[HP48GX] Testing repaired keyboard

[mfleming]

Yes indeed, ground is supplied through those twist posts to the main board. Be sure to twist them back enough to reestablish electrical contact (one of my newbie mistakes when doing my first repair job).

It sounds as though TomC's observation about the ON key wiring should guide your testing. There could also be a mechanical root cause for your problem in the form of dirty key contacts. There are more posts addressing that problem if you eliminate an electrical fault as the root cause.