LG DV6812E4 Service Manual page 17

E. Picture abnormal
PICTURE ABNORMAL
Check the disc.
Refer to Servo part
If OK
Check MPEG_CLK Signal
of MPEG part
YES (If OK)
Check DSP
YES (If OK)
Check MPEG
YES (If OK)
Replace B/D
F. Disc Error
DISC ERROR
Check Disc
YES (If OK)
Refer to Servo part
YES (If OK)
Replace B/D
3-5