Samsung HT-BD1255 Service Manual page 34

Troubleshooting
4-1-4 NO SOUND-2 (waveform when 1KHz, -20dB signal is input)
No Sound
CN2: +12V
UPIC1 (PS9830B)
Pin 15, 16, 17 Check
UPIC1 (PS9830B)
Pin 48, 49, 51, 52, 54, 55, 61,
62, 67, 68 Check
AIC7, 8, 9 (4560)
Pin 1, 7 Check
4-8
CHECK POWER
No
Check
Yes
PWM INPUT CHECK
No
Yes
PWM OUTPUT CHECK
No
 Refer to wave pattern
image of Fig. 4-3.
Yes
OP AMP IC OUTPUT
CHECK
No
 Refer to wave pattern
Yes
image of Fig. 4-4-1
and Fig. 4-4-2.
A
Replace SMPS
Check UPIC1 Data Line
Pattern
UPIC1 (PS9830B)
POWER (3.3V) Pin 4, 10, 22,
29, 39, 47, 56, 65, 72, 84,
87, 94 Check
AIC7, 8, 9 (4560)
POWER (+5V, -5V)
Pin 8, 4 Check
Check UPIC1 Power pin
pattern.
Yes
No
Replace UPIC1.
No
Replace AIC7, 8, 9.
Samsung Electronics