LG 42LB552A Manuals

Manuals and User Guides for LG 42LB552A. We have 1 LG 42LB552A manual available for free PDF download: Service Manual

LG 42LB552A Service Manual

LG 42LB552A Service Manual (59 pages)

Brand: LG | Category: TV | Size: 3.04 MB

Table of Contents

Contents
2
Safety Precautions
3
Important Safety Notice
3
General Guidance
3
Leakage Current Hot Check
3
Servicing Precautions
4
General Servicing Precautions
4
General Soldering Guidelines
4
IC Remove/Replacement
5
"Small-Signal" Discrete Transistor
5
Circuit Board Foil Repair
5
At IC Connection
5
Specification
6
Application Range
6
Requirement for Test
6
Model General Specification
6
Component Video Input
7
HDMI Input
7
HDMI Input (DTV)
8
Adjustment Instruction
9
Designation
9
EDID Download
9
Equipment
9
White Balance Adjustment
10
Adjustment Command (Protocol)
10
W/B Adj. Objective & How-It-Works
10
Adj. Condition and Cautionary Items
10
Tool Option Setting & Inspection
11
Ship-Out Mode Check
11
AUDIO Output Check
11
Audio Input Condition
11
USB S/W Download
12
Optional Adjustments
12
Manual ADC Calibration
12
Manual White Balance Adjustment
12
Block Diagram
13
Exploded View
14
Component / Av in / Av Audio out
15
I2C Control
16
Hdmi(Rear)
16
Usb(Side)
16
Ir/Led+Control
18
Video Error
23
No Video/ Normal Audio
23
No Video/ no Audio
24
Picture Broken/ Freezing
25
Tuning Fail, Picture Broken/ Freezing
26
Color Error
27
Vertical/Horizontal Bar, Residual Image, Light Spot
28
External Device Screen Error-Color Error
28
Power Error
29
No Power
29
Lcd Tv
29
Off When On, off While Viewing, Power Auto On/Off
30
Power Error
30
Audio Error
31
No Audio/ Normal Video
31
Wrecked Audio/ Discontinuation/Noise
32
Function Error
33
Remote Control & Local Switch Checking
33
Remote Control(R/C) Operating Error
33
External Device Recognition Error
34
Noise
35
Circuit Noise, Mechanical Noise
35
Exterior Defect
36
Contents of LCD TV Standard Repair Process Detail Technical Manual
37
Checking Method When Power Is on
38
Video Error_No Video/Normal Audio
39
Check Back Light on with Naked Eye
39
Inverter B+ 24V Measuring Method
40
Check White Balance Value
41
Power Board Voltage Measuring Method
42
LCD-TV Version Checking Method
43
LCD TV Connection Diagram
44
Check and Replace Link Cable(LVDS) and Contact Condition
45
Adjustment Test Pattern - ADJ Key
46
Exchange T-Con Board
47
Exchange PSU(LED Driver)
49
Exchange the Module
50
Power Error _No Power
52
Check Front Display LED
52
Check Power Input Voltage and ST-BY 3.5V
53
Edge LED
53
Checking Method When Power Is on
54
POWER off MODE Checking Method
55
Checking Method in Menu When There Is no Audio
56
Voltage and Speaker Checking Method When There Is no Audio
57
Checking Order When There Is no Audio
57
Remote Controller Operation Checking Method
58

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