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OLED TV
SERVICE MANUAL
CHASSIS : EB14Y / ED14Y
MODEL : OLED77Z19LA
OLED77Z1PTA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71796432 (2103-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 © 2021 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 ................................................................................... 13
ASSEMBLY / DISASSEMBLY GUIDE..................................................... 14
TROUBLE SHOOTING GUIDE ................................................. APPENDIX
-2- Copyright © LG Electronics Inc. All rights reserved.
Only 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 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 CAUTION: Be sure no power is applied to the chassis or cir-
high voltage meter or other voltage measuring device (DVM, cuit, 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 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 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 h t 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 training and service purposes.
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This specification is applied to the LED TV used EB14Y / ED14Y chassis.
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 ± 2 °C
(2) Relative Humidity: 60 % ± 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.
3. Test method
(1) Performance: LGE TV test method followed
(2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC specification
-6- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
4. Model General Specification
No. Item Specification Remarks
1 Market EU/CIS/OCEANIA/ASIA
(1) Digital TV : DVB-T/T2, DVB-C, DVB-S/S2
Broadcasting (2) Analogue TV
2 Depending on country
system PAL B/B, PAL B/G, PAL D/K, PAL-I,
SECAM B/G, SECAM D/K, NTSC-M
(1) Digital TV
- DVB-T / DVB-T2*
-VHF III : 174 ~ 230 MHz
-UHF IV : 470 ~ 606 MHz
-UHF V : 606 ~ 862 MHz
3 Program coverage Only DVB-T2/C/S2 support model only.
-S Band II : 230 ~ 300 MHz
-S Band III : 300 ~ 470 MHz
-DVB-S/S2* (950 ~ 2150 MHz)
-DVB-C* (46 ~ 890 MHz)
(2) Analogue TV (46 ~ 862 MHz)
► 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
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,
- Modulation : Code Rate
Analog : Upper Heterodyne QPSK : 1/2, 2/5, 2/3, 3/4, 5/6
Digital : COFDM(DVB-T) Only DVB-T Model 16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
4 Receiving system
Digital : COFDM(DVB-T/T2) Only DVB-T2 Model 64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
Digital : 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, HDMI1, HDMI2, HDMI3, HDMI4 USB1,
5 Head Phone out Depending on country
USB2, USB3, AV, Comp
6 Component Input Y/Pb/Pr Depending on country
HDMI1
HDMI HDMI2
7 PC / DTV Format Support HDMI2.1
Input HDMI3
HDMI4
8 Video Input RCA PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
9 Audio Input DVI Audio
10 SPDIF out (1 EA) Optical Audio out
11 USB Input (3 EA) EMF, For SVC (download)
Ethernet Connect
12 STP cable
(1EA)
PCMCIA Card slot
13 PCMCIA Slot only EU/CIS
(1EA)
-7- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5. External Input Format
5.1. HDMI
(1) DTV mode
No. Resolution H-freq(kHz) V-freq(kHz) Pixel clock(MHz) Proposed Remarks
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
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
20 1920*1080 134.86 119.88 296.7 UDTV 2160P
21 1920*1080 135 120 297 UDTV 2160P
22 3840*2160 53.95 23.98 296.7 UDTV 2160P
23 3840*2160 54 24 297 UDTV 2160P
24 3840*2160 56.25 25 297 UDTV 2160P Not Support for FHD.
25 3840*2160 61.43 29.97 296.7 UDTV 2160P
26 3840*2160 67.5 30 297 UDTV 2160P
27 3840*2160 112.5 50 594 UDTV 2160P
28 3840*2160 134.86 59.94 593.4 UDTV 2160P
29 3840*2160 135 60 594 UDTV 2160P
30 3840*2160 225 100 1188 UDTV 2160P
4K120 model (LM21U HDMI
31 3840*2160 269.73 119.88 1186.8 UDTV 2160P
3,4 port, O20N) or 8K model
32 3840*2160 270 120 1188 UDTV 2160P
33 4096*2160 53.95 23.98 296.7 UDTV 2160P
34 4096*2160 54 24 297 UDTV 2160P
35 4096*2160 56.25 25 297 UDTV 2160P
36 4096*2160 61.43 29.97 296.7 UDTV 2160P
Not Support for FHD.
