Main
LCD TV SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LD91A
MODEL : 32LD320 MODEL : 32LD320N 32LD320N-ZA
CONTENTS
SAFETY PRECAUTIONS
General Guidance
1.5 Kohm/10W
Before returning the receiver to the customer,
Leakage Current Cold Check(Antenna Cold Check)
SERVICING PRECAUTIONS
Page
SPECIFICATION
1. Application range
2. Requirement for Test
3. Test method
4. Component Video Input (Y, CB/PB, CR/PR)
5. RGB (PC)
6. HDMI Input (PC/DTV)
(2) PC Mode
(1) DTV Mode
ADJUSTMENT INSTRUCTION
1. Application Range
2. Designation
3. Main PCB check process
* Boot file Download
3.1. ADC Process
3.2 Function Check
- 9 -
4. Total Assembly line process
4.1. Adjustment Preparation
* Manual W/B process using adjusts Remote control.
4.2. DDC EDID Write (RGB 128Byte )
4.3. DDC EDID Write (HDMI 256Byte)
- Auto Download
- Manual Download
4.5. V-COM Adjust(Only 37/42/47LH4000-ZA)
4.6. Outgoing condition Configuration
4.7. Internal pressure
5. Serial number D/L
5.1. Signal TABLE
5.2. Command Set
5.3. method & notice
- 13 -
EXPLODED VIEW
IMPORTANT SAFETY NOTICE
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
IC103 W25X32VSSIG
2009.03.25
MODEL OPTION
POWER DETECT
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
+3.3V
2009.03.25
AUDIO OUT
AUDIO IN
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
IC301 H5PS5162FFR-S6C
2009.03.25
DDR2
3 11
AV (OPT:SIDE_AV)
REAR USB (OPT:REAR_USB)
SPDIF OPTIC JACK
SIDE USB (OPT:SIDE_USB)
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
DVB-CI DETECT
PCMCIA
5 11
IC502 74LVC541A(PW)
SIDE HDMI (OPT:SIDE_HDMI)
(OPT:REAR_HDMI_2EA)
HDMI_CEC
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
IC700 TPA6110A2DGNRG4
EARPHONE AMP
MCLK SDATA WCK BCK TP is necessory
Monitor0_1_2 TP is necessory
Copyright 2009 LG Electronics. Inc. All right reserved.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
Stand-by +3.3V
FROM LIPS & POWER B/D
S6 core 1.26 volt
+5V
50 mA
SCART2 PIN 8 Scart Audio Mute Audio Out Amp
TU1200 TDFW-G235D
2009.03.25
DVB-CI DETECT
TUNER
10 11
Tuner PLL : 0xC2
Small
MODULE&CTL
11 11
LVDS_MNT_HD_19~22
LVDS_HD_19~22
Page
Block Diagram
L/R
- 19/22/26/32/37/42LH2000 - 32/37/42/47LH3000 - 32/37/42/47LH4000
Mstar S6
LGE3368A (No-DVIX) (IC100)
LVDS (10 bit)
Block diagram
37 GIP Block Diagram
Block diagram
*M+S : Main B/D + T-con B/D
In different
42/47 Normal Block Diagram
Only for 42/47LH4000
Block diagram
*M+S : Main B/D + T-con B/D
Page
date
Revised date
1/13
No video/ Normal audio
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
1
Page
A. Picture Problem
Menu Setup Booster
Color error
LGD Module Only
Other Module
date Revised date
4/13
Vertical/Horizontal bar, residual image, light spot
Vertical / Horizontal bar, residual image, light spot, external device color error
5/13
External device screen error-Color error
device and cable
B. Power error
B. Power error
Off when on, off while viewing, power auto on/off
7/13
date Revised date
* Please refer to the all cases which can be displayed on power off mode.
C. Audio error
Wrecked audio/discontinuation/noise is same after Check input signal compared to No audio
C. Audio error
9/13
Wrecked audio/ discontinuation/noise
date Revised date
9
D. General Function Problem
1. Remote control (R/C) operating error
2. Local(Mechanical) switch operating error
D. Function error
E. Noise
<With Inverter Module> <Without Inverter Module>
12
F. Exterior defect
LCD TV Repair Process Index
- Trouble shooting by input block (Component level check)
Making Revision
1/34
LCD TV Symptom Power-Up Boot Fail
26~42LH2000 32~47LH3000/LH4000
Making Revision
LCD TV Symptom Power-Up Boot Fail
19~22LH2000
2/34
Page
LCD TV Symptom No OSD
LCD TV Symptom Digital TV Video Problem
LCD TV Symptom Analog TV Video Problem
LCD TV Symptom AV1(Scart CVBS) No Video Problem
LCD TV Symptom AV1(Scart RGB) No Video
LCD TV Symptom AV2 No Video Problem
LCD TV Symptom AV3(CVBS) No Video Problem
LCD TV Symptom AV1 No Video Out Problem
LCD TV Symptom AV2 No Video Out Problem
LCD TV Symptom Component No Video/ No Color Problem
LCD TV Symptom RGB No Video Problem
LCD TV Symptom RGB No Color Problem
LCD TV
LCD TV Symptom HDMI1 or 2 or 3 No Video
Making Revision
18/34
LCD TV Symptom All Source no Audio Problem
26~42LH2000 32~47LH3000/LH4000
LCD TV Symptom Digital TV No Audio Problem
LCD TV Symptom Analog TV No Audio Problem
LCD TV Symptom AV1 No Audio Problem
LCD TV Symptom AV2 No Audio Problem
LCD TV Symptom AV3 No Audio Problem
Page
LCD TV
LCD TV Symptom HDMI-DTV No Audio Problem
LCD TV Symptom AV1 No Audio Out Problem
LCD TV Symptom AV2 No Audio Out Problem
LCD TV Symptom Headphone No Audio Problem
LCD TV Symptom SPDIF No Audio Problem
LCD TV Symptom USB No Connect Problem
Page
LCD TV Symptom Remote Control Problem
LCD TV Symptom Intelligent Sensor Problem
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FORTHE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.