5.9Checking the interface circuit of sync signal5.9.1Checking the control circuit of horizontal sync pluse
Checkthe horizontal sync signal on P302 pin13 TTL
level.
OK
NG FailurePoint
Videocable is failure.
Checkthe horizontal sync signal on I308 pin9 TTL
level.
OK
NG FailurePoint
1)Printed wire broke between P302 pin13 and
I308pin9.
2)FB304 , R309 is open.
3)D307 ,R319 or C322 is short.
FailurePoint
Process"Checking the resolution change IC movement"
section.
Checkthe vertical sync signal on P302 pin14 TTL level.
OK
NG FailurePoint
Videocable is failure.
Checkthe horizontal sync signal on I308 pin8 TTL
level.
OK
NG FailurePoint
1)Printed wire broke between P302 pin14 and
I308pin8.
2)FB305 or R308is open.
3)D310,R318 or C313 isshort.
FailurePoint
Process"Checking the resolution change IC movement"
section.
5.9.2Checking the control circuit of vertical sync pluse
Go to cover page
28 5.Troubleshooting (continued)
ACERX193HQ