LG 34WN80C User manual
P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
P/NO : MFL69413820 (1908-REV00)
LED MONITOR
SERVICE MANUAL
LM20G
34WN80C 34WN80C-BK
- 2 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SPECIFICATION ....................................................................................... 4
BLOCK DIAGRAM ................................................................................... 7
EXPLODED VIEW .................................................................................... 8
TROUBLE SHOOTING GUIDE ................................................................ 9
TRANING MANUAL ................................................................. APPENDIX
CONTENTS
- 3 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
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
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
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 MΩand 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.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
SAFETY PRECAUTIONS
- 4 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SPECIFICATION
NOTE : Specications and others are subject to change without notice for improvement.
1. General Specication
9 Cable DisplayPort Length N/A
Weight
Color
HDMI
USB C To C Cable
Length 1.5±0.05 M Refer to BOM
Weight 0.09kg ± 10%
Color Black
Impedance 1) Cable : 100Ω±5Ω,
2) Connector : 100Ω±10Ω
Length 1.5±0.05 M Refer to BOM
Weight 0.062kg ± 10%
Color Black
Impedance 1) Cable : 90Ω±5Ω,
2) Connector : 90Ω±10Ω
10 Power Adapter / PSU /
LPB
Output: DC 19V 7.37A, 140W Adapter
Color: White, Weight : 0.58kg ±10%
Refer to BOM
11 Power Rating Input : DC 19V / 7.0A
12 Accessory Box -
8Power Code Length 1.55±0.05 M Refer to Suf-
power cord table
Weight
Color Black
Item Content Remark
1 Customer BRAND BRAND : LGE
Product
2 User Model Name 34WN80C
3 Sale region Worldwide
4Feature 34”LCD MONITOR (IPS Curved WQHD HDR)
5 Chassis Name LM20G PCB, Product
spec., Adjustment
spec.
6 General Scope External SW &Adj. Joystick switch Up / Down / Left / Right / OK
Function Picture Mode, Aspect Ratio, S.E.S, Six Color , On Screen
Control, HDR10,Dual Controller
7 Input HDMI IN HDMI1(1.4/2.0)/ HMDI 2(1.4/2.0)
DP IN DisplayPort(1.4/1.2/1.1) DisplayPort(1.4)->
for HDR function
DisplayPort(1.4/1.2/1.1),*PD 60W,USB
Data
*PD;Power delivery
USB-C IN
USB 3.0 Downstream x 2USB DN Do not support
Quick charging
H/P OUT Audio L/R
Request to
regulation team
0.174kg ± 10%
- 5 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
2.1.1. H/V Timing
No. Section Pol. Dot Clock
[MHz]
Frequency
[kHz]/[Hz]
Total
Period
(E)
Display
(A)
Front
Porch(D)
Sync.
(C)
Back
Porch(B)
Resolution
1 H(Pixels) - 25.175 31.469 800 640 16 96 48 640 x 480
V(Lines) - 59.94 525 480 10 2 33
2 H(Pixels) + 40 37.879 1056 800 40 128 88 800 x 600
V(Lines) + 60.317 628 600 1 4 23
3 H(Pixels) - 65 48.363 1344 1024 24 136 160 1024 x 768
V(Lines) - 60 806 768 3 6 29
4H(Pixels) + 79.99 54.347 1472 1152 32 96 192 1152 x 864
V(Lines) + 60.05 905 864 1 3 37
5 H(Pixels) + 74.25 45 1650 1280 110 40 220 1280 x 720
V(Lines) + 60 750 720 5 5 20
6 H(Pixels) - 83.5 49.702 1680 1280 72 128 200 1280 x 800
V(Lines) + 59.81 831 800 3 6 22
7H(Pixels) + 108 63.981 1688 1280 48 112 248 1280 x 1024
V(Lines) + 60.02 1066 1024 1 3 38
8 H(Pixels) +
V(Lines) +
9 H(Pixels) -
108 60 1800 1600 24 80 96 1600 x 900
V(Lines) +
60 1000 900 1 3 96
148.5 67.5 2200 1920 88 44 148 1920 x 1080
60 1125 1080 4 5 36
146.25 65.29 2240 1680 104 176 280 1680 x 1050
59.954 1089 1050 3 6 30
11 H(Pixels) +
V(Lines) -
12 H(Pixels) - 185.58 66.66 2784 2560 64 64 96 2560 x 1080
V(Lines) -
V(Lines) -
60 1125 1080 4 5 36
157.75 43.82 3600 3440 48 32 80 3440 x 1440
29.99 1461 1440 3 10 8
13 H(Pixels) +
265.25 73.68 3600 3440 48 32 80 3440 x 1440
V(Lines) -
49.99 1474 1440 3 10 21
319.75 88.82 3600 3440 48 32 80 3440 x 1440
59.97 1481 1440 3 10 28
14 H(Pixels) +
15(1) H(Pixels) +
V(Lines) -
* (1) DP / USB-C / HDMI Preferred timing
2. Signal Timing (Resolution)
2.1. Signal (Video & Sync)
- 7 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
BLOCK DIAGRAM
RTD2595LT
(Realtek) SPI
WQHD
Panel (3440 X 1440)
HDMI 1
DPRX, AUXN, HPD
HDMI 2
Key1, Key2
DDR2
SDRAM
LED Driver IC
MP3378E
Flash
Memory
(32MBIT)
TMDS // DDC // HPD
Joystick
(Control Key)
DP
TS3DV642
(Switch)
USB Type-C
EDID
EEPROM
HP Out
L/R Out
HP AMP
DP Signal
PD Controller
(MUX)
DP, USB 3.0
USB HUB
USB 3.0 UP
USB 2.0 DN for Billboard
