No Osm Display - NEC MultiSync LCD1525V Service Manual

5. No OSM display

Check the output of 5Vp-p pulse from I402 pin 12, 13, 15, 17 when press PROCEED key.
NG
OK
OK
OK
a
Check the input of 5Vp-p pulse from I402 pin 4, 5, 6.
NG
Check the output of 5Vp-p pulse from I208 pin 4, 5, 6.
OK
1) Printed wire broke between I402 pin 5 and I208 pin 2.
2) Printed wire broke between I402 pin 6 and I208 pin 5.
3) Printed wire broke between I402 pin 4 and I208 pin 6.
Check the input of 5Vp-p pulse from I401 pin B7, A8, B8 are same as I402 pin 13, 15,
17, or check input of 5Vp-p pulse from I401 pin C7 is same as I402 pin 12.
NG
1) Printed wire broke between I402 pin 12 and I401 pin C7.
2) Printed wire broke between I402 pin 13 and I401 pin B7.
3) Printed wire broke between I402 pin 15 and I401 pin A8.
4) Printed wire broke between I402 pin 17 and I401 pin B8.
b
NG
Proceed "Checking the operation of CPU" section.
Failure point
Failure point
6-9