LG DP351G Service Manual page 19

MAIN ELECTRICAL TROUBLESHOOTING GUIDE
C. AUDIO OUT ABNORMAL
Audio out abnormal
YES
Check Audio jack & mode
YES
Check A+5V
YES
Check signals from MPEG
YES
Replace IC(U502)
E. PICTURE ABNORMAL
Picture abnormal
YES
Check the disc.
YES
Refer to SERVO part
YES
Check DCLK signal of MPEG part
YES
Check MPEG (IC U201)
YES
Replace B/D
LGE Internal Use Only
D. VIDEO OUT ABNORMAL
Video out abnormal
Check Video jack & mode
Check A+5V
Check signals from MPEG
Check IC(U502)
F. DISC ERROR
Refer to SERVO part
Replace B/D
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YES
YES
YES
YES
Disc error
YES
Check Disc
YES
YES
Only for training and service purposes