LG 55LA7400 - Page 109

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Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section

Solder defect, Short/Crack

Fuse Open, Abnormal power section

Noise

GRADATION

Abnormal Display

Appendix : Exchange T-Con Board (2)

Only for training and service purposes

LGE Internal Use Only

Main Page

Contents2
Safety Precautions3
Important Safety Notice3
General Guidance3
Leakage Current Hot Check3
Servicing Precautions4
General Servicing Precautions4
Electrostatically Sensitive (ES) Devices4
General Soldering Guidelines4
IC Remove/Replacement5
Power Output, Transistor Device5
Diode Removal/Replacement5
Fuse and Conventional Resistor5
Specification6
Application Range6
Test Condition6
Test Method6
General Specification7
Supported Video Resolutions8
Component 2D Input8
Component 3D Input8
HDMI Input (PC/DTV)9
3D HDMI Input(1.4B)10
3D HDMI-PC Input10
3D HDMI Input(1.3)11
USB/DLNA Input12
3D Auto Detection12
3D Manual12
RF 3D Input(DTV)12
Adjustment Instruction13
MAIN PCBA Adjustments13
ADC Calibration13
Final Assembly Adjustment13
LAN Port Inspection14
EDID Download14
Edid Data14
Final Assembly Adjustment16
White Balance Adjustment16
Adjustment Command (Protocol)17
Manual Adjustment17
Auto WB Calibration17
Adjustment Method17
Option Selection Per Country18
Country Group Selection18
Tool Option Inspection18
Local Dimming Inspection19
Magic Motion Remote Controller Check19
Wi-Fi MAC Address Check19
Using RS232 Command19
3D Pattern Test20
HDMI ARC Function Inspection20
Ship-Out Mode Check20
AUDIO Output Check21
GND and HI-POT Test21
USB S/W Download21
Audio Input Condition21
Optional Adjustments22
Manual ADC Calibration22
Manual White Balance Adjustment22
Exploded View23
Content49
New Features53
EPI Interface54
EPI Interface (Mini-LVDS Vs. EPI)55
HF Mini-LVDS55
EPI (Embedded Clock P-To-P Interface)55
LCM (T-Con to S-Driver IC)55
Main PCB for Broadband58
MTK5398 Block Diagram60
Video/Audio in Block Diagram61
Audio out Block Diagram62
Hdmi63
Usb / Wifi / M-Remote / Uart64
Tuner/CI Block Diagram65
Panel Interface Block Diagram66
M13 I2C Block Diagram67
Interconnection69
Introductions of 13Y RF Assy + Magic Remote Control71
System72
Pairing Information Transmission (Send to TV after Paired)72
Pairing Information Transmission Sequence72
MR13 Block Diagram73
RF Pairing / Un-Pairing Method74
Introductions of 13Y WIFI Built in Assy75
WIFI Built in Assy Feature76
Block Diagram76
WIFI Built in Ass’y Specification77
12Y Widevine & HDCP 2.0 & NETFLX79
Widevine?80
Widevine Key80
Hdcp81
Why HDCP2.0?81
Netflix81
Dtcp82
Three Cryptographic Keys82
Repair Guide83
Contents of LCD TV Standard Repair Process84
Contents of LCD TV Standard Repair Process Detail Technical Manual85
Video Error86
No Video/ Normal Audio86
No Video/ no Audio87
Picture Problem88
Picture Broken/ Freezing88
Picture Problem (DVB-S/S2)89
Tuning Fail, Picture Broken/ Freezing89
Color Error90
Vertical/Horizontal Bar, Residual Image, Light Spot91
External Device Screen Error-Color Error91
Power Error92
No Power92
Off When On, off While Viewing, Power Auto On/Off93
Audio Error94
No Audio/ Normal Video94
Wrecked Audio/ Discontinuation/Noise95
General Function Problem96
Remote Control & Local Switch Checking96
External Device Recognition Error97
Function Error97
Noise98
Circuit Noise, Mechanical Noise98
Exterior Defect99
Video Error_No Video/Normal Audio101
Check White Balance Value101
Video Error_No Video/ Audio102
Power Board Voltage Measuring Method102
TUNER Input Signal Strength Checking Method103
Video Error_Video Error, Video Lag/Stop104
LCD-TV Version Checking Method104
Checking Method for Remote Controller for Adjustment104
LCD TV Connection Diagram105
TUNER Checking Part106
Adjustment Test Pattern - ADJ Key107
Video Error_Color Error107
Exchange T-Con Board108
Solder Defect, CNT Broken108
Exchange PSU(LED Driver)110
Exchange the Module111
Un-Repairable Cases111
Power Error _No Power113
Check Front Display LED113
Check Power Input Voltage and ST-BY 5V114
Checking Method When Power Is on115
POWER off MODE Checking Method116
Audio Error_No Audio/Normal Video117
Checking Method in Menu When There Is no Audio117
Checking Order When There Is no Audio118
Remote Controller Operation Checking Method119
VCOM Adjustment120
Sequence of the Vcom Adjustment120

LG 55LA7400 - Page 109

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