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8. Checking the interface circuit of sync signal
8.1 Checking the control circuit of horizontal sync pulse
I306 pin 19 and I305 pin 127 (HS_ASIC at
Process "Checking the resolution change IC
Check the horizontal sync signal on
TTL level.)
Process "Checking I302 pin 8 Output at TTL level
N G
N G
Process "Checking I302 pin 13 Input at TTL level
O K
O K
Failure point
1) Printed wire broke between I302 pin 8 and
I306 pin 19 I305 pin 127
2) FB305 open
movement" section.
Failure point
N G
1) Video cable may have failed.
O K
2) Printed wire broke between P302 pin 13
and I302 pin 13.
3) FB323, R302 open
Failure point
I302 failure
NEC-FA150ATUA
Trouble Shooting
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