BenQ PE8700 Service Manual page 46

RS232 is OK?
5. Power board trouble shooting guide.
P o w e r B D C h e c k .
F u s e B r o k e n ?
Y e s
P r o c e e d to " P r im a r y
C ir c u it C h e c k " .
N o + 3 .3 V O u tp u t.
C h e c k + 3 .3 V - F ix e x is ts ?
Y e s
F 7 0 4 B r o k e n ?
Y e s
R e p la c e n e w f u s e .
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Check R61,R62
Check U14
No
Check main board
D is c o n n e c t th e w ir e
N o f o r m b u tto m b d . to
p o w e r b d .
S h o r t P in 1 2 & P in 9 .
C h e c k o u tp u t
v o lta g e s .( 1 ) + 3 .3 V ( 2 )
+ 1 2 V ( 3 ) + 5 V ( 4 ) + 5 V -
F ix ( 5 ) + 3 .3 V - F ix .
P r o c e e d to " N o + 3 .3 V -
N o
F ix o u tp u t" .
N o Q 7 0 4 w o r k s n o r m a lly ?
Y e s
C h e c k tr a c e .
C h e c k Q 7 0 2 ,Q 7 0 3 ,
N o
a n d O n /O f f s ig n a l.
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