XOCECO PS42K8, Руководство по обслуживанию

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18
3
．
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/YCRCB no picture
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
If Check U29 pin72
(S-VIDEO),pin73(VIDEO) and
pin5,75 (YCRCB)signal input
Check U29
pin27,31~34,37~40
output and ITU-R 656
Check U29
Check RP3~RP9 and U13
FLI2310 output
Check U29
Check U13 FLI2310 Check U12