24
3.4 No sound but with picture
No sound but with picture
Check if X709of 55# has output
Speaker fails to work
Check if corresponding pins of power
amplifier have output
Check periphery circuit
of power amplifier’s
back level
Check if there have signals
inputted from C801 and C803 to
power amplifier
Check periphery circuit of power
amplifier, power supply circuit and
circuit of pin MUTE
Check if corresponding
channels of N705 have
input signal
Check periphery circuit of
N705
，
crystal oscillation
and power supply
Follow the direction of audio
signal input to check each
channel
Yes
No
Yes
No
Yes
No
Yes
No
