Read LG 42LG70YD (CHASSIS:LJ83A) Service Manual online
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Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure digital TV video
trouble shooting
N
N
Maybe BCM3553(2) internal audio DSP
has problems. Replace it
Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure analog TV video
trouble shooting
N
N
Maybe BCM3553(2) audio block has
problems. Replace it
Check L817 voltage level 5V
Replace it
N
Y
Check SIF signal
C801 / C806 / Q800
Replace it
N
Y
Check SIF signal
R652 / C665
Replace it
N
Y
10. Digital TV Audio
11. Analog TV Audio
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