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Only for training and service purposes

CONTENTS

CONTENTS .............................................................................................. 2

PRODUCT SAFETY ................................................................................. 3

SPECIFICATION ....................................................................................... 4

ADJUSTMENT INSTRUCTION .............................................................. 10

BLOCK DIAGRAM .................................................................................. 19

EXPLODED VIEW .................................................................................. 20

SCHEMATIC CIRCUIT DIAGRAM ..............................................................

Service Manual1
Contents2
Safety Precautions3
Important Safety Notice3
General Guidance3
Leakage Current Hot Check Circuit3
Servicing Precautions4
Power Output, Transistor Device Removal/Replacement5
Diode Removal/Replacement5
"Small-Signal" Discrete Transistor Removal/Replacement5
IC Remove/Replacement5
Application Range6
Test Condition6
Test Method6
General Specification6
External Input Support Format8
Component Input(Y, CB/PB, CR/PR)8
HDMI Input (PC/DTV)9
Adjustment Instruction10
- Designation10
- Main Pcb Check Process10
- Total Assembly Line Process12
- Adjustment Preparation12
- DPM Operation Confirmation14
- DDC EDID Write (HDMI 256Byte)14
- Edid Data14
- Local Dimming Function Check17
- Outgoing Condition Configuration17
- GND & Hi-Pot Test17
- GND & HI-POT Auto-Check17
- 3D Function Test (Only 3D Model)18
Block Diagram19
Exploded View20
- TP for NON-EU Models(Except EU and China)21
- L13 Power Block22
- IR/LED and Control23
- Lvds (Non Eu)27
- GLOBAL Tuner Block Except EU and China30
- Ethernet33
- Audio Amp(Sta380Bwef)34
- Mstart Debug_4Pin35
- Rs-232C36
- Contents of LCD TV Standard Repair Process40
- Contents of LCD TV Standard Repair Process Detail Technical Manual41
- Standard Repair Process42
- Video Error42
- No Video/ Normal Audio42
- No Video/ no Audio43
- Picture Broken/ Freezing44
- Tuning Fail, Picture Broken/ Freezing45
- Color Error46
- Vertical / Horizontal Bar, Residual Image, Light Spot, External Device Color Error47
- Power Error48
- No Power48
- Off When On, off While Viewing, Power Auto On/Off49
- No Audio/ Normal Video50
- Wrecked Audio/Discontinuation/Noise51
- Remote Control & Local Switch Checking52
- External Device Recognition Error53
- Circuit Noise, Mechanical Noise54
- Exterior Defect55
- Check Back Light on with Naked Eye57
- Inverter B+ 24V Measuring Method58
- Check White Balance Value59
- Power Board Voltage Measuring Method60
- Video Error_No Video/ Audio60
- TUNER Input Signal Strength Checking Method61
- Video Error_Video Error, Video Lag/Stop61
- LCD-TV Version Checking Method62
- LCD TV Connection Diagram (1)63
- Check and Replace Link Cable(LVDS) and Contact Condition64
- Adjustment Test Pattern - ADJ Key65
- Exchange T-Con Board66
- Exchange PSU(LED Driver)68
- Exchange the Module69
- Check Front Display LED71
- Standard Repair Process Detail Technical Manual71
- Power Error _No Power71
- Check Power Input Voltage and ST-BY 3.5V72
- Checking Method When Power Is on73
- Power Error_Off When On, off Whiling Viewing74
- POWER off MODE Checking Method74
- Audio Error_No Audio/Normal Video75
- Checking Method in Menu When There Is no Audio75
- Voltage and Speaker Checking Method When There Is no Audio76
- Remote Controller Operation Checking Method77

Brand	LG
Model	42LA61 Series
Category	LED TV
Language	English

LG 42LA61 Series Service Manual

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LG 42LA61 Series Specifications

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