Pioneer organ transplant killed donor. Have I learned anything?

[GreyUser]

The keyboards are (electrically) identical for all pioneers so you did no damage with the cpu swap but as already mentioned, the lcd’s are incompatible between those models.

Some possible things come to mind that would prevent a 32sii from powering up, in order from least likely to most likely:

1) open pc board traces, in the battery supply, open from corrosion.

2) broken processor pins at the solder interface. Caused by crushing the unit, placing force on the raised ic package protruding from the top of the circuit board.

3) open on/off traces in keyboard due to getting wet and leaving the batteries in place. Electrolysis will cause the carbon based traces to rise to 100k and up which prevents turn-on. Refer to the schematic and measure resistance with On key press per document below.

4) shorted key in the matrix due to failed hinge or end of life flex dome. Measure all columns to rows per schematic.

https://www.hpmuseum.org/cgi-sys/cgiwrap...i?read=451

PS: always discharge any residual charge on the tantalum capacitor before reinstalling batteries. A sure sign of a shorted key is easy to diagnose with the following:

With unit assembled, discharge cap and install fresh batteries. Turn unit on. Observe display. If a key is shorted, it will appear onscreen, i.e. ‘Enter’.

If you see a key name upon first turn on, it’s shorted. It will not accept any keystrokes and once it turns off, it will not turn back on until you remove batteries, short the capacitor and reinstall batteries. Repeat above behavior.