LG 42LN52XX / 42LN5200 / 42LN5204 (CHASSIS:LD36M) Service Manual ▷ View online
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Standard Repair Process Detail Technical Manual
Inverter B+ 24V measuring method
A. Video error_No video/Normal audio
A2
Established
date
Revised
date
Error
symptom
Content
LCD TV
Measure DC
85_175V
applying to Module from Power Board.
Output
85~175V
from Power Board -> supply to Module.
Check Pin contacting statement and connection statement.
<ALL MODELS>
2013. 01 .09
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Entry method
1. Press the ADJ button on the remote controller for adjustment.
2. Enter into White Balance of item 9.
3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-
enter the value after replacing the MAIN BOARD.
Standard Repair Process Detail Technical Manual
Check White Balance value
A. Video error_No video/Normal audio
<ALL MODELS>
A3
Established
date
Revised
date
Error
symptom
Content
LCD TV
2013. 01 .09
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Standard Repair Process Detail Technical Manual
Power Board voltage measuring method
A. Video error_No video/ Audio
A4
Established
date
Revised
date
Error
symptom
Content
LCD TV
Check the DC 24V (L421)
2013. 01 .09
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MENU => Press red key Remote controller=>signal test
=> Select channel
When the signal is strong, use the
attenuator (-10dB, -15dB, -20dB etc.)
Standard Repair Process Detail Technical Manual
TUNER input signal strength checking method
A. Video error_Video error, video lag/stop
<ALL MODELS>
A5
Established
date
Revised
date
Error
symptom
Content
LCD TV
2013. 01 .09
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