Daewoo DV6T811N-LT, Service Manual

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16
TROUBLESHOOTING
Is there Audio IC252 pin#5, 14?
IC601 pin#27
A.Mute is L or
H?
A. b. LINE1 E-E
YES
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.
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
Replace IC252.
Check IC601.
Check R298, R299, R646,
R647.
NO
NO
NO
C at Q258 is L or H?
YES
Check
IC601.
Check Output JACK.
Check
Q257,Q258,R2
40,R241,R242.
H
H
L
L
YES
YES
No sound in LINE1 E-E
mode.
Is 12V obtained at IC251
pin#34?
NO
Is 5V obtained at IC251
pin#40?
Check POWER circuit.
YES
NO
Are CLK and DATA obtained at
IC251 pin#42,43?
Check Input LINE1
JACK
Replace IC251
NO
Is Audio signal output at IC251
pin#19, 20?
Is Audio signal at IC251
pin#6, 7 in LINE1 mode?