Daewoo DV6T811N-LT, Service Manual

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15
TROUBLESHOOTING
4. AUDIO
No sound in RF E-E
mode
Is there Audio at IC252
pin#5,14?
IC601 pin#27
A.Mute is L or
H?
A. No sound in E-E mode
A. a.1 RF E-E
NO
Check signal flow circuit
from IC251 to IC252.
Is 12V obtained at IC252
pin#16?
Is RF Audio signal output at
IC252 pin#3,13?
Check POWER circuit.
NO
YES
NO
IC601 pin#20 is H,
pin#21is L?
Is about 3.5V obtained at
IC252 pin#9?
Is about 8V obtained at
pin #10?
YES
Check IC601.
Check
R298,R299,R646,R647.
NO
NO
C at Q258 is L or H?
YES
Check IC601.
Check Output JACK.
H
H
L
YES
Is Audio signal output at IC251
pin#19, 20?
Are CLK and DATA obtained
at IC251 pin#42,43?
NO
Is 5V obtained at IC251
pin#40?
Is there Audio at IC251 pin#2,
3 in RF mode?
Check IC101 and RF101
Block(Ad2).
NO
Replace IC251.
NO
YES
YES
Is 12V obtained at IC251
pin#34?
NO
YES
Check POWER circuit.
YES
Check
Q257,Q258,R24
0, R241, R242
L
Replace IC252
YES