Daewoo L520B Service Manual page 40

7. Sound Problem
No Sound
Is
Audio-in OK?
(pin 10, 14 at PC Source
and pin 9, 13 at AV
Source
Is VDD(pin2)
of Audio IC(IC 601)
9V?
Is Audio-out
OK?
Check speaker.
No
Yes
No
Yes
No
Yes
Check Audio-in
jack(CN 11).
Is input of
9V regulator(IC 602)
12V?
Yes
Check power board
Are SCL(pin 28),
SDA (pin 27)
OK?
Yes
Change Audio IC(IC601).
38
No
Change 9V Regulator
(IC 602).
No
Check CA 602.