Samsung MM-G25, Service Manual

Page: 65 / 74

Samsung Electronics 4-5
Troubleshooting
4-1-2 No Output
Check MAIN PCB
FIC1 R2S15904 input and
output signal
Check all function
(CD/DVD, Tuner, AUX).
1
/
2
Check MAIN PCB
AIC1 Pin 23: Low Mute; High Normal
FIC1 Pin 24: 9V
Check AUX signal input and signal
pattern
Check MICOM IC "UIC1"
Pin 44: Low Normal, High Mute
Yes
No
Yes
No
Yes
No
No Output
Check MPEG PCB
Replace AAIC1
Check MAIN PCB
PT01 Pin 9: -24V and
Pin 10: +24V
Check SMPS stage
(All power source check)
Yes
No
Only CD/DVD/USB
All function fail
Input signal fail
Input fine but output fail

Refer to wave pattern
image of Fig. 4-3-1
and Fig. 4-3-2.