Sanyo PDP-42XS1 - No Picture on AV; A Certain Channel Is Abnormal; With Picture but no Sound

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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; i
f
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 soun
d
p
ower am
p
lifier in
p
ut the si
g
nal.
Measure if the soun
d
input of current channel
of N101 is normal.
Check MSP3440 o
r
peripheral circuits.
Check different levels o
f
circuit following input audio
signal channel.
N
o Yes
N
oYes
N
oYes
Check if the C228 has
the signal input.
Check if the pin 2 o
f
N
708 has in
p
ut si
g
nal.
Check periphery circuit of N201,
crystal and power supply
Check the periphery circuit
of N708 and
p
ower su
pp
l
y
Check the AV terminal
socket to N708 channel
Yes
N
o
Yes
N
o