Daewoo DDT-21H9ZDF(21") Service Manual page 61

C. Picture abnormal
C. Disc Error
PICTURE ABNORMAL
Check the disc.
Refer to Servo part
If OK
Check PLL IC of MPEG part
YES (If OK)
Check DSP
YES (If OK)
Check MPEG
YES (If OK)
Replace B/D
DISC ERROR
Check Disc
YES (If OK)
Refer to Servo part
YES (If OK)
Replace B/D
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Service Manual CP-099/FS