TiBook certain keys not working

[s_pupp]

I have a PowerBook G4 500 (M5884) that is having a logic board keyboard issue.

The tab, command, left arrow, up arrow, and delete keys (and probably some others) do not work.

I have tried multiple keyboards, and all work normally with a different PowerBook G4.

I have tried heating the logic board connector leads after application of flux.  The pads and leads look great, but no difference.

Any suggestions?

Thanks in advance.

 

[s_pupp]

Solved - bad PMU or PMU cable.

I replaced the logic board, but the problem remained.

I replaced the PMU board and PMU cable, and all the keyboards now work.

In this model, the trackpad connects to the PMU board.  The PMU board connector leads from the logic board to both the PMU board and the inverter.

How this affects the keyboard, which has its own connector, is beyond my ability to reason.

Too bad for me, all the futzing around with the logic board connector of the first motherboard resulted in a broken pin on what turned out to be a perfectly good 500MHz M5884 logic board.