37 4096*2160 67.5 30 297 UDTV 2160P
38 4096*2160 112.5 50 594 UDTV 2160P
39 4096*2160 134.86 59.94 593.4 UDTV 2160P
40 4096*2160 135 60 594 UDTV 2160P
41 4096*2160 225 100 1188 UDTV 2160P
4K120 model (LM21U HDMI
42 4096*2160 269.73 119.88 1186.8 UDTV 2160P
3,4 port, O20N) or 8K model
43 4096*2160 270 120 1188 UDTV 2160P
44 7680*4320 107.89 23.98 1188 8K
45 7680*4320 108 24 1188 8K
46 7680*4320 110 25 1188 8K
47 7680*4320 131.87 29.97 1188 8K
8K Model Only.
48 7680*4320 132 30 1188 8K
49 7680*4320 220 50 2376 8K
50 7680*4320 263.74 59.94 2376 8K
51 7680*4320 264 60 2376 8K
-8- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(2) PC mode
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 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
Support to HDMI-PC
8 1280*1024 63.98 60.02 109 SXGA
Not Support for FHD.
WUXGA(Reduced
9 1920*1080 67.5 60 158.4
Blanking)
10 1920*1080 134.86 119.88 296.7 UDTV 2160P
11 1920*1080 135 120 297 UDTV 2160P
12 3840*2160 53.95 23.98 296.7 UDTV 2160P
13 3840*2160 54 24 297 UDTV 2160P
14 3840*2160 56.25 25 297 UDTV 2160P
15 3840*2160 61.43 29.97 296.7 UDTV 2160P
16 3840*2160 67.5 30 297 UDTV 2160P
17 3840*2160 112.5 50 594 UDTV 2160P
18 3840*2160 134.86 59.94 593.4 UDTV 2160P
Not Support for FHD.
19 3840*2160 135 60 594 UDTV 2160P
20 4096*2160 53.95 23.98 296.7 UDTV 2160P
21 4096*2160 54 24 297 UDTV 2160P
22 4096*2160 56.25 25 297 UDTV 2160P
23 4096*2160 61.43 29.97 296.7 UDTV 2160P
24 4096*2160 67.5 30 297 UDTV 2160P
25 4096*2160 112.5 50 594 UDTV 2160P
26 4096*2160 134.86 59.94 593.4 UDTV 2160P
27 4096*2160 135 60 594 UDTV 2160P
(UHD 60Hz models only), Sup-
28 2560*1440 88.78 59.95 241.5 3K port only when UHD DeepColor
is On
(UHD, 8K 120Hz models only),
29 2560*1440 182.99 119.99 497.7 3K Support only when UHD Deep-
Color is On
-9- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SOFTWARE UPDATE
1. USB DOWNLOAD 2. NSU DOWNLOAD
(1) Insert the USB memory Stick to the USB port. (This Function is needed to connect to the internet.)
(2) Automatically detect the SW Version and show the below
message. (1) Menu → All Settings → Support → Software Update
(3) Click [YES]: initiate the download and install of the update. (2) Click [CHEK FOR UPDATES]: system check newest version.
(4) Click [Check Now]: move to “About This TV” page for update. (3) Click [DOWNLOAD AND INSTALL].
(5) TV is updating. (4) TV is updating.
(6) After finished the update, below Pop-up appear. (5) After finished the update, below Pop-up appear.
(7) Click [Yes] : TV will be DC OFF → ON. (6) Turn OFF the TV and On. Check the updated SW Version
(8) After TV turned on, Check the updated SW Version and and Tool Option.
Tool Option.
- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
1. E60
3.3V 1.1V 1.8V 0.95V
5V
13V 3.3V 3.5V 1.1V 3.5V 1.8V 13V 5V 13V 0.8V
Normal DDR DDR Normal DDR/C4TX
0.8V 1.8V 3.3V 1.1V 3.5V_ST 0.95V
0.8V 0.8V
X_TAL
13V 0.8V 13V 0.8V
LPDDR4 MICOM 50MHz 5V
Core CPU
16Gb
3.5V_ST P_TS_IN
1.8V 0.8V P_TS_OUT CI Slot
3.5V LPDDR4 LPDDR4 13V
13V 13V 13V
ST_BY 1.8V_AON 0.8V_AON 8Gb 8Gb 3.5V_ST
To
F20 Vx1 (16 lane) I2C_4 NVRAM (256Kb)
Vx1
F20 Vx1 OSD (8 lane) eMMC 3.3V
eMMC (8GB)
3.3V Vx1 CLK/DATA/STRB
20V 5V
1.8V
I2S_TW Out USB1 (2.0)
TW Audio AMP Main SoC
I2C 4 OCP USB2 (2.0)
3.3V E60
3.3V USB3 (2.0) From
20V
- 11 -
HDMI1 Power
Front Audio AMP I2S Out
HDMI2(eARC /ARC)
I2C 0 B/D
20V HDMI3
Wov CLK out / DataIn HDMI4
Woofer Audio AMP IR/Key IF
IQ (+/-), IP(+/-) IF (+/-)
IF_S 12V 3.3V
BLOCK DIAGRAM
TS
Copyright ©
tuner
SPDIF OUT
ETHERNET
USB_WIFI
I2C3 TUNER TUNER
6LJQDO)ORZ Sub Assy (T2/C/A)
H-
(S,S2)
6XSSO\3RZHU 3.5V_ST
,QRXW3RZHU LNB 13V
AMP
T2/C/S/S2 H-NIM
DVB-S Air/
MAX323
3.5V_ST Cable
MIC
IR / KEY
Only training and service purposes.
LAN
SPDIF
H/P
RS-232
To WIFI/BT
Combo
IR Blaster
Area OPT
LG Electronics Inc. All rights reserved.
2. F20
F20_1.8V_IO SHARE_3.3V F20_0.8V_CORE F20_0.8V_DDR
13V F20 13V F20 13V F20 13V F20 SHARE_3.3V F20_0.98V
1.8V 3.3V Core DDR DDR_PLL
To
Panel F20_0.98V
F20_1.1V_DDR F20_1.8V_LP4 DDR_PLL F20_ F20_ F20_
0.8V_DDR 1.8V_DDR 1.1V_DDR
SHARE_3.3V 1.1V SHARE_3.3V 1.8V 13V F20 X_TAL
DDR DDR DDR_PLL LPDDR4 LPDDR4 24MHz From
4Gb 4Gb Main SOC
Vx1 51P (16 lane) LPDDR4 Vx1 24 Lane
4Gb
F20_PWM_IN[0]
F20_PWM_OUT[0] FAN0
F20_PWM_IN[2]
F20_PWM_OUT[1] FAN1
F20_PWM_IN[4] Model OPT
F20_PWM_OUT[2] FAN2
Vx1 51P (16 lane) F20
F20_PWM_IN[6]
F20_PWM_OUT[2] FAN3
- 12 -
F20_SPI_S
F20_I2C
Vx1 51P (16 lane) From
TEMP Main SOC
F20_I2C Sensor
Copyright ©
F20_SPI_MF SPI
64Mbit
Vx1 51P (16 lane)
Only training and service purposes.
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.
410
420
400
900
HW1
100
540
700
570
LV2
LV3
LV4
LV1
500
HT1
HT2
HS1
120
HP1
121
531
830
530
AAH1
820
800
110
A10
AR2
810
200
- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
ASSEMBLY / DISASSEMBLY GUIDE
1. Back Cover Disassembling Guide
(3)
(3)
(1)/(2)
(1)/(2)
(1) Remove the Stand Cover 2 EA. (2) stand screw 4 EA(2-Pole 2 EA + 2 EA)
after Place on a flat pad.
