LG 19LV250U - LCD TV Repair Guide

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LCD TV Repair Guide

`11 years New Basic Models

Contents

1. Product Roadmap

2. Main PCB layout

3. Block Diagram

4. Interconnection

5. Standard Repair Process

LCD TV EU Group

LCD TV Research Department

JAN. 28

th

, 2011

Table of Contents

Service Manual1
Contents2
Safety Precautions3
General Guidance3
Leakage Current Hot Check3
Important Safety Notice3
Servicing Precautions4
General Servicing Precautions4
Electrostatically Sensitive (ES) Devices4
General Soldering Guidelines4
"Small-Signal" Discrete Transistor5
Power Output, Transistor Device5
Circuit Board Foil Repair5
IC Remove/Replacement5
Application Range6
Requirement for Test6
Test Method6
Specification6
- Component Video Input7
- Rgb (Pc)7
- Hdmi Input8
- DTV Mode8
- PC Mode8
- Designation9
- Main PCB Check Process9
Adjustment Instruction9
- After Downloading10
- Adjust Sequence10
- Function Check10
- ADC Process10
- Total Assembly Line Process11
- W/B Equipment Condition11
- DDC EDID Write11
- DDC EDID Write (HDMI 256Byte)11
- Edid Data12
- Auto Download12
- Manual Download12
- HD RGB EDID Data12
- V-COM Adjust(Only LGD(M+S) Module)13
- Model Name & Serial Number D/L13
- Signal TABLE13
- Outgoing Condition Configuration13
- Local Dimming Function Check14
- CI+ Key Download Method14
Block Diagram15
Exploded View16
- S7M-Plus_Divx_Ms1017
- LCD TV Repair Guide38
- Main PCB41
- 19/22/26Lv250041
- 22/26Lk33042
- 32/37/42/47Lk45043
- 32/37/42/47/55Lw450044
- Interconnection46
- 19/22Lv250046
- 19/22Lv550047
- 26Lv250048
- 26Lv550049
- 32Lv250050
- 37Lv340051
- 37Lv355052
- 42Lv450053
- 42Lw450054
- 32Lk53055
- 37Lk43056
- 42Lk45057
- Sub PCB58
- Contents of LCD TV Standard Repair Process60
- Video Error61
- No Video/ Normal Audio61
- No Video/ no Audio62
- Picture Problem63
- Picture Broken/ Freezing63
- Color Error64
- Vertical/Horizontal Bar, Residual Image, Light Spot65
- External Device Screen Error-Color Error65
- No Power66
- Off When On, off While Viewing, Power Auto On/Off67
- No Audio/ Normal Video68
- Wrecked Audio/ Discontinuation/Noise69
- General Function Problem70
- Remote Control & Local Switch Checking70
- Function Error71
- External Device Recognition Error71
- Noise72
- Circuit Noise, Mechanical Noise72
- Exterior Defect73
- Contents of LCD TV Standard Repair Process Detail Technical Manual74
- Check LCD Back Light with Naked Eye76
- LED Driver/Lamp Inverter B+ 24V Measuring Method77
- Check White Balance Value78
- Power Board Voltage Measuring Method79
- TUNER Input Signal Strength Checking Method80
- LCD-TV Version Checking Method81
- Checking Method for Remote Controller for Adjustment81
- LCD TV Connection Diagram82
- TUNER Checking Part83
- Check Link Cable (LVDS) Reconnection Condition84
- Adjustment Test Pattern - ADJ Key86
- Exchange T-Con Board87
- Solder Defect, CNT Broken87
- Abnormal Power Section88
- Solder Defect, Short/Crack88
- DIM Light89
- Exchange PSU(LED Driver)89
- No Light89
- Panel Mura, Light Leakage90
- Press Damage90
- Crosstalk90
- Check Front Display LED92
- Check Power Input Voltage and ST-BY 3.5V93
- Check the 3.5V When St-By93
- Checking Method When Power Is on94
- POWER off MODE Checking Method95
- Checking Method in Menu When There Is no Audio96
- Voltage and Speaker Checking Method When There Is no Audio97
- Remote Controller Operation Checking Method98

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