LG 50UL3G User manual
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
Copyright © 2020 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.
P/NO : MFL71500378 (2006-REV00)
50UL3G 50UL3G-BJ
UW92J
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.................................................................................. 12
EXPLODED VIEW .................................................................................. 13
TROUBLE SHOOTING GUIDE ................................................ APPENDIX
- 3 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
WARNINGFORTHESAFETy-RELATEDCOMPONENT.
These parts are
marked on the Exploded View. It is essential that
these critical parts should be replaced with the
original parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
screen.
through wrist band.
WARNING
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
- 4 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Replaceable batteries
CAUTION
håndtering.
Levér det brugte batteri tilbage til leverandøren.
de la batterie.
Batterie
Entsorgung gebrauchter Batterien nach Anleitung
- 5 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
correctly installed.
7. Always connect the test receiver ground lead to the receiver
lead.
heat sink in this receiver.
charge on your body by touching a known earth ground.
prevent potential shock reasons prior to applying power to the
unit under test.
devices.
installed.
1. Use a grounded-tip, low-wattage soldering iron and appropriate
b. First, hold the soldering iron tip and solder the strand against
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
2. General Specication
No.
1 Input
-
tion
8/10/12bits
-
tion
8/10/12bits
-
tion
8/10/12bits
2.0
2.0
IR/Brightness
Inner IR
IR Receiver
Brightness sensor CM3232
LAN
-
- 8 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No
2 Output Built-in * Measured conditon
Output Power
Audio Out Output type
Output level
3
Feature
MM3286CFBE : 85 °C Protection Main Board-in
802.11ac, 802.11n
Beacon
-
able
4 Video
signal
Operating Fre-
All Inputs
5 LG Code
-
-
tivity, L/R
6
7
8
Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No
Min
8 sec
10
3s
11 30,000 50,000
12 340 425
13 Environ-
Condition
040 deg
10 80
-20 60 deg
5 85
14 Voltage(2 port) 2500Vac or 3540Vdc/1sec
Current
15 - °(degree) -
- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. Supporting Resolution (Signal Timing)
No. Pol.
Clock
Cycle
(E)
(A)
Front
Porch(B)
Back
Porch(F)
Resolution
1 40 1056 800 40 128 88 All inputs
V(Lines) 60.317 628 600 1 4 23
2 - 65 48.363 1344 1024 24 136 160
V(Lines) - 60 806 768 3 6
3 74.5 44.772 1664 1280 64 128
V(Lines) 748 720 3 5 20
4 108 1688 1280 48 112 248
V(Lines) 60.02 1066 1024 1 3 38
5 - 146.25 2240 1680 104 176 280
V(Lines) 1050 3 6 30
6 148.5 67.5 2200 88 44 88
V(Lines) 60 1125 1080 4 5 46
7 67.5 4400 3840 176 88
V(Lines) 30 2250 2160 8 10 72
8 135 4400 3840 176 88
V(Lines) 60 2250 2160 8 10 72
3.1. HDMI(PC Mode)
No. Resolution
1 31.5 60 480/60P O
2 31.25 50 576/50P O
3 37.5 50 720/50P O
4 45 60 720/60P O
5 28.1 50 1080/50i O
6 33.75 60 1080/60i O
7 56.25 50 1080/50P O
8 67.432 1080/60P O
67.5 60 1080/60P O
10 67.5 30 2160/30P
11 112.5 50 2160/50P
12 135 60 2160/60P
3.2. HDMI (DTV Mode)
- 11 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SOFTWARE UPDATE
1. USB Download
4) Updating is starting.
-
cally
stage)
- 12 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
BLOCK DIAGRAM
M16PP
USB2_0
USB2_1
USB1 (2.0) OCP
USB1 (2.0) OCP
HDMI3 HDMI 2.0
HDMI
Switch
HDMI2 HDMI 2.0
HDMI1 HDMI 2.0
PHY0_RX0N
PHY1_RX0N
PHY0_ARC OUT
PHY2_RX0N
PHY3_RX0N
LAN MII
AUDA_OUTL/R_CH1
AUDIO OUT OP AMP
SUB
ASSY
IR / Light Sensor/KEY
WIFI/BT Combo
USB2_2
MICOM (TI)
I2C I2C
Temp Sensor
I2C
I2C RTC
EEPROM
32Kb
IR/KEy1
Audio
AMP 10W x2EA
I2C
I2S
EyE_SDA/SCL
eMMC
LCD Module
4Gb(DDR3)×2
4Gb(DDR4)×2
: 16Gb (2GB)
Vby1
8GB
3,840 x 2,160 60P
RS-232C IN
RS-232C OUT
R1IN ROUT1
DOUT1 DIN1
R2IN
DOUT2 DIN2
ROUT2
M1
M4
M4
M1
MUX
UART_TX
UART_RX
MICOM
Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
400
540
LV1
570
800
530
121
HP1
HS1
HW1
900
120
500
200
905
820
Stand Screw
A10 700
AR1
100
EXPLODED VIEW
IMPORTANT SAFETy NOTICE
TROUBLE SHOOTING GUIDE
Copyright ⓒ2020 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 ⓒ2020 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
13.2 V Normal
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, Key Cable,,,)
1
Copyright ⓒ2020 LG Electronics Inc. All rights reserved.
Only training and service purposes.
Normal
voltage?
Check various voltages
of Power Board ( 13.2V)
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 ⓒ2020 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 ⓒ2020 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
Screen
normal?
End
Established
date
Revised date 4/13
Error
symptom
Standard Repair Process
☞A6 ☞A7
Check Test pattern
4
For other panel
Copyright ⓒ2020 LG Electronics Inc. All rights reserved.
Only training and service purposes.
B. Power error
No power
Power LED
On? Y
N
DC Power on
by pressing Power Key
On Remote control
Y
N
Normal
operation? Check Power
On ‘”High”
Check Power cord
was inserted properly
Check
Power LED Replace
Power
B/D
Measure Main Power voltage of each output of Power B/D
N
Y
Normal
voltage? Replace Main B/D
Y
OK?
Replace Main B/D
N
Y
Normal?
Check ST-BY 3.5V at Main B/D
Replace Power B/D
N
Y
Normal
voltage?
Replace Power
B/D
Y
☞A10
☞A4
☞A4
Standard Repair Process
Established
date
Revised date 5/13
Error
symptom
Close
5
Monitor Signage
Copyright ⓒ2020 LG Electronics Inc. All rights reserved.
Only training and service purposes.
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