Acer wistron rb23wabas Manual De Usuario
Check the horizontal sync signal on P303 pin13 TTL
level.
OK
NG
Failure Point
Video cable is failure.
Check the horizontal sync signal on I312 pin36 TTL
level.
OK
NG
Failure Point
1) Printed wire broke between P303 pin13 and
I312 pin36.
2) FB308 , R349 is open.
3) D320 ,R353 or C331 is short.
3) D320 ,R353 or C331 is short.
Failure Point
Proceed "Checking the resolution change IC movement"
section.
section.
Check the vertical sync signal on P303 pin14 TTL level.
OK
NG
Failure Point
Video cable is failure.
Check the horizontal sync signal on I312 pin37 TTL
level.
OK
NG
Failure Point
1) Printed wire broke between P303 pin14 and
I312 pin37.
2) FB309 or R351 is open.
3) D319,R352 or C330 is short.
3) D319,R352 or C330 is short.
Failure Point
Proceed "Checking the resolution change IC movement"
section.
section.
5.9.2 Checking the control circuit of vertical sync pulse
5.9 Checking the interface circuit of sync signal
5.9.1 Checking the control circuit of horizontal sync pulse
48
5. Troubleshooting (continued)
ACER V233H