HP 67 Repair Person HELP WANTED

[John Garza (3665)]

Well... based on the pics, 3.13V is too low, and 5.11V is too high.
Try 3.8

...and if that's not the issue, clean for corrosion even if you don't see it. Even a slight layer can cause trouble. If it's still not responsive, I'd swap out the logic board with a known good one to narrow down the location (logic board vs. keyboard traces, faulty switches, loose wires, etc.)

-J