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check all the power supplier ,CPU,
decoding
clock
electrocircuit,
replacement electrocircuit
Both of Video process and the decoding electrocircuit
work well , should pay more attention to the high and
intermediate frequency electrocircuit of picture
spur tracks of
power supply
Circuit
of
no
Contrary
rise
voltage
mine
no
and
repair
the
change the wrong
components to deal
No picture
no
yes
Whether there is 5V
no
voltage
on Feet 2
of tuner
yes
Whether the VT voltage of
Feet6 of tuner is + 33
normal
Whether the voltage is changed
in
the
relative
feet, when
switching the waveband of TV
tuner whether the intermediate
frequency amplification works
well
normal
no
check
related
electrocircui
C312,C313,C344
No picture
whether display a blue
screem and normal menu
yes
check AV picture
good or not
It means that the we should check more in video process
and the decoding electrocircuit to the sub-circuit ofIC301,
also the synchronized signal circuilt
to
measure
synchronized
signal
oscillograph to sure the tricolor
display of Feet13,14,15 normal or
not
No SYNC
check IC402 and the related
outer electrocirc
normal
Check the 27
feet with oscillograph,
whether there is field
signal .
on
check IC301
and
the
related outer
no
compounding
norm
by
al
check IC301RGB output
electrocircuit
th
and23th
RGB
signal
outputs
related electrocircuit
change or repair the
panel , the drive of
the panel may be
abnormal
No RGB
3
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