Read LG 37LH50YD (CHASSIS:LB91B) Service Manual online
Check Signal format
Is it supported?
Check the RGB Cable
YES
MAIN B’D JK405 Check
Replace MAIN B’D JK405
YES
NO
NO
YES
Check MAIN B’D C2016 (RED)
C2017 (GREEN)
C2018 (BLUE)
Video Signal ?
Replace
MAIN B’D C2016 or C2017 or C2018
NO
Replace MAIN B’D IC 100
YES
MAIN B’D JK405
Pin #3 (BLUE)
Pin #2 (GREEN)
Pin #2 (GREEN)
Pin #1 (RED)
Video signal ?
Making
Revision
2009. 2 . 1
10/25
LCD TV
Symptom
RGB No Color Problem
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