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