Samsung HT-BD1255 - Page 34


4
-
8
S
am
s
ung
E
l
e
c
t
ro
n
i
cs
Troubleshooting
4-1-4
NO SOUND-
2 (waveform when
1KHz, -20dB signal
is input)
CN2: +12V
Check
No
No Sound
A
CHECK POWER
Replace SMPS
Y
es
UPIC1 (PS9830B)
Pin 15, 16, 17 Check
No
Check UPIC1 Data Line
Pattern
PWM INPUT CHECK
UPIC1 (PS9830B)
Pin 48, 49, 51, 52, 54, 55, 61,
62, 67, 68 Check
PWM OUTPUT CHECK
UPIC1 (PS9830B)
POWER (3.3V) Pin 4, 10, 22,
29, 39, 47, 56, 65, 72, 84,
87, 94 Check
Replace UPIC1.
Check UPIC1 Power pin
pattern.
AIC7, 8, 9 (4
560)
Pin 1, 7 Check
OP AMP IC OUTPUT
CHECK
AIC7, 8, 9 (45
60)
POWER (+5V, -5V)
Pin 8, 4 Check
Y
es
Y
es
No
Y
es
Y
es
No
Replace AIC7, 8, 9.
N
o
N
o

Refer to wave pattern
image of Fig. 4-3.

Refer to wave pattern
image of Fig. 4-4-1
and Fig. 4-4-2.