Read LG 42LM3400 / 42LM340S / 42LM340T (CHASSIS:LD21C) Service Manual online
Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
1
A. Video error_ No video/Normal
audio
audio
Check LCD back light with naked eye
A1
2
LED driver B+ 24V 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
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
Check Link Cable (LVDS) reconnection
condition
condition
A8
A9
A9
11
Adjustment Test pattern -
ADJ Key
A10
12
A. Video error_Vertical/Horizontal bar,
residual image, light spot
residual image, light spot
LCD TV connection diagram
A8
13
Check Link Cable (LVDS) reconnection
condition
condition
A8
A9
A9
14
Adjustment Test pattern -
ADJ Key
A10
15
<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
16
Exchange T-Con Board (2)
A-2/5
17
Exchange LED driver Board (PSU)
A-3/5
55” : driver board
Other : PSU
Other : PSU
18
Exchange Module itself (1)
A-4/5
19
Exchange Module itself (2)
A-5/5
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