No Osm Display; Osd Adjust Problem - NEC NMV 1700V Service Manual

5. Abnormal OSM display

5.1 NO OSM display

Check the input of 3.3Vp-p pulse from I315 pin P3, P4, R1, R2, P2, P1.
NG
OK
Proceed "Checking the resolution change IC movement" section.

5.2 OSD Adjust problem

Check the input TTL level whether was changed when pressed function keys.
NG
OK
Page 8
Failure point
1) Printed wire broke between I315 pin P3 and I302 pin 5.
2) Printed wire broke between I315 pin P4 and I302 pin 4.
3) Printed wire broke between I315 pin R1 and I302 pin 3.
4) Printed wire broke between I315 pin R2 and I302 pin 2.
5) Printed wire broke between I315 pin P2 and I302 pin 7.
6) Printed wire broke between I315 pin P1 and I302 pin 6.
7) RN301, RN303 open/short.
Failure point
1) Printed wire broke between P302 pin 3 and I302 pin 15.
2) Printed wire broke between P302 pin 4 and I315 pin G19.
3) Printed wire broke between P302 pin 5 and I315 pin G18.
4) Printed wire broke between P302 pin 6 and I315 pin L1.
5) Printed wire broke between P302 pin 7 and I315 pin M1.
6) C322, C323, C324, C326, C327 short.
7) RN306, RN307, short/open.
8) I315 failure.
Proceed "Checking the resolution change IC movement" section.
NMV 1700V
Trouble Shooting