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3、
No sound, but picture is normal.
Check earphone
amplified circuits
Check if
voltage of N407-
6# & 7# is high
Yes
Check if
N313-3# &
5# has input
signal?
Yes
No
Check audio output
circuits of main chip
Yes
Check if
N407-4# &
12# has input
signal?
Yes
level?
No
Check mute circuits of
power amplifier
Check if
voltage of
N407-3# &
13# is +12V?
No
Check +12V of power
board and its related
circuits.
No
Check peripheral
circuits of power
amplifier.
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