Sanyo LED-42XR10FH, Service Manual, Page: 32 / 48

3
、
No sound, but picture is normal.
Check if
voltage of N609-
4#/5#/32#/33# is
+24V?
Check +24V of power
board and its related
circuits
.
Check if
N609-12# /
25# has input
signal?
Check if
voltage of N609-
10# / 27# is high
level?
Check peripheral
circuits of power
amplifier.
Check mute circuits of
power amplifier
Check if
N320-3# / 5#
has input
signal?
Check earphone
amplified circuits
Check audio output
circuits of main chip
Yes
Yes
Yes
Yes No
No
No
No