Panasonic SA-MAX3500PU Service Manual page 20

7.2. No Sound Coming out from All Speakers
Press Power Button of Unit
or Remote Control to Turn
ON the Unit
No Audio in both high and
low channel at All Selector
Check SOC(IC1001)
output signal
- I2C(
pin 72, 73
- I2S(
pin 81~84
Check Check
DSP (IC4001)
I2S input
Check Supply
voltage of
DSP
(pin 11, 21, 36, 40)
Check DSP
crystal 24MHs
frequency
(X4001)
Check DSP
PWM Out
(pin 27 to 34)
1
No
Change SOC
(IC1001)
)
)
Yes
2
No
Change series
resistors Between
SOC and DSP if
Found NG
Yes
3
No
Change LB4001
LB4002 LB4003 if
found NG
Yes
4
No
Change 24MHz
Crystal Oscillator
Yes
5
No
Change
DSP IC
Yes
Check DAMP
IC PWM input
Yes
End
20
6
No
- Change series
resistors
Between DSP
and DAMP if
Found NG