HP25C repair, help needed

[AndyWalter]

I don't know if the 25 & 25C psu is the same as that in the 29C, but you can get the full 29C Service manual with schematics & scope waveforms etc here:
https://www.dropbox.com/s/7yh1e0dqtgg2k1...l.pdf?dl=0

Whereabouts are you located? I'm in UK. I have just restored a 25, which was totally dead, nothing on the display when battery connected; I stripped every component except keyboard & the display panel, and used Panamatik's brilliant PIC-chip replacement; this has it's own ram, display drivers, uses less power than the originals, faster, can emulate quite a few of the handhelds, has a beeper + timer, can have GPS, ... ! It just might be worth ditching your components & using one of these!

I have all the old components I took out - no idea if any of them work or not, but if it helps I can post them to you! I also have some photos of the board before I removed the chips, will try to post those here in a few minutes...
Andy