This is an old post, preserved for reference.
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This is the second part of the Acorn Electron repair. Last time I got the main board working after it arrived in this state. Looking at this photo, you can see the colour difference between the two halves. I would guess that someone had two Electrons, one with a broken keyboard, and one with a faulty main board, and guess which two halves I have here?
USB keyboard controllers as I know that it is protected against shorts on the pins. On the Electron, fourteen of the pins are connected directly to the address lines, so any shorts could damage the board. (there are diodes to protect the address lines from shorting in operation, but they are on the keyboard PCB, so any shorts in the cable could cause problems).
2022 Update: Did you spot the prototype SD2Elk in one of the photos? I don't think anyone did at the time. The idea was basically add a userport to the Electron and use a BBC Userport SD solution. The worked with a few tweaks to the code, but so much software wouldn't work as it was all originally tape based and didn't work when the disk interface used extra RAM and moved page up. I was looking at various solution to that, but finally ditched the project when I saw that someone else had released something along similar lines. I was unsurprised to see a review from Chinnyvision which basically concluded that none of the games he wanted to play worked for exactly the reasons given above.