LG 75UH5J-MP User manual

P/NO : MFL71897265 (2305-REV00)
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
Copyright © 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
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.
75UH5J 75UH5J-MP
UWA7B
LG Digital Signage

- 2 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
CONTENTS
CONTENTS .............................................................................................. 2
PRECAUTION........................................................................................... 3
SERVICING PRECAUTIONS.................................................................... 5
SPECIFICATION ....................................................................................... 7
SOFTWARE UPDATE............................................................................. 11
BLOCK DIAGRAM.................................................................................. 13
EXPLODED VIEW .................................................................................. 14
TROUBLE SHOOTING GUIDE ................................................ APPENDIX

- 3 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
WARNINGFORTHESAFETY-RELATEDCOMPONENT.
• There are some special components used in LCD
monitor that are important for safety. These parts are
marked on the Exploded View. It is essential that
these critical parts should be replaced with the
manufacturer' s specified parts to prevent electric
shock, fire or other hazard.
• Do not modify original design without obtaining written
permission from manufacturer or you will void the
original parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
• Must mount the module using mounting holes arranged
in four corners.
• Do not press on the panel, edge of the frame strongly or
electric shock as this will result in damage to the
screen.
• Do not scratch or press on the panel with any sharp
objects, such as pencil or pen as this may result in
damage to the panel.
• Protect the module from the ESD as it may damage the
electronic circuit (C-MOS).
• Make certain that treatment person' s body are grounded
through wrist band.
• Do not leave the module in high temperature and in
areas of high humidity for a long time.
• The module not be exposed to the direct sunlight.
• Avoid contact with water as it may a short circuit within
the module.
• If the surface of panel become dirty, please wipe it off
with a softmaterial. (Cleaning with a dirty or rough cloth
may damage the panel.)
WARNING
BE CAREFUL ELECTRIC SHOCK !
• If you want to replace with the new backlight or inverter
circuit, must disconnect the AC adapter because high
voltage appears at inverter circuit about 650Vrms.
• Handle with care wires or connectors of the inverter
circuit. If the wires are pressed cause short and may
burn or take fire.
Leakage Current Hot Check Circuit
PRECAUTION
1.5 Kohm/10W
0.15µF
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
When 25A is impressed between Earth and 2nd Ground
for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
CAUTION
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.

- 4 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
• Replaceable batteries
CAUTION
RISK OF EXPLOSION IF BATTERY IS REPLACED BY
AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO
THE INSTRUCTIONS.
REPLACE ONLY WITH THE SAME OR EQUIVALENT
TYPE.
ADVARSEL
Lithiumbatteri - Eksplosionsfare ved fejlagtig
håndtering.
Udskiftning må kun ske med batteri af samme
fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
ATTENTION
II y a danger d’explosion s’il y a remplacement incorrect
de la batterie.
Remplacer uniquement avec une batterie du même
type ou d’un type équivalent
recommandé par le constructeur.
Mettre au rebut les batteries usagées conformément
aux instructions du fabricant.
VORSICHT
Explosionsgefahr bei unsachgemäßem Austausch der
Batterie
Entsorgung gebrauchter Batterien nach Anleitung

- 5 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Test high voltage only by measuring it with an appropriate high
voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10% (by volume) Acetone and 90% (by
volume) isopropyl alcohol (90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques
should be used to help reduce the incidence of component
damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil
or comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500 ˚F to 600 ˚F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 ˚F to 600 ˚F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 ˚F to 600 ˚F)
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS

- 6 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
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.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

