LG 42LN51XX / 42LN5100 / 42LN5110 / 42LN5120 / 42LN5130 (CHASSIS:LB35B) Service Manual ▷ View online
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Replace module
Zoom part with
exterior damage
Module
damage
Cabinet
damage
Replace cabinet
Replace remote controller
Remote
controller
damage
Stand
dent
Replace stand
F. Exterior defect
Exterior defect
Established
date
Revised date
14/14
LCD TV
Error
symptom
Standard Repair Process
2013. 02. 02
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Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
1
A. Video error_ No video/Normal audio
Check LCD back light with naked eye
A1
2
LED driver B+ measuring method
A2
3
Check White Balance value
A3
4
Power Board voltage measuring method
A4
6
A. Video error_ No video/Video lag/stop
TUNER input signal strength checking method
A5
7
LCD-TV Version checking method
A6
9
A. Video error_Color error
LCD TV connection diagram
A7
10
11
Check Link Cable (LVDS) reconnection
condition
condition
A8
A9
A9
12
Adjustment Test pattern - ADJ Key
A10
13
A. Video error_Vertical/Horizontal bar,
residual image, light spot
residual image, light spot
LCD TV connection diagram
A8
14
Check Link Cable (LVDS) reconnection
condition
condition
A8
A9
A9
15
Adjustment Test pattern - ADJ Key
A10
16
<Appendix>
Defected Type caused by T-Con/
Inverter/ Module
Defected Type caused by T-Con/
Inverter/ Module
Exchange T-Con Board (1)
A-1/5
17
Exchange T-Con Board (2)
A-2/5
18
Exchange LED driver Board (PSU)
A-3/5
19
Exchange Module itself (1)
A-4/5
20
Exchange Module itself (2)
A-5/5
Continue to the next page
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Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
21
B. Power error_No power
Check front display LED
A11
22
Check power input Voltage & ST-BY 3.5V
A12
23
Checking method when power is ON
A13
24
POWER BOARD voltage measuring method
A4
25
26
B. Power error_Off when on, off while
viewing
viewing
POWER OFF MODE checking method
A14
28
C. Audio error_No audio/Normal video
Checking method in menu when there is no
audio
audio
A15
29
Voltage and speaker checking method when
there is no audio
there is no audio
A16
30
C. Audio error_Wrecked
audio/discontinuation
audio/discontinuation
Voltage and speaker checking method in
case of audio error
case of audio error
A16
31
D. Function error_ No response in
remote controller, key error
remote controller, key error
Remote controller operation checking method
A17
Continued from previous page
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Standard Repair Process Detail Technical Manual
Check Back Light On with naked eye
A. Video error_No video/Normal audio
<ALL MODELS>
A1
Established
date
Revised
date
Error
symptom
Content
LCD TV
Power On -> disjoint back case -> check lighting from the module
2013. 02.15
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