Abnormal Screen - NEC MultiSync LCD1550ME Service Manual

Table of Contents

4. Abnormal screen

Check the R, G, B video signal from

computer input on D-Sub R, G, B

connector.

Check the R, G, B input signals on

I306 pin 95, 91, 87 respectively that

their level is 0.7Vp-p maximum.

Is the pulse of the TTL level being

output to P306, P307 from the

data line of I306?

Check the negative horizontal

sync pulse output to P307 pin 38

from I306 pin 74 at TTL level.

1) Printed wire broke between I306 data line and P306, P307.

2) I317 failure.

1) Printed wire broke between I306 pin 74 and P307 pin 35.

2) R350 open

3) C383 short

1) No R, G and B video signal output from host computer.

Check computer

2) Video signal cable disconnection.

In the case of the Red signal. (A Green and Blue signal is

the same path, too.)

1) Printed wire broke between D-Sub(R) and I306 pin 95.

2) R346 short.

3) C348 open.

4) R345 open.

Failure point

6-7

Failure point

Table of Contents

Table of Contents

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