- 7 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SPECIFICATION
1. Application range
This specication is applied to the UWA7B chassis.
No. Item Specication Remarks
1 Input HDMI1 Maximum Resolution 3840x2160@60Hz * HDMI Cable Length Spec
- 3840X2160
60hz(594MHz) : 3m
- 3840X2160
30hz(297MHz) : 10m
- 1920X1080
60hz(148.5Mhz) : 15m
Recommend Resolution 3840x2160@60Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 4K@60/50Hz RGB444/YCbCr444, 8bits
YCbCr422 12bits
YCbCr420 8/10/12bits
4K@30/25Hz RGB444/YCbCr444, 8/10/12bits
YCbCr422 12bits
HDMI2 Maximum Resolution 3840x2160@60Hz
Recommend Resolution 3840x2160@60Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 4K@60/50Hz RGB444/YCbCr444, 8bits
YCbCr422 12bits
YCbCr420 8/10/12bits
4K@30/25Hz RGB444/YCbCr444, 8/10/12bits
YCbCr422 12bits
HDMI3(UH5J/
ML5K Only)
Maximum Resolution 3840x2160@30Hz
Recommend Resolution 3840x2160@30Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 4K@30/25Hz RGB444/YCbCr444, 8/10/12bits
YCbCr422 12bits
DP Maximum Resolution 3840x2160@60Hz * DP Version: 1.2a
Recommend Resolution 3840x2160@60Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 4K@60/50Hz RGB444/YCbCr444, 8bits
USB-C(UH7J
Only)
Maximum Resolution 3840x2160@60Hz * USB-C Alternate Mode(DP
Version: 1.2a)
Recommend Resolution 3840x2160@60Hz
HDCP Support HDCP2.2 &
HDCP1.4
Color Format & Depth 4K@60/50Hz RGB444/YCbCr444, 8bits
DVI Maximum Resolution 1920x1080@60Hz * Not support CTA Exten-
sion
Recommend Resolution 1920x1080@60Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 2K@60Hz RGB444, 8bits
OPS Maximum Resolution 3840x2160@30Hz * 98UH5J doesn't support
OPS input.
Recommend Resolution 3840x2160@30Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 4K@30/25Hz RGB444/YCbCr444, 8bits
YCbCr422 12bits
USB(2,UH7J)
(1,UH5J/ML5K)
USB Version 2.0(Type A(1), Type C(1,UH7J)) * Device: Memory stick,
Mouse, Service(F/W Down-
load)
Audio In Input Type Single Ended(Analog L/R Stereo) 3P, 3.5mm Phone Jack
Input level 0.7Vrms
RS232C In UART Comm. w/ IR Daisy Chain 4P, 3.5mm Phone Jack
2. General Specication

- 8 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No Item Specication Remarks
1IR/Bright-
ness
Sensor
Type External Box type , *External Dongle Type
(98UH5J)
5P, 3.5mm Phone Jack
IR Receiver
Brightness sensor CM3232 , TSL2572 (98UH5J)
LAN RJ45, 100Base-
T(100Mbps) only
SuperSign CMS / SuperSign
Control / SuperSign Control+
2 Output DP(UH7J Only) Maximum Resolution 3840x2160@60Hz SST(Single Stream Transmit)/
Daisy Chain
Recommend Resolu-
tion
3840x2160@60Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 4K@60/50Hz RGB444/YCbCr444, 8bits
Daisy Chain with HDCP Max 4 Sets
without HDCP More than 100 Sets
HDMI(UH5J/
ML5K Only)
Maximum Resolution 3840x2160@30Hz
Recommend Resolu-
tion
3840x2160@30Hz
HDCP Support HDCP2.2 & HDCP1.4
Color Format & Depth 4K@30/25Hz RGB444/YCbCr444, 8bits
YCbCr422 12bits
Daisy Chain with HDCP Max 4 Sets
without HDCP More than 100 Sets
Speaker Out Type Built-in * Measured conditon
- USB(Music) : - 9dB
- USB(Movie/AC3),
HDMI(Music): -12dB
- HDMI(PCM 2ch): -20dB
- DVI/PC Audio In: 0.7Vrms
Impedance Typ. 6Ω
Output mode BTL
Output Power 10W + 10W
Audio Out Output type Single Ended(L/R Stereo) 3P, 3.5mm Phone Jack
Output level Typ. 0.5Vrms ± 10%
Supporting mode O󰀨 / Fixed / Variable
RS232C Out UART Comm. w/ IR Daisy Chain 4P, 3.5mm Phone Jack
3Special
Feature
Temp. Sensor MM3286CFBE : 85 °C Protection Board-in
Acceleration
Sensor
Auto Rotation Board-in
Wi-Fi/BT Wi-Fi 802.11ac, 802.11n Built-in (LGSBWAC72)
BT Version 4.0, Support
Beacon
Media Player
Compatibility
OPS Ready KT-OPSH
External Media player Attachable
Logo Detachable Yes
4 Video
signal
Operating Fre-
quency
Horizontal frequency 30 - 83 kHz Ultra Deep Color O󰀨(3G)
All Inputs
30 - 136 kHz Ultra Deep Color On(6G)
HDMI1/2, DP
Vertical frequency 56 - 60 Hz DVI
58 - 62 Hz HDMI, DP, OPS
Synchronization Separate Sync, Digital
5Remote control Wireless Remote Control(Infrared Radiation) LG Code
REMOCON Working Sensitiv-
ity, Straight
Working Sensitivity, Straight Min. 12m
REMOCON Working Sensitiv-
ity, L/R
Working Sensitivity, L/R (30º) Min. 9m

