replace MAIN Board End
disconnection
Y
Replace Speaker
9
Copyright © 2020 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
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
Wrecked audio/
☞A12+A9
Check and replace
Discontinuation/ Check audio
speaker and
Noise for B+ Voltage (20V)
connector
Check input all audio
signal Y
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 © 2020 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
1. Remote control(R/C) operating error Replace
Main B/D
☞A13 ☞A13 ☞A13
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
☞A9
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 © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
D. Function error Established
Error date
symptom
Magic remote operating checking Revised date
2. Magic Remote Control operating error
☞A4
Check Magic Y Turn off/on the
Check the RF Receiver N Normal Press the Is show ok N
remote control set and press
INSTART menu ver is“00.00”? operating? wheel message?
itself Operation the wheel
N
Y
Y
☞A14 Check & Replace Battery Close
Check & Repair of Magic remote control
RF assy
connection
Normal Y
operating? Close
☞A4
Is show ok N Press the back
message? key about 5sec
RF Receiver ver N N
Close
is “00.00”? Y
Replace Magic
remote control
Y Close
Download the Firmware
• If you conduct the loop at 3times,
change the Magic remote control.
Instart Menu
→ 12.RF Remote control Test
→ Receiver Firmware Download
12
Copyright © 2020 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
3.Wifi operating error
☞A4 ☞A14
Check the Wi-Fi Mac value N Check the Wifi wafer Normal N Replace
Instart menu is “NG”? 1st pin (3.5V) Voltage? Main B/D
Y
☞A14 Y
Close
Check & Repair
Wifi cable
connection
☞A4
Wi-Fi Mac value N
is “NG”? Close
Y
Replace the Wifi assy
13
Copyright © 2020 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
Check technical
Check Y External Input
Signal information Technical N
input And Component Replace Main B/D
input? - Fix information information?
Recognitionerror
signal
- S/W Version
N Y
HDMI/
Check and fix Fix in DVI, Optical
Recognition Replace Main B/D
external device/cable accordance
with technical error
information
14
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
D. Function error
불량증상
Voice Recognition Function Error
☞A15
Check Voice Funcion Check
Network Y Y
Check network
Connected?
Recognition Function Is On In Sub Ass’y
in menu menu? Cable
N
N
Make the
Connect network function ‘on’
Close Close
Cable Change Voice
Connection Y Recognition Change Main B/D
Is OK? Ass’y
N
Re-connect Close
Cable Close
Close
15
Copyright © 2020 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
Identify
Circuit Check location
nose Replace PSU
noise of noise
type
Mechanical Check location
noise of 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 in
cabinet, refer to the KMS fix information and
“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)
16
Copyright © 2020 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
Zoom part with Module
Replace module
exterior damage damage
Cabinet
Replace cabinet
damage
Remote
control Replace remote control
damage
Stand
Replace stand
dent
17
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Contents of Standard Repair Process Detail Technical Manual
No. Error symptom Content Page Remarks
1 Check Vx1 Lock A1
A. Video error_ No video/Normal audio
2 Check White Balance value A2
TUNER input signal strength checking
3 A3
method
A. Video error_ video error /Video
4 lag/stop Version checking method A4
5 Tuner Checking Part A5
A. Video error _Vertical/Horizontal bar,
6 Connection diagram A6
residual image, light spot
Check Link Cable (Vx1/EPI) reconnection
7 A. Video error_ Color error A7
condition
Examples of Symptoms (Image Error) A-1~2/10
Examples of Symptoms (Main Board) A-3~5/10
8 Defected Type caused by Cable / Main
Board / Module Examples of Symptoms (Module) A-6~9/10
Examples of Symptoms (Power Board) A-10/10
Continue to the next page
Copyright © 2020 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
9 Check front Power Indicator A8
B. Power error_ No power
10 Check power input Voltage & ST-BY 7.8V A9
B. Power error_Off when on/off,
11 POWER OFF MODE checking method A10
while viewing
12 Checking method in menu when there is no audio A11
C. Audio error_ No audio/Normal
video Voltage and speaker checking method when there is
13 A12
no audio
14 Remote control operation checking method A13
15 D. Function error Wifi/Motion remote operation checking method A14
16 Voice Recognition operation checking method A15
17 How to use the Service remote control A16~18
E. Etc
18 Check items after Main B/D replacement A19
Copyright © 2020 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 Vx1 Lock date A1
Check a voltage of R30325 when TV is on.
Vx1 is OK if the voltage is 0V(Low).
A1
Copyright © 2020 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 © 2020 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 input signal strength checking method date A3
All settings Programmes Programme Tuning &
settings Manual Tuning
When the signal is strong,
use the attenuator
(-10dB, -15dB, -20dB etc.)
