Samsung i780 Service Manual page 60

9-3. SPEAKER Working
OPERATE
SPEAKER
SPK-ASSy' Break
down?
3,4 Pin in U400
Signal On?
NO
6, 10 Pin in U402
Signal On?
NO
35,36 pins for voice
call &
35, 36, 5 pins for
MP3 in UCD 400
Singal On?
NO
Check UCP 200 for
voice call ,
UCP 700 for Mp3
&Neighboring circuits
NO
YES
NO
YES
YES
YES
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Change SPK -
Ass'y
Check U400 &
Neighboring
circuits
Check U402 &
Neighboring
circuits
5, 6 pins in
U515
Signal On?
NO
Check U512 &
Neighboring
circuits
9-13
Flow Chart of Troubleshooting
YES
Check UCD 400&
Neighboring
circuits