NEC MultiSync LCD1550ME Service Manual page 83

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Check the negative vertical sync
pulse output to P307 pin 40 from
I306 pin 73 at TTL level.
NG
OK
Check the positive DE pulse
output to P307 pin 42 from I306
pin 43 at TTL level.
NG
OK
Check the SHFCLK OUTPUT to
P307 pin 44 from I306 pin 44 at
TTL level.
NG
OK
Process "Checking the
resolution change IC movement"
section.
1) Printed wire broke between I306 pin 73 and P307 pin 40.
2) R351 open
3) C384 short
1) Printed wire broke between I306 pin 42 and P307 pin 42.
2) R352 open
3) C385 short
1) Printed wire broke between I306 pin 44 and P307 pin 39.
2) FB312 open
3) FB311 open
4) C354 short
5) C355 short
6-8
Failure point
Failure point
Failure point