Sanyo LED-22XR10F Service Manual page 37

3、 No sound, but picture is normal.
No
Check mute circuits of
power amplified
Check if
voltage of N407-
19# / 25# is high
level?
Yes
Check if
N313-3# / 5#
has input
signal?
Yes
Check audio output
circuits of main chip
voltage of N406-
2#/3#/34#/35#/
40#/41#/44#/45#
Yes
Check if
N407-15#
/20- 22# has
input signal?
Yes No
Check peripheral
circuits of power
No
Check mute circuits of
power amplifier
Check if
is +12V?
No
Check +12V of power
board and its related
circuits.
amplifier.