NEC MultiSync LCD1550V Service Manual page 59

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Check the LOAD, POL, REV, CPV, OE of positive
polarity are ouput on CN2 pin 30, 31, 32, 37, 38.
NG
OK
Check the data signal output on CN3 and CN2 R, G,
B data pin.
NG
OK
The cable broke between CN2, CN3 and LCD module.
Failure point
1) U3 failure.
2) Printed wire broke between U3 and
CN3 pin 30, 31, 32, 37, 38.
3)R69, 70, 71, 74, 75, L15,16, 17, 20
or L21 failure
6-5
Failure point
Failure point
1) U3 failure.
2) Printed wire broke between
U3, CN2 and CN3 data line.