Checking The Control Circuit Of Vertical Sync Pulse - NEC -FA150ATUA Service Manual

8.2 Checking the control circuit of Vertical sync pulse

Check the vertical sync signal on
I306 pin 17 and I305 pin 128 (VS_ASIC
O K
Process "Checking the resolution change IC
Trouble Shooting
at TTL level.)
Process "Checking I302 pin 4 Output at TTL level
N G
N G Process "Checking I302 pin 1 Input at TTL level
N G
O K
O K
Failure point
1) Printed wire broke between I302 pin 4 and
I306 pin 17 I305 pin 128
2) FB304 open
movement" section.
Failure point
1) Video cable may have failed.
2) Printed wire broke between P302 pin 14
and I302 pin 1.
3) FB322, R301 open
Failure point
I302 failure
NEC-FA150ATUA