Acer AL1516W Service Manual page 28

5.7 Checking the interface circuit of sync signal
5.7.1 Checking the control circuit of horizontal sync pulse
Failure Point
Process "Checking the resolution change IC
movement" section.
5.7.2 Checking the control circuit of vertical sync pulse
C h e c k t h e h o r iz o n t a l s y n c
s ig n a l o n P 3 0 2 p in 1 4 T T L
C h e c k t h e h o r iz o n t a l s y n c
s ig n a l o n I 3 0 5 p in 2 8 T T L
F a ilu r e P o in t
P r o c e s s " C h e c k in g t h e r e s o lu t io n c h a n g e I C
m o v e m e n t " s e c t io n .
5. Troubleshooting (continued)
Check the horizontal sync
signal on P302 pin13 TTL
level.
NG
OK
Check the horizontal sync
signal on I305 pin27 TTL
level.
NG
OK
le v e l.
N G
O K
le v e l.
N G
O K
Failure Point
Video cable is failure.
Failure Point
1) Printed wire broke between P302 pin13
and I305 pin27.
2) FB309, R321 are open.
3) D307 or R324 or C327 is short.
F a ilu r e P o in t
V id e o c a b le is f a ilu r e .
F a ilu r e P o in t
1 ) P r in t e d w ir e b r o k e b e t w e e n P 3 0 2 p in 1 4
a n d I 3 0 5 p in 2 8 .
2 ) F B 3 1 0 o r R 3 2 2 is o p e n .
3 ) D 3 0 6 o r R 3 2 3 o r C 3 2 6 is s h o r t .
ACER AL1516W 27
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