Read LG 42LB7DF (CHASSIS:LJ81A) Service Manual online
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Check video output
Y
Follow procedure external
input video trouble shooting
N
Check Connector
J700 / J702 (Component)
J703 (RGB)
J701 / P700 & cable (AV Rear, AV Side)
Replace connector
N
Y
Check signal
C734 / R746 / C735 / R752 (Component1)
C736 / R829 / C737 / R833 (Component2)
C733 / R837 / C732 / R838 (RGB)
C701 / R816 / C700 / R817 (AV Rear)
C729 / R858 / C728 / R859 (AV Side)
Replace it
N
Y
Check IC500 power L512 voltage level 9V
Replace it
N
Y
Check signal
R532 / R533 / C555 / R568 / C563 / R582
Replace it or IC500
N
Y
Check IC503 power L513 voltage level 9V
Replace it
N
Y
Check signal
C554 / R569 / R581 / C562
Replace it or IC503
N
Y
Check IC502 power L514 voltage level
3.3V & L515 voltage level 5V
Replace it
N
Y
Check IC502 power L514 voltage level
3.3V & L515 voltage level 5V
Replace it
N
Y
Check I2S signal
R548 / R549 / R550
Replace it or IC502
N
Y
Check Audio clock
R134
Replace it
N
Y
Maybe BCM3553 has problems
TROUBLESHOOTING
12. Component / RGB / AV Audio
12-2. Troubleshooting
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