No Sound In Tuner Mode - Panasonic SA-AKX710PU Service Manual

7.5.

No Sound in Tuner Mode

Press Power Button of Unit
or Remote Control to Turn
ON the Unit
Switch to Tuner (FM Mode)
Check if antenna is
connected properly
to Tuner jack.
Yes
Switch to AUX
mode. Check if
have sound
No
Sound
Check pin 11 of
IC52
3.3V -> OK
Ok
Check pin 1 of
CN51 on Tuner
PCB.
3.3V OK
OK
Check status of
I2C lines
SCL/SDA.
R55/56 at tuner
pcb
OK
1
Change
No
antenna wire
connection
accessory
2
Change
L51 on
Yes
Tuner PCB
3
Change
NG
IC52 on
Tuner PCB
4
Change
NG
L54 on
Tuner PCB
5
Change
IC52 on
N
tuner PCB
Check I2S
lines status.
R51/52/60
OK
Check Tun-Int
pin 3 on
CN51. OK =
<0.3V
OK
Check Tun_Rst
pin 9 on CN51.
OK=<0.3V
OK
Check above
pins form SOC
IC output
End
26
NG
Change
IC52 on
tuner PCB
6
NG
Change
IC52 on
Tuner PCB
7
Change
NG
IC52 on
Tuner PCB
NG
Change
SOC IC
PCB