Unstable Power - Acer AL1917x Service Manual

Acer

2. Unstable Power

U n sta b le p o w e r
C h e ck
sa m p lin g
C ircu it
Y E S
C h e ck th e R p in
vo lta g e o f IC 8 0 3
a b o u t 2 .5 V
Y E S
C h e ck p in 1 o f
IC 8 0 2 vo lta g e is
5 .8 V
Y E S
C h e ck p in 3 o f
IC 8 0 2 vo lta g e
a b o u t 1 V
Y E S
E N D
N O
C h e ck R 8 1 0 ,
R 8 1 1 ,R 8 1 8
N O
C h e ck th e C p in
vo lta g e o f IC 8 0 3
if 3 V
Y E S
C h e ck
R 8 0 9 , R 8 0 8 ,
R 8 1 4 , D 8 0 9
N O
C h e ck D 8 0 6 ,
C 8 1 5 if sh o rt
C h a n g e
D 8 0 6 ,
C 8 1 5
N O
C h a n g e R 8 0 1 ,
R 8 0 5 , R 8 2 2 ,
R 8 2 3 , R 8 1 7
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Service Manual
N O
C h a n g e R 8 1 0 ,
R 8 1 1 , R 8 1 8
N O
C h a n g e IC 8 0 3