A3
Copyright © 2020 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
Press the IN-START with the remote
control for adjustment
A4
Copyright © 2020 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 checking part Revised
Content 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
Copyright © 2020 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 date A6
As the part connecting to the external input, check
the screen condition by signal
A6
Copyright © 2020 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/EPI) reconnection condition date A7
Check the contact condition of the Link Cable, especially dust or mis insertion.
A7
Copyright © 2020 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 smear Poor broken pin of FFC cable
Color is Excessive due to FFC Cable
CABLE R Color Excessive
Contact.
screen is dark due to poor contact due
CABLE Screen darkness to disconnection of the FFC cable pin.
G color transient due to poor FFC cable
CABLE G Color Excessive connection
A - 1/10
Copyright © 2020 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 VX1 cable connection problem
CABLE Color spread VX1 cable connection problem
CABLE Color spread VX1 cable connection problem
Due to foreign substance withi nVx1
CABLE Screen stop cable PIN
A - 2/10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Main Screen noise Bit noise from horizontal screen
Broken screen due to
Main Screen noise
Main IC problem
Main Dark picture Dark left-side screen
Top/bottom screen part
Main Broken picture
Picture problem due to tuner
Inner side quality problem
A - 3/10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Main Broken screen Broken screen in a horizontal manner
Main Screen spread Screen corner appears blurry
Main Color Spread Color spread on the screen
Main Blurry Screen Blurry picture on the screen
A - 4/10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
No problem at the initial stage,
Main Broken picture G-color spread after 10 minutes
Right-side
Main
Screen Right-side screen problem
problem
LG logo
Main Screen picture spread problem
Screen problem
No problem at the initial stage.
Right-side
Main During Heat run, right-side picture
picture problem
problem
A - 5/10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Un-repairable cases
MODULE Vertical bar
In this case please exchange the module
MODULE Image broken Source-driver issue
MODULE White dot White dot cause by panel issue
MODULE Line dim Vertical line cause by source-driver IC
A - 6/10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
MODULE Burnt Module burnt
MODULE Horizontal line Module is damaged
MODULE Line defect Module is damaged
Un-repairable cases
MODULE Press damage
In this case please exchange the module
A - 7/10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
MODULE Vertical bar Vertical bar cause by source-driver IC
Vertical Noise
Un-repairable cases
MODULE Brightness
In this case please exchange the module
difference
MODULE Green light Compensation error when power on/off
Color difference between screen cause
MODULE Color difference
by compensation error
A - 8/10
Copyright © 2020 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 is damaged
MODULE No image
(Can’t fix it)
Burnt
MODULE Burnt (Can’t fix it)
Screen Mura
MODULE Mura
(Can’t fix it)
A - 9/10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Appendix : Exchange Power Board (PSU)
No Light No picture/Sound Ok
A - 10/10
Copyright © 2020 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 A8
ST-BY condition: On or Off
Power ON condition: Turn Off
A8
Copyright © 2020 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 A9
date
Check a voltage of DC 12VM
(ST-BY : 7.8V, Normal : 12V)
A9
Copyright © 2020 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 A10
Entry method
1. Press the IN-START button of the remote control for adjustment
2. Check the entry into adjustment item 3
A10
Copyright © 2020 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 A11
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
A11
Copyright © 2020 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 A12
when there is no audio
① P7603
③ P20102
1 SPK_R-_FT
P20102
2 SPK_R+_FT
3 SPK_L-_FT
4 SPK_L+_FT
Checking order when there is no audio 5 SPK_R-_CT
6 SPK_R+_CT
1.Check the contact condition of or 20V connector of Main Board. 7 SPK_L-_CT
2. Measure the 20V input voltage supplied from Power Board. 8 SPK_L+_CT
(If there is no input voltage, remove and check the connector.) 9 SPK_R-_TW
10 SPK_R+_TW
3.Connect the tester P20102 to the speaker terminal and if you hear the ‘Chik~ Chik~’
11 SPK_L-_TW
sound when you touch the GND and output terminal, the speaker is normal.
12 SPK_L+_TW
A12
Copyright © 2020 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 A13
Pin Pin name
1 LED_R_JACK
① IR & EYE Sensor 2 GND
③ 3 IR_JACK
4 +3.5V_ST
5 GND
6 N.C.
7 EYE_SCL_JACK
EyeLED IR 8 KEY2_JACK
9 EYE_SDA_JACK
10 WOV_PDM0_DATAIN_JACK
② 11 N.C.
