Prima PH50D8, Руководство по обслуживанию

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3
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There is picture but not sound.
If there is output from XA04of sound power amplification board
No
Yes
yes no
yes no
4
．
A certain channel is abnormal
1) AV no picture
First, use dual picture function to judge if the main or sub picture has problem.
No picture in main channel:
yes no
no yes
no
yes
There is picture but no sound
Sound box damaged
Sound power ampl. or other peripheral circuit have
problem. Check power supply,if SHUTDOWN pin
control is normal and if output short circuited or other
problems that cause protection to work.
Measure if there is signal in pin 2 of
sound power amplf.2
Measure if the sound input of the
present channel corresponding to NM2
is normal
MSP3440 or other peripheral
circuit have problenm
Check different levels of circuit
following input audio signal
channel
Check if pin 72 of N102 has signal input
Measure Y and C signal output from
R143~R148and line/field signal are normal
There is problem from Av
socket to N102channel
Check R209~R213 to see if
PW1230 output is normal
N102 or other peripheral
circuit have probblem
N204 PW1230 or other peripheral
circuit have problem
N501 PW181 or other peripheral
circuit have problem