(3) Remove a AV Cover / Wall Mount Cover.
Wall Mount Cover AV Cover
- 14 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(4) Remove the Screw 12 EA.
(5) Ready to open back cover after recognizing back cover latch point 20 EA.
(6) The latch for Back cover assembly is separated in the order of Side → bottom →
Center → Top .
4 4
3 3
1 1
2 2
- 15 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(7) Use the plastic scraper to first disassembly each latch on the left/right side.
Open the
Latch 1ea
Plastic scraper
(8) After separating the side and bottom latches, when separating the four central
latches, hold the back cover and lift it slightly up.
And disassembly the latches by pushing up on the close side to the latch on the
inside of the back cover.
- 16 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
* Back Cover Handling Guide
OK
- 17 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
2. Back Cover assembling Guide
(1) Place the Back Cover on SET.
(2) Push the back cover’s left side with (3) Push the back cover’s left side with
one-hand(Close the latch 10 EA(left) one-hand(Close the latch 10 EA(right)
from down to up direction). from down to up direction).
Click Click
OLED77ZX Latch 20 Point
(Push about 50mm above the hole.)
(4) Tighten the Screw 12 EA(Back side 8 EA + bottom side 4 EA)
- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(5)
(5)
(6)/(7)
(6)/(7)
(5) Tighten the AV Cover / Wall Mount Cover.
AV Cover Wall Mount Cover
(6) Tighten screw 4 EA(2-Pole 2 EA + 2 EA). (7) Tighten the Stand Cover 2 EA.
PUSH
PUSH
- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
TROUBLE SHOOTING GUIDE
Copyright © 2021 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 7~9
on/off
8 No audio/Normal video 10
C. Audio error
9 Wrecked audio/discontinuation/noise 11
10 Remote control & Local switch checking 12
11 PM21 operating checking 13
12 D. Function error
Wifi operating checking 14
13 External device recognition error 15
14 Voice Recognition function error 16
15 E. Noise Circuit noise, mechanical noise 17
16 F. Exterior error Exterior defect 18
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2021 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 1/18
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
☞A9 N
Move to No Repair Power
Check Power Board output to Module (23.5V)
video/No audio Board or parts
Normal Y Replace 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 © 2021 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 2/18
☞A9
No Video/ Check various voltages of Check and
Normal Y
No audio Power Board Board (Main) replace
(12V,20V) voltage?
MAIN B/D
N End
Replace Power
Board and repair
parts
2
Copyright © 2021 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 3/18
. 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 © 2021 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 4/18
☞A6 ☞ A7
※ Check and
Check color by input
replace Link
-External Input Y Y
Color Cable Color Color Y
-AV/Component Replace Main B/D 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 © 2021 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 5/18
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 Input device and cable
Check S/W Version -External Input
version error (Check normal operation of
-Component Screen N Replace Main
-HDMI/DVI External Input, Component, B/D, Module
normal?
Y RGB and HDMI/DVI by
Component connecting Jig, pattern
error Y
S/W Upgrade Generator ,Set-top Box etc.
Request repair for
external device
Connect other external
Normal N Y
device and cable
screen? (Check normal operation of
HDMI/ 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 © 2021 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 6/18
☞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 © 2021 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 7/18
Check outlet
☞A10
N Y
Check A/C cord Error? Check Power Off CPU End
Replace Main B/D Normal?
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 © 2021 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 8/17
* Please refer to the all cases which can be displayed on power off mode.
Power Off History Explanation Action contents
Power off by CPU Abnormal status
1. Power off (Last Cold, Last Cool, Last Warm)
Condition : When power on and checking Power on Mode, abnormality appears.
