Daewoo DV6T712D Service Manual page 21

TROUBLESHOOTING
A. c. DVD E-E
No sound in DVD E-E
mode.
Is there Audio at IC253
pin#1,13 in DVD mode?
YES
Is DVD Audio signal output
at IC253 pin#14,15?
YES
Is there DVD Auido at IC252
pin#5,14?
YES
Is DVD Audio signal output at
IC252 pin#3,13?
YES
C at Q904 is L or H?
L
Check Output JACK.
Is 12V obtained at IC253
NO
pin#16?
IC601 pin#32 is H?
Is 8V obtained at IC253
pin#10,11?
Replace IC253
NO
NO
IC601 pin#27
H
Check
H
A.Mute is L
IC601.
or H?
L
Check Q904,
Q905, R937,
R938, R939
Check OP-AMP block.(A. e2)
NO
Check POWER circuit
NO
Check IC601.
NO
Check R646, R647
Check signal flow circuit from
IC253 IC252.
Is 12V obtained at IC252
pin#16?
YES
IC601 pin#31 is L?
pin#21 is H?
YES
Is about 3.5V obtained
at IC252 pin#9?
Is about 8V obtained at
at IC 252 pin#10?
YES
Replace IC252.
20
NO
Check POWER circuit.
NO
Check IC601.
Check R923,R924,
NO
R925,R926