LG DP271, DP271B, LPA-837 Service Manual page 20

MAIN ELECTRICAL TROUBLESHOOTING GUIDE
F. PICTURE ABNORMAL
Picture abnormal
Check the disc.
Refer to SERVO part
Check MPEG_CLK
Signal of MPEG part
Check MPEG (IC U201)
Replace B/D
H. OPEN/CLOSE ABNORMAL
OPEN/CLOSE abnormal
Check SW401, SW402 switch
Check IC(U201) Pin 130
Refer to SERVO part.
YES
YES
YES
(If OK)
YES
YES(If OK)
YES
YES
YES
YES
G. DISC ERROR
NO
Check the connectin of MD.
Refer to SERVO part.
3-13
Disc error
YES
Check Disc
YES
YES(If OK)
Refer to SERVO part
YES
YES(If OK)
Replace B/D
YES