POWER_OFF_BY_CPU_ABNORMAL Check & Change Main B/D
2. Power off in CPU Abnormal Case (Exception)
- Release Mode : Reboot
- Debug/Event Mode : Power off
POWER_OFF_BY_CPUCMD Power off by main SoC command. Check & Change Main B/D
Case1 : Pipe line overflow
POWER_OFF_BY_ABN Check & Change Main B/D
Case2 : reboot to suspend Fail
Power off when TV is not turned off during a certain time
Result : micom force to trigger TV power off.
POWER_OFF_BY_KEYTIMEOUT Check & Change Main B/D
Condition : When pressing power key while power on/off status, CPU does not
response within 8 seconds or call the WDT timer API.
Power off by not detecting AC (abnormal case) Normal Case
POWER_OFF_BY_ACDET Result : micom triggers TV power off
Check & Change Main B/D
Condition : Power detect port drops to low while power on status.
Power off by not unstable AC power detect.
Result : micom check the stable power.
POWER_OFF_BY_5VMNT Check & Change Main B/D
Condition : When AC on or DC on, stabilization check routine (Power Detect High
Check) fail after multi power on.
Power off when receiving no ack
Debug Status : Release Mode
POWER_OFF_BY_NO_POLLING Result : TV power off/on (Reboot) Check & Change Main B/D
Condition : There is no I2C response from CPU for 15 seconds.
if warm standby, power off occurs.
similar with POWER_OFF_BY_KEYTIMEOUT, but different concept.
Result : micom force to trigger TV power off within 4 seconds.
POWER_OFF_BY_REMOTE_KEY2 Check & Change Main B/D
Condition : When TV power on/off, CPU does not response within 4 seconds,
and then pressing power key.
POWER_OFF_BY_INV_ERROR Power off by OLED module error Check & Change OLED Module
Result : Reboot
POWER_OFF_BY_ONRF_FAIL Check & Change OLED Module
Condition : OLED module compensation is running but fails.
POWER_OFF_BY_PNWASHFAIL Power off by panel noise wash function fail case. (OLED) Check & Change OLED Module
Power off by resume fail when dc on case.
POWER_OFF_BY_RESUME_FAIL Check & Change Main B/D
If occur the resume fail, TV will be rebooted.
8
Copyright © 2021 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 9/17
* Please refer to the all cases which can be displayed on power off mode.
Power Off list Explanation Action contents
POWER_OFF_BY_FAN_CTRL_ERROR Power off by FAN operation status. Check & Change FAN
POWER_OFF_BY_TEMPERATURE_SENSOR
Power off by Temperature Sensor operation status Check & Change MAIN B/D
_ERROR
Power off by Micom Reset
POWER_OFF_BY_RESET It's not recommend. Please use POWER_OFF_BY_REQUEST_RESET.
RESULT : Reset the TV and init time data.
POWER_ON_BY_REMOTE_KEY Power on by remote Power Key.
POWER_OFF_BY_OFF_TIMER Power off by Off timer
POWER_OFF_BY_SLEEP_TIMER Power off by sleep timer
POWER_OFF_BY_INSTOP_KEY Power off by Instop Key
Power off by auto off function
POWER_OFF_BY_AUTO_OFF 1. When it lasts for 15 minutes that no signal and no remote key input.
2. When screen mute status lasts for 2 hours.
Power off by On timer
POWER_OFF_BY_ON_TIMER
Power off when no remote and local key input for 2 hours after power on by On timer.
POWER_OFF_BY_RS232C Power off by RS232C command
Power off by reserved recording Normal Case
POWER_OFF_BY_RESREC Power off automatically after recording finishes after TV turns on by reservation
recording from power off status.
POWER_OFF_BY_SWDOWN Power off by software download
POWER_OFF_BY_LOCAL_KEY Power off by local key
Result : Power off
POWER_OFF_BY_COMP_END
Condition : OLED threshold voltage degradation completes.
POWER_OFF_BY_HDMI_CEC Power off by HDMI CEC command
POWER_OFF_BY_PNWASHSTART Power off for starting OLED panel noise function in warm state.
POWER_OFF_BY_PNWASHDONE Power off by panel noise wash function completed.