- 9 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Min Typ Max
9 Power ON Screen Mute Time 8 sec
10 Standby Discharge Time On Condition : No more than 1s, O󰀨 Condition : No more than 3s
11 Module Life Time 30,000 50,000 Hrs
12 Uniformity 340 425 cd/m2
13 Environ-
ment
Condition
Operation Temperature 0 40 deg LGE Specication
Operation Humidity 10 80 % LGE Specication
Storage Temperature -20 60 deg LGE Specication
Storage Humidity 5 85 % LGE Specication
14 HI-Pot Test GND 1600Vac/1sec or2250Vdc/1sec for safety standard 62368-1
Signal 3000Vac/1sec or 4242Vdc/1sec
Current 100 mA(AC) / 10mA(DC)
15 Tilt(Facedown) 30° °(de-
gree)
in conditions within 30ºC tem-
perature, 50% humidity
No Item Remarks
6Local Key UP/DOWN, LEFT/RIGHT, ON/OFF Joystick
˄, ˅, + , - , √ , S , , Φ (UP/DOWN, LEFT/RIGHT, Auto/SET,
MENU, INPUT, ON/OFF) 8Key (Only Support
75/86/98UH5J-HP)
7Input Change Time HDMI 3.0 sec + 10% below 3840x2160@60Hz
(2160p@60Hz)
DVI 3.0 sec + 10% below 1920x1080@60Hz
(1080p@60Hz)
DP 3.0 sec + 10% below 1920x1080@60Hz
(1080p@60Hz)
DP/USB-C 3.0 sec + 10% below 3840x2160@60Hz
(2160p@60Hz)
8RTC Clock Accuracy ± 3sec during 24 hours

- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. Signal Timing (Supporting Resolution)
3.1. DVI/HDMI/DP/USB-C/OPS (PC Mode)
HDMI3 : UH5J Only, USB-C : UH7J Only
No. Section Pol. Dot
Clock
[MHz]
Frequency
[kHz]/[Hz]
Total
Cycle
(E)
Display
(A)
Front
Porch(B)
Sync.
(D)
Back
Porch(F)
Resolution Support
1H(Pixels) + 40 37.879 1056 800 40 128 88 800 x 600 O
V(Lines) + 60.317 628 600 1 4 23
2H(Pixels) - 65 48.363 1344 1024 24 136 160 1024 x 768 O
V(Lines) - 60 806 768 3 6 29
3H(Pixels) + 74.5 44.772 1664 1280 64 128 192 1280 x 720 O
V(Lines) + 59.855 748 720 3 5 20
4H(Pixels) + 108 63.981 1688 1280 48 112 248 1280 x 1024 O
V(Lines) + 60.02 1066 1024 1 3 38
5H(Pixels) - 146.25 65.29 2240 1680 104 176 280 1680 x 1050 O
V(Lines) + 59.954 1089 1050 3 6 30
6H(Pixels) + 148.5 67.5 2200 1920 88 44 88 1920 x 1080 O
V(Lines) + 60 1125 1080 4 5 46
7H(Pixels) + 297 67.5 4400 3840 176 88 296 3840 x 2160 HDMI1/2/3, DP/
USB-C
OPS
V(Lines) + 30 2250 2160 8 10 72
8H(Pixels) + 594 135 4400 3840 176 88 296 3840 x 2160 HDMI1/2, DP/
USB-C
V(Lines) + 60 2250 2160 8 10 72
No. H-freq(kHz) V-freq(Hz) Remarks Resolution Support
1 31.5 60 EDTV 480p 480/60P O
2 31.25 50 EDTV 576p 576/50P O
3 37.5 50 HDTV 720p 720/50P O
4 45 60 HDTV 720p 720/60P O
5 28.1 50 HDTV 1080i 50Hz 1080/50i O
6 33.75 60 HDTV 1080i 60Hz 1080/60i O
7 56.25 50 HDTV 1080P 50Hz 1080/50P O
8 67.432 59.94 HDTV 1080P 60Hz 1080/60P O
967.5 60 HDTV 1080P 60Hz 1080/60P O
10 67.5 30 UD 2160P 30Hz 2160/30P HDMI1/2/3, DP, OPS
11 112.5 50 UD 2160P 50Hz 2160/50P HDMI1/2, DP
12 135 60 UD 2160P 60Hz 2160/60P HDMI1/2, DP
3.2. HDMI/DP/OPS(DTV Mode)
HDMI3 : UH5J Only
USB-C Port can not support DTV resolution

