So I disconnected the inside power cable (the little cable that connects to a white connector on the A500+ mainboard)
Errr. The only power connector I can think of that would be white and on the mobo is the one for the floppy drive (CN12). Connecting this backwards would result in:
* Supplying 12V to the floppy's 5V bus (and 5V to the 12V bus, but that's not a problem here). This means everything you smell is most likely from the bottom of the drive. If this is the case, then replacing the floppy should do it. Now, if you actually moved the connector "down" a pin, then you've got a short to ground, and the PSU blew a fuse or allowed a mobo trace to burn out. Maybe both.
* A possibility of that 12V feeding back on the data cable to Gary and one of the 8520 CIA chips. If this is the case, then replacing Gary, the 8520, and the floppy drive should fix things.
* An even less likely possibility that one of those chips fed the 12V to the rest of the chips on the 5V bus (I've never had any Amiga chips fail in this manner, and I'm not about to test this out). If this is the case, then the mobo and PSU are probably gone.
* The PSU did it's job, and failed before any damage was done to the rest of the system. You can open up the brick, check the fuses, and look for anything smoked. CAUTION: High Voltages Present inside!
My advice on how to go about this:
1) Check PSU for proper voltages (the lighter switching PSUs should have some kind of load on them when testing, the heavier linear models are fine without any). CAUTION: High Voltages Present inside!
2) Remove the floppy and test the system without it in there. If you get the WorkBench prompt, then it's the floppy you need to replace (and see about getting a keyed power plug, too).
3) If a new floppy isn't working, then try the 8520 first, and Gary second (CIAs are known to fail just by frowning at them). If replacing both of them doesn't work, then the whole thing is shot, or you need to find someone more knowledgeable.
banzai
