Daewoo DV6T812N Service Manual page 17

TROUBLESHOOTING
4. AUDIO
A. No sound in E-E mode
A. a.1 RF E-E
No sound in RF E-E
mode
Is 12V obtained at IC251
pin#34?
YES
Is 5V obtained at IC251
pin#40?
YES
Is there Audio at IC251 pin#2,
3 in RF mode?
YES
Is Audio signal output at IC251
pin#19, 20?
YES
Is there Audio at IC252
pin#5,14?
YES
Is RF Audio signal output at
IC252 pin#3,13?
YES
C at Q258 is L or H?
L
Check Output JACK.
NO
NO
Are CLK and DATA obtained
at IC251 pin#42,43?
NO
NO
IC601 pin#27 H
H
Check IC601.
A.Mute is L or
H?
L
Check
Q257,Q258,R24
0, R241, R242
NO
Check IC101 and RF101
NO
Check signal flow circuit
from IC251 to IC252.
Is 12V obtained at IC252
pin#16?
YES
IC601 pin#20 is H,
pin#21is L?
YES
Is about 3.5V obtained at
IC252 pin#9?
Is about 8V obtained at
pin #10?
YES
Replace IC252
16
Check POWER circuit.
Block(Ad2).
Replace IC251.
NO
Check POWER circuit.
NO
Check IC601.
NO Check
R298,R299,R646,R647.