Kept in a loft for many years, the battery leaked and damaged the motherboard:
With any other computer I would have just tried to find a replacement, but I had to try and fix this one as it was the one I actually used back in the day. So, I cleaned up the area and had to find where the damaged traces linked to so I could re-wire them, which included desoldering some parts so I could see the board.
The initial clean-up, removal of the old battery and a few components to clean up the surrounding area:
I later removed a few more things. Partly just to do more cleaning and also because I had to try changing a few parts, like the U31 chip. It also helped to follow the traces.
I also de-soldered the big keyboard chip on the left there and fitted it in a new socket.
The rest was using the multimeter to find where those traces started and ended. You can see in the first picture how messed up they are.
Set it up with the original monitor:
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