Sanyo LCD-39XZ12F Service Manual page 24

No sound, but picture is normal:
3．
No sound
Check if level of
N606-PIN19&25
are all high?
No
Check if level of
V609-b is low?
Yes
Replace
V609
Check Reset &
Mute circuits of
power amplifier.
Check
Yes
signal
N606-PIN15&20&21
&22 ?
Check power voltage
of N606.
No
Check IIC signal of
N606- PIN23&24.
if there is
No
inputted to
Yes
No
Yes
Check IIS
(signal input
circuits) on main
board.
Check +12V on
power board.