- 11 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SOFTWARE UPDATE
1. USB Download
*Caution
Do not use auto update given by USB when inserting USB.
Press the Exit button (In the remote control)
If current version is 3.00.25 or earlier than 3.00.25, Software upgrading should be done to between 3.00.26 and 3.00.41.
And then, Software upgrade should be done with the latest one.
1) Make ‘LG_MONITOR’ folder in the USB drive.
2) Copy the download le to the ‘LG_MONITOR’ folder of the USB device. The Monitor system searches only the ‘LG_MONITOR’
folder to nd the download les. If there are many other les in the folder, it takes a long time to nd the download le.
3) Connect the USB device to the USB port on the Signage.
4) Push menu button, enter ‘All Settings’ menu. Go to ‘General’ menu.
Update file naming rule
•Software update file name

- 12 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5) Press number “7” seven times.
6) Enter Ext.Micom URSA. Press ‘UPDATE’
7) Finish

- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
BLOCK DIAGRAM
IC101 Cortex-A53 1.05GHz
Quad Core
AUDIO OUT
HDMI2
DVI
DP
RX1
RX2
HDMI1
Video Switch
IC5017
Tx0
LAN IN
MICOM (RENESAS)
IC3208
I2C I2C
Acceleration Sensor Temp Sensor (MM3286CFBE)
UTP
IR / Illuminance Sensor
IR
Audio AMP
(SYVL64)
SPK (External)
20W (10W x2EA)
eMMC
EYE_SDA/SCL
4Gb (DDR3) ×4 : 16Gb (2GB)
Vby1
eMMC
M0 M1
I2C
I2C
PHY
I2C
I2S
DAC
USB 2_3
16GB
Rx0
Rx2
Rx3
OP AMP
Rx1
AUDIO IN
LCD Module
500cd/㎡
3,840 x 2,160 60P
I2C
8-Key
RTC
M41T00M6F
EEPROM
32Kb
4분할
RX3
RX0
Demux
EEPROM
AUAD_CH2
MAX3232
RS-232C IN RS-232C OUT
R1IN ROUT1
DOUT1 DIN1
R2IN
DOUT2 DIN2
ROUT2
M1
M4
M4
M1
SN74LV
UART_TX
UART_RX
MICOM
OPS SEL[1:0]
SEL[1:0] Connection Connection
00 Normal RS232C In to Soc 01 Clone 10 OPS OPS to Soc
Vby1 DATA/CLK
VCC Load
Switch
TSL2572
Mux
HDMI3
Demux
MCDP2850
(DP To HDMI Converter)
HDMI OUT
Tx1
Demux
Wafer 51P
USB 2.0 USB2_0
OCP
Vby1 8 Lane

Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
EXPLODED VIEW
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.
IMPORTANT SAFETY NOTICE
AR1
700
100
HP1
530
820
121
120
570
710
542
500
510
541
600
HT1
LV2
LV1
HS1
HR1
HC1
HW1
750
200
400
401
850
540

TROUBLESHOOTING GUIDE
Copyright ⓒ2023 LG Electronics Inc. All rights reserved.
Only training and service purposes.

