NEC MultiSync LCD1700NX A Service Manual page 83

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Check the negative vertical sync
pulse output to RN314 pin 7
from I315 pin F19 at TTL level.
NG
OK
Check the positive DE pulse
output to RN314 pin 6 from
I315 pin F18 at TTL level.
NG
OK
Check the SHFCLK OUTPUT to
L322 pin 2 from I315 pin G20 at
TTL level.
NG
OK
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1) Printed wire broke between I315 pin 73 and RN314 pin 7.
2) I315 failure.
1) Printed wire broke between I315 pin F18 and RN314 pin 6.
2) I315 failure.
1) Printed wire broke between I315 pin G20 and L322 pin 2.
2) L321 open
3) C583 short
4) C590 short
5) L322 short
6) I315 failure
6-8
Failure point
Failure point
Failure point