No Osm Display - HP f1723 Service Manual

f1723 / FP7317 / L1702 / vf17 / FP17

5. No OSM display

Check the input TTL level whether was changed when pressed function keys.
Failure point
1) Printed wire broke between P308 pin 5 and I304 pin 29.
2) Printed wire broke between P308 pin 6 and I304 pin 32.
3) Printed wire broke between P308 pin 7 and I304 pin 22.
NG
4) Printed wire broke between P308 pin 8 and I304 pin 26.
OK
5) Printed wire broke between P308 pin 4 and I304 pin 16.
6) FB325, FB326, FB327, FB328. FB329 open
7) RN302, RN301, short/open.
8) I304 failure.
Proceed "Checking the resolution change IC movement" section.
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