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42LH50YD (CHASSIS:LJ91C) - LG TV Service Manual (repair manual). Page 51

Read LG 42LH50YD (CHASSIS:LJ91C) Service Manual online

12. Component / RGB / AV Audio Trouble Shooting
Y
Check Jack JK700/JK703/JK704
N
Replace Jack
Check Video Output
N
Follow procedure external input 
video trouble shooting
Y
Check Signal
C204, C205
C206, C222
C210, C211
C217, C218
C220, C221
N
Replace IT
Y
Follow procedure All source 
audio trouble shooting
N
Maybe BCM3556 audio block has 
problems. Replace It
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