Read LG 42SL90QD-SA (CHASSIS:LJ91L) Service Manual online
12. Component / RGB / AV Audio Trouble Shooting
Y
Check Jack JK208/JK209
N
Y
Check Signal
R235, R236 (Comp1)
R216, R217 (Comp2)
R216, R217 (Comp2)
R249, R250 (RGB)
R219, R221 (AV1)
R218, R220 (AV2)
R218, R220 (AV2)
at Jack Board
N
Replace Jack
Check Video Output
Replace one of
R235/R236/C231/C232 (Comp1)
R216/R217/C207/C208 (Comp2)
R216/R217/C207/C208 (Comp2)
R219/R221/C210/C212 (AV1)
R218/R220/C209/C211 (AV2)
R218/R220/C209/C211 (AV2)
R249/R250/C246/C247 (RGB)
& Recheck at Jack Board
N
Follow procedure external input
video trouble shooting
Y
Check Signal
C206, C210, C211, C232, C220,
C221, C224, C225, C226, C227
at Main Board
N
Y
Y
Follow procedure All source audio
trouble shooting
N
Maybe BCM3556 audio block has
problems. Replace It
Check cable between P203 at Jack
Board and P701 at Main Baord
N
Maybe Cable Pin has problems
Replace one of
R215/R228/C211/C232 (Comp1)
R229/R230/C220/C221 (Comp2)
R229/R230/C220/C221 (Comp2)
R204/R214/C206/C210 (AV1)
R231/R232/C224/C225 (AV2)
R231/R232/C224/C225 (AV2)
R233/R234/C226/C227 (RGB)
& Recheck at Main Board
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