Read LG 47SL90QD-AA (CHASSIS:LB91L) Service Manual online
Making
Revision
2009. 2 . 1
9/25
LCD TV
Symptom
RGB No Video Problem
Check Signal format
d
Revision
Is it supported?
Check the RGB Cable
YES
MAIN B’D JK405 Check
Replace MAIN B’D JK405
YES
NO
MAIN B’D JK405 Pin #2
Video signal ?
R446 has Vsync ?
R447 h H
?
NO
NO
YES
Ch k MAIN B’D C207 (Vid )
R447 has Hsync ?
Check MAIN B’D C207 (Video)
R2030 (HSYNC)
R2031 (VSYNC)
Replace
MAIN B’D C207 or R2030 or R2031
NO
YES
Replace MAIN B’D IC 100
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