Page 10
Trouble Shooting
B17AAU / B17ANU / B17AAY
7. Checking the interface circuit of sync signal
7.1 Checking the control circuit of horizontal sync pulse
Check the horizontal sync signal on I315
pin L2 TTL level.
O K
N G
Failure point
1) Video cable may have failed.
2) Printed wire broke between P304 pin 13
and I315 pin L2
3) FB305, R329 open
4) R330, C352 short
Process "Checking the resolution change IC
movement" section.
Check the vertical sync signal on I315 pin
K1 TTL level.
O K
N G
Failure point
1) Video cable may have failed.
2) Printed wire broke between P304 pin 14 and I315
pin K1
3) FB328, FB304 open
4) R331, C353 short
Process "Checking the resolution change IC
movement" section.
7.2 Checking the control circuit of vertical sync pulse
Summary of Contents for B17AAU
Page 1: ...17 inch LCD Monitor B17AAU B17ANU B17AAY Service Manual...
Page 30: ......
