LG DP450G Service Manual page 19

MAIN ELECTRICAL TROUBLESHOOTING GUIDE
C. AUDIO OUT ABNORMAL
Audio out abnormal
Check Audio jack & mode
Check A+5V
Check signals from MPEG
Replace IC(U502)
E. PICTURE ABNORMAL
Picture abnormal
Check the disc.
Refer to SERVO part
Check DCLK signal of MPEG part
Check MPEG (IC U201)
Replace B/D
YES
YES
YES
YES
YES
YES
YES
YES
YES
D. VIDEO OUT ABNORMAL
Video out abnormal
Check Video jack & mode
Check A+5V
Check signals from MPEG
Check IC(U502)
F. DISC ERROR
Check Disc
Refer to SERVO part
Replace B/D
3-12
YES
YES
YES
YES
Disc error
YES
YES
YES