CC communication
WLED_ENABLE
WLED_ADIM
Flash
Memory
(8MBIT)
SPI
( HDMI 2.0 )
E-DP
DC-DC
USB3.0 / 2.0 DN
VBUS=5V / 0.9A
Sub-Micom
(LPC11U68JBD48)
(DP1.4)
UART for HW Calibration
I2C for Scaler FW update
USB2.0 DN
USB 2.0 UP
I2C for PD Controller control
& PD FW update
VBUS=5V / 0.9A
PM IC
I2C for PD IC control
PD
Flash
Memory
(8MBIT)
SPI
DC-DC control
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
910
900
510
330
500
200
300
400
540
A3
- 9 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
TROUBLE SHOOTING GUIDE
1. No Power
Replace X200
N
Check JP600, JP601
Voltage Level (19V)
Check Power connector
OK ? Replace Adapter
Y
N Y
Check IC600, IC403, IC404 Output
Voltage Level (5V,1.8V, 1.15V)
Replace IC600, IC403, IC404
&Recheck
Y
N
Check X200 Clock
12MHz
Check IC601 Output
Voltage Level (+3.3V)
Replace IC601 &
Recheck
N
Y
Replace IC202 Flash Memory
Y
- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
2. No Screen on
Replace Cable
N
Module Back Light On? Check IC 601
Replace Main Scaler IC
Y
N N
Check Panel Power
10V(JP209)
Replace IC402 &
Recheck
Y
N
Check e-DP Cable for
Damage or Open
Conductors
Check WLED_ENABLE High?
(IC600, 601 Pin #27)
Replace T-Con Board or
Module
Y
- 11 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. No Display-HDMI
Replace Main Scaler (IC200)
Check input signal format
Is it supported?
Check JK100,JK10 1 for proper
connection or DamageReplace Connector
Y
N
Check HDMI 5V from Source(PC)
(JK100,JK101)
(Pin No. 18)
Y
Y
Check HDMI Cable for
Damage or Open Connector
Y
- 12 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
4. No Display-DP
Replace Main Scaler (IC200)
Check input signal format
Is it supported?
Check JK102 for proper
connection or DamageReplace Connector
Y
N
Y
Y
Check DP Cable for Damage
or Open Connector
Y
Check A UX Signal
(R137or R142)
- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5. No Sound(H/P)
Replace Main Scal er
(IC200)
Check the Input source.
Check the sound setting
in PC
Setting like a right
image.
Y
N
Check JK501 Soldering Do re-soldering
Y
N
Y
CheckCable status for
Damaged or Open
Connector
Y
- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
6. No Sound(Speaker)
Check the Input source.
Check Speaker Cable is
connected
Connect the Cable
correctl y
Y
N
Replace Speaker and
Check the status
Replace Main Scal er
(IC200)
N
Y
Check Cable for
Damaged or Open
Connector
Y
Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
34WN80C
SVC Training Manual
LGE Internal Use Only
Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
1.a. Model
Model Name
Model Name Chassis Size(inch) Market Analog
Broadcasting
DTV
Broadcasting
Data
Broadcasting
34WN80C LM20G 34” Amazon X XX
LCD Module
Name Resolution V Freq. Brightness 동적명암비 Back-Light Life-time
LM340UW3(SS)(A1) 3440 x 1440 60Hz(Rec.) 300cd/m² 5,000,000:1 WLED 30,000Hrs
Function
Picture Mode
Audio
Bluetooth Paring SPK Output(W)
Smart Energy Saving FreeSync 1ms Motion Blur
Reduction
XX
SPK Dolby Infinite
Surround
Clear
Voice II AVL
OXX XXXX X
Feature
3D PBP Super
Resolution+
Over
Drive DFC Black
Stabilizer
USB Quick
Charge USB
FW Update HDR10 Window10 Remo-con
XX OOOO X OOOX
Jack
Position RF AV In D-SUB HDMI USB Type
A
USB Type
CDP PC Audio
IN
Digital
Audio Out HP RS-232C
Back - - - 2 2 1 1 1 -
Side - - - - - - - - - - -
Size
(W x D x H)
Set W/O Stand Box
Weght
Set W/O Stand Box
814.0x569.5
x250.8
814.0x359.1
x92.9 8.0kg 6.3kg
Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
1.a. 모델 개요
Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
1.b. 모델 개요 – Design
Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
1.b. 모델 개요 – Design
Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
1.c. 모델 개요 - Accessory
2. 모니터 분해도
■ 분해도 -Head
Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
3. Chassis Assy
- Rear Frame (Common, Change Core)
- Speaker (Common)
- Side Cable cover, L (Common)
- Side Cable cover, R (Common)
- One Click Bracket, (Common)
2. Cabinet assy
-Cabinet (Common)
5. Backcover Assy
-. Backcover (New)
7. Stand Base Assy
-. Base Cover (34WL85C Common)
-. Base Casting (34WL85C Common)
-. Foot Rubber(Common)
1. Module
- 34” : LGD (34WL85C
Common)
4. IR PCB Assy
-. Joystick button (34WL85C Common)
-. Joystick PCB (34WL85C Common)
-. Button Bracket (34WL85C Common)
6. Stand Body Assy
-. Hinge Cover : 34WL85C Common
-. Others : 34WL85C Common
8. Cable
Holder
: 34WL85C
Common
Side Cable
Cover, L
Side Cable
Cover, R
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