Contents of Standard Repair Process
No. Error symptom (High category) Error symptom (Mid category) Page Remarks
1
A. Video error
No video/Normal audio 1
2 No video/No audio 2
3 Color error 3
4Vertical/Horizontal bar, residual image,
light spot, external device color error 4
5
B. Power error
No power 5
6Off when on, off while viewing, power
auto on/off 6
7
C. Audio error
No audio/Normal video 7
8 Wrecked audio/discontinuation/noise 8
9
D. Function error
Remote control & Local switch checking 9
10 Wifi operating checking 10
11 External device recognition error 11
12 E. Noise Circuit noise, mechanical noise 12
13 F. Exterior error Exterior defect 13
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright ⓒ2023 LG Electronics Inc. All rights reserved.
Only training and service purposes.

Normal
audio Y
N
Move to No
video/No audio
No video
Normal audio Check Back Light
On with naked eye On Y
N
Check Power Board
12 VNormal
voltage Y
N
Replace T-con Board
or module
And Adjust VCOM
Repair Power Board
or parts
Check Power Board LED B+ Voltage
(LED B+ voltage depends on Power BD Spec)
Normal
voltage YReplace Inverter
or module
N
Repair Power
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board Replace Main Board Re-enter White Balance value
※Precaution
Established
date
Standard Repair Process
Revised date 1/13
Monitor Signage Error
symptom A. Video error
No video/ Normal audio
☞A4☞A1
☞A2
☞A5 & A3
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, Power Cable, EPI Cable, FFC VBY1 Cable, Wi-Fi Cable, Speaker Cable, Key Cable etc)
1
Copyright ⓒ2023 LG Electronics Inc. All rights reserved.
Only training and service purposes.

Normal
voltage?
Check various voltages
of Power Board ( 12V)
No Video/
No audio
Check and
replace
MAIN B/D
Y
Replace Power
Board and repair
parts
NEnd
Standard Repair Process
A. Video error
No video/ No audio
☞A4
Established
date
Revised date 2/13
Error
symptom
2
Monitor Signage
Copyright ⓒ2023 LG Electronics Inc. All rights reserved.
Only training and service purposes.

Color
error?
Y
N
※Check and
replace Link
Cable
(EPI or Vx1
Cable) and
contact
condition
Y
N
Replace Main B/D
Color
error?
Check error
color input
mode
Check color by input
-External Input
-HDMI
Y
External device
/Cable
normal
External Input/
Component
error
Check
external
device and
cable
Y
External device
/Cable
normal
HDMI
error
Check external
device and
cable
Replace Main/T-con B/D
Replace Main/T-con B/D
N
N
A. Video error
Color error
☞A6
N
Y
End
Replace module
Request repair
for external
device/cable
Color
error?
Check Test pattern
☞A8
☞A7
Standard Repair Process
Established
date
Revised date 3/13
Error
symptom
3
Copyright ⓒ2023 LG Electronics Inc. All rights reserved.
Only training and service purposes.

Screen
normal?
N
YCheck
external
device
connection
condition
Y
N
Check and
replace Link
Cable
Normal?
Y
N
Screen
normal? Replace Main/T-con
B/D
Replace
module
Check color condition by input
-External Input
-HDMI
End
Vertical/Horizontal bar, residual image, light spot
Request
repair for
external
device
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
☞A8
External device screen error-Color error
External
Input
error Connect other external
device and cable
(Check normal operation
of External Input,
Component, RGB and
HDMI/DVI by connecting
Jig, pattern
Generator ,Set-top Box
etc.
N
Y
Replace
Main/T-con
B/D
Screen
normal?
Check screen
condition by
input
-External Input
-Component
-HDMI/DVI
Request repair for
external device
Component
error
HDMI/
DVI
Connect other external
device and cable
(Check normal operation
of External Input,
Component, RGB and
HDMI/DVI by connecting
Jig, pattern Generator ,Set-
top Box etc.
Replace
Main /T-con
B/D
Screen
normal?
N
Y
Check S/W Version
Y
N
Check
version
S/W Upgrade
Y
N
Normal
screen?
End
Y
N
Replace Main
B/D
For LGD panel
Replace
Module
End
Established
date
Revised date 4/13
Error
symptom
Standard Repair Process
☞A6 ☞A7
Check Test pattern
4
For other panel
Screen
normal?
Copyright ⓒ2023 LG Electronics Inc. All rights reserved.
Only training and service purposes.