12 WOV_PDM_CLKOUT_JACK
Voice 13 +3.5V_WIFI
Recognitioin 14 GND
MIC 15 COMBO_RESET_JACK
16 BT_WAKEUP_HOST_JACK
17 WOL/WIFI_POWER_ON_JACK
18 GND
19 +3.5V_WIFI
20 WIFI_DP_JACK
WIFI_SUSPEND/
21
RESUME_JACK
22 WIFI_DM_JACK
Checking order to check remote control 23 GND
24 +3.5V_WIFI
Checking order
1. Check IR cable condition between IR & Main board.( Check picture number① and ②)
2. Check the standby 3.5V on the terminal (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.
A13
Copyright © 2020 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 WiFi/Motion Remote operation checking method date A14
Pin Pin name
① Wifi & BT Front 1 LED_R_JACK
2 GND
3 IR_JACK
4 +3.5V_ST
5 GND
6 GND
7 EYE_SCL_JACK
8 KEY2_JACK
9 EYE_SDA_JACK
10 WOV_PDM0_DATAIN_JACK
① Wifi & BT Rear 11 KEY1_JACK
12 WOV_PDM_CLKOUT_JACK
13 +3.5V_WIFI
14 GND
15 COMBO_RESET_JACK
16 BT_WAKEUP_HOST_JACK
17 WOL/WIFI_POWER_ON_JACK
② 18 GND
19 +3.5V_WIFI
20 WIFI_DP_JACK
WIFI_SUSPEND/
21
RESUME_JACK
22 WIFI_DM_JACK
23 GND
24 +3.5V_WIFI
Checking order to check motion remote/wifi
Checking order
1.Check BT/Wifi cable condition between BT/Wifi assy & Main board.
2.Check the 3.5V_WIFI on the terminal 13, 19, 24 Pin
A14
Copyright © 2020 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 Voice Recognition operating checking method date A15
1. Menu > General > AI Service 2. Voice Recognition Help and Settings
3. Settings 4. Active ‘Use Hands-free Voice Control’
A15
Copyright © 2020 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 date A16
1. How to access the remote control
0 4 1 3
0 4 1 3
A16
Copyright © 2020 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 date A17
2. Remote control part definition
POWER Power On/Off
[ETC] Each time pressing the KEY button, Mode gets changed to ETC and P-ONLY each time
ETC (Added Function) All KEY function [PIP PR-][PIP PR+][SWAP]
[PIP INPUT][DVI] KEY Function
Changed to factory mode
P-ONLY (Added
Function)
All KEY function &[INFO][STILL][HDMI HOT][USB HOT][HDMI4] KEY Action
INPUT Change to the external device mode
ARC Change in the order of 16:9=>Zoom1=>Zoom2=>Cinema Zoom=>Aucto Screen=>4:3=>16:9
Changes in the order of Bright Picture=>Easy Picture=>Cinema=>Spots=>Game=>
PSM
Custom PIcture1=>Custom Picture2=>Bright Picture
SSM (Added Function) Standard(user)=>music=>cinema=>sports=>game=>standard(user)
PIP Picture In Picture is activated
TEXT Access to the Power Only mode
CAP Broadcasting caption(on/off)
MPX Stereo mode (mono, stereo, foreign language) access
Used when in factory mode
Simplink (Added
Access to the Simplink-connected device
Function)
Digital EYE function ON/OFF
EYE
For some Model, access to the Test Pattern
TILT Used for screen tilting change (Access to the old PDP control mode)
A17
Copyright © 2020 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 date A18
B-TOOTH
Connected to Blue-Tooth
(Added function)
Model Nam ex) 42PG60D-NA Current Model Name S/W Version ex)
IN-START V03.11.0 Current S/W version
MICOM Version ex) V3.05.0 current Mi-Com version UTT ex) User TV total usage time
POWER OFF STATUS ex) Shows power-off status
ADJ
Test Pattern (Off=>White=>Red=>Green=>Blue=>Black=>Pattern=>Off) Change
X-STUDIO (Added function) HDD,USB, external device’s HDD screen is activated
MENU User function gets activated
EXIT Exit from the current mode
TIME SHIFT (Added
Moves forward/backward of recorded contents
function)
MUTE Mute function (0 Volume)
IN-STOP SET to factory mode
VOL + - Volume Up/Down
CH + - Channel Up/Down
AV1,2,3 (Added function) Connects to external input 1,2,3
COMP1,2 (Added function) Connects to Component 1,2
HDMI1,2,3,4
Connects to HDMI 1,2,3,4
(Add function)
DVI (Add function) Connects to DVI
A18
Copyright © 2020 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 Check items after Main B/D replacement date A19
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.
After replacing the main board, key in the
recorded value.
A19
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
