Daewoo DV6T712D Service Manual page 19

TROUBLESHOOTING
A. c. AV2 E-E
No sound in AV2 E-E
mode.
Is 12V obtained at IC251
pin#34?
YES
Is 5V obtained at IC251
pin#40?
Is there Audio at IC251
pin#8,9 in AV2 mode?
Is AV2 Audio signal output at
IC251 pin#16, 17?
Is there Audio at IC252
pin#1,12?
YES
Is AV2 Audio signal output at
IC252 pin#3,13?
YES
C at Q904 is L or H?
L
Check Output JACK.
NO
NO
NO
NO
H
IC601 pin#27
Check
H
A.Mute is L or
IC601.
H?
L
Check Q904,
Q905,R937,R938,
R939
Are CLK and DATA obtained at IC251
pin#42, 43?
Is 12V obtained at IC252
pin#16?
YES
IC601 pin#31 is L?
pin# 21 is L?
YES
Is about 3.5V obtained at
IC252 pin#9?
Is about 3.5V obtained at IC252
pin#10 ?
YES
Replace IC252.
18
Check POWER circuit.
Check Input JACK.
(Scart AV2)
NO
Replace IC251.
Check signal flow circuit from
IC251 to IC252.
NO
Check POWER circuit.
NO
Check IC601.
NO
Check R646, R647, R911,
R913