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5.9 Checking the interface circuit of sync signal
5.9.1 Checking the control circuit of horizontal sync pluse
Check the horizontal sync signal on P302 pin13 TTL
level.
OK
NG
Failure Point
Video cable is failure.
Check the horizontal sync signal on I308 pin9 TTL
level.
OK
NG
Failure Point
1) Printed wire broke between P302 pin13 and
I308 pin9.
2) FB304 , R309 is open.
3) D307 ,R319 or C322 is short.
Failure Point
Process "Checking the resolution change IC movement"
section.
Check the vertical sync signal on P302 pin14 TTL level.
OK
NG
Failure Point
Video cable is failure.
Check the horizontal sync signal on I308 pin8 TTL
level.
OK
NG
Failure Point
1) Printed wire broke between P302 pin14 and
I308 pin8.
2) FB305 or R308is open.
3) D310,R318 or C313 is short.
Failure Point
Process "Checking the resolution change IC movement"
section.
5.9.2 Checking the control circuit of vertical sync pluse
Go to cover page
28
5. Troubleshooting (continued)
ACER X193HQ