POWER_OFF_BY_COOLING Power off for cool down the OLED t-con.
POWER_OFF_BY_EDID_WRITE Power off by EDID write done.
9
Copyright © 2021 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 10/18
☞A11 ☞A12+A9
Check user menu N Check audio B+ Y
No audio Normal
→ 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
10
Copyright © 2021 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 11/18
→ 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
11
Copyright © 2021 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 12/18
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
12
Copyright © 2021 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 13/18
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
13
Copyright © 2021 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 14/18
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
14
Copyright © 2021 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 15/18
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
15
Copyright © 2021 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Error D. Function error
symptom
Voice Recognition Function Error 16/18
☞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
16
Copyright © 2021 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 17/18
Identify Circuit Check location
Replace PSU
nose type noise of noise
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)
17
Copyright © 2021 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 18/18
Zoom part with Module
Replace module
exterior damage damage
Cabinet
Replace cabinet
damage
Remote
control Replace remote control
damage
Stand
Replace stand
dent
18
Copyright © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 General Programmes
Programme Tuning Manual Tuning
When the signal is strong,
use the attenuator
(-10dB, -15dB, -20dB etc.)
A3
Copyright © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 within Vx1
CABLE Screen stop cable PIN
A - 2/10
Copyright © 2021 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 © 2021 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 © 2021 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
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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 © 2021 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 © 2021 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 © 2021 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 © 2021 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
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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 A8
ST-BY condition: On or Off
Power ON condition: Turn Off
A8
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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 7.8V A9
date
Check a voltage of DC 12VM Power To Main B’d
(ST-BY : 7.8V, Normal : 12V)
P201
P201
P202
P205
P204
Power To Module
P202 P204 P205
14 15
GND
13 14
12 13
11 12
23.5V
10 11
9 12V 10
8 9
23.5V(EVDD) 23.5V(EVDD) ON 8
7
23.5V(EVDD) OFF
6 7
23.5V(EVDD) ON -> 21.5V 23.5V(EVDD) ON -> 21.5V 5 6
23.5V(EVDD) OFF 5
4
GND 4 GND
3
2 3
1 2
1
A9
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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 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 © 2021 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 © 2021 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
② P201
P201
①
P7600
③ P5903
1 SPK_R-_FT P5903
2 SPK_R+_FT
3 SPK_L-_FT
4 SPK_L+_FT
5 SPK_R-_CT
6 SPK_R+_CT
7 SPK_L-_CT
8 SPK_L+_CT
Checking order when there is no audio
9 SPK_R-_TW
10 SPK_R+_TW
1.Check the contact condition of or 20V connector of Main Board. 11 SPK_L-_TW
2. Measure the 20V input voltage supplied from Power Board. 12 SPK_L+_TW
(If there is no input voltage, remove and check the connector.)
3.Connect the tester P5903 to the speaker terminal and if you hear the ‘Chik~ Chik~’
sound when you touch the GND and output terminal, the speaker is normal.
A12
Copyright © 2021 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
Eye IR LED 8 KEY2_JACK
9 EYE_SDA_JACK
10 WOV_PDM0_DATAIN_JACK
② 11 KEY1_JACK
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
25 F20_PWM_IN[4]
Checking order 26 GND
1. Check IR cable condition between IR & Main board.(Check picture number① and ②.) 27 F20_PWM_OUT[2]
2. Check the standby 3.5V on the terminal. (③) 28 +13V_FAN
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 © 2021 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 N.C.
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 25 F20_PWM_IN[4]
26 GND
Checking order 27 F20_PWM_OUT[2]
1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 28 +13V_FAN
2.Check the 3.5V_WIFI on the terminal 13, 19, 24 Pin
A14
Copyright © 2021 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 Settings
3. User Agreements Settings 4. Active ‘Use Hands-free Voice Control’
A15
Copyright © 2021 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 © 2021 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 © 2021 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 © 2021 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
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Only for training and service purposes.
