NEC MultiSync LCD1700NX A Service Manual page 79

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Check the 3.3 V power are supplied on I323, I330 pin 2.
NG
Check if the voltage on I323, I330
OK
pin 3 is high (5Vdc).
Is a dot clock being output under the
condition that a LCD module is connected
to l322 pin 2?
NG
OK
Check the H-sync pulse of negative polarity
is output on RN314 pin 8 at TTL level.
NG
OK
Check the V-sync of negative polarity
are output on RN314 pin 7.
NG
OK
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NG
OK
Failure point
I323, I330 Failure
1) I315 failure
2) Printed wire broke between I315 and L322 pin 2.
1) I315 failure
2) Printed wire broke between I315 and RN314 pin 8.
1) I315 failure
2) Printed wire broke between I315 and RN314 pin 7.
6-4
Failure point
1) Printed wire broke between I322 and I323, I330.
2) I322 failure.
Failure point
Failure point
Failure point