Was testing a 2e yesterday. It booted but after a few seconds went down with the psu making worrying noises.
At first thought it was the PSU, so switched a working one on it, but only made same noises.
Then measured the V's of that one and compared them to the first one and all looks good.
So the 2e board itself...
Measured resistance over the power lines; - V's are good. +5 was just some 10 Ohm, but went high when i unplugged keyboard. Seems to be the light in there that makes the resistance low, bc it seems to be a an actual tiny lightbulb.
The 12 V however has a resistance of ~1 Ohm, which is effectively a short.
Took the board out, but i cant see anything wrong. The schematic isnt all that clear to me, what all uses 12 V. I know the expansion cars all but 0 and 1 i think have 12V and i saw the power on led is on 12-5V.
Anyone any tips before i spend another day(s) searching?