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No sound
R105
and
C104
have
mangling
IC101andC108 out of
performance
change the wrong
components
to
deal
No sound
take earphone to
test the sound
no
10V voltage
Feet6 of IC101
yes
to test IC101 Feet5 by
oscillograph to assure
no
yes
to test IC101 Feet3 by oscillograph
to assure video signal output
no
to
test
IC101
oscillograph to assure video signal
no
yes
test the performance of outer components IC301
Feet2,52,53,54
IC301 is damaged
The jack of earphone
and speaker are broken
yes
no
on
yes
Feet1
by
C105 and C106 out of
performance
R101 R102 C102
C103
may
be
damaged
4
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