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3.With picture but no sound:
4. A certain channel is abnormal
4.1 No picture on AV
The sound power amplifier or peripheral
circuit has problem. Check power supply,
if the control of ENABLE pin is normal; if
output short-circuited or other problems
that causes protection to work.
Check if the video processing board X110 is output.
The sound damaged.
Check if the second pin of sound
power amplifier input the signal.
Measure if the sound
input of current channel
of N101 is normal.
Check MSP3440 or
peripheral circuits.
Check different levels of
circuit following input audio
signal channel.
No Yes
No
Yes
No
Yes
Check if the C228 has
the signal input.
Check if the pin 2 of
N708 has input signal.
Check periphery circuit of N201,
crystal and power supply
Check the periphery circuit
of N708 and power supply
Check the AV terminal
socket to N708 channel
Yes
No
Yes
No
