Read LG 55SL8500-ZA (CHASSIS:LD91K) Service Manual online
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12. RGB No Video Problem
Check Signal format
Is it supported?
Check the RGB Cable
YES
MAIN B’D P400 Check
Replace MAIN B’D P400
YES
NO
NO
YES
Check MAIN B’D C208 (Video)
R246 (HSYNC)
R245 (VSYNC)
Replace
MAIN B’D C208 or R246 or R245
NO
Replace MAIN B’D IC 100
YES
MAIN B’D JK Pin #2
Video signal ?
R437 has Vsync ?
R440 has Hsync ?
R440 has Hsync ?
13. RGB No Color Problem
Check Signal format
Is it supported?
Check the RGB Cable
YES
MAIN B’D P400 Check
Replace MAIN B’D P400
YES
NO
NO
MAIN B’D P400
Pin #3 (BLUE)
Pin #2 (GREEN)
Pin #1 (RED)
Video signal ?
Check MAIN B’D C212 (RED)
C207 (GREEN)
C213 (BLUE)
Video Signal ?
Replace
MAIN B’D C212 or C207 or C213
YES
NO
Replace MAIN B’D IC 100
YES
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