Hello, I'm trying to troubleshoot a strange issue that arose with my A2000. I've searched around online and can't find anyone else describing something similar to this.
Recently, in order to install an Indivision ECS onto the board, I replaced a nearby capacitor with one that is smaller in dimensions, so that the Indivision ECS can fit. Since then, whenever I power on the A2000, the fan spins for about 1 second before shutting off completely. (I'm using an original A2000 PSU, not an ATX replacement.)
If I remove the 68000 from its socket, this behavior doesn't occur - the PSU fan spins and continues to supply power to the board until it's switched off again. Strangely, if I keep the 68000 inserted and instead remove Gary, the PSU fan remains spinning for about 4 seconds before shutting off. I also tried using a different 68000 from another Amiga of mine, and the issue persists.
Given the behavior described above and the fact that this only began happening after working on the motherboard, I don't think the PSU is the issue here. The behavior also shouldn't be related to the capacitor I replaced, because it continues to occur even switching between the old and the new capacitor. It could be that handling the board while replacing the capacitor caused something else to break.
Does anyone have suggestions on what else I can test to determine the cause of this? My skills are fairly basic, so if you recommend any tests with a multimeter then I may need some guidance. Thanks in advance for your help, and I very much hope I can get this machine back up and running.
Edit: Forgot to mention that there is some corrosion damage around where the battery used to be - this never stopped the Amiga from fully working before, but I suppose it could have caused something unpredictable to happen while handling the board, if some of the traces were weakened by it.
Edit 2: Like with the 68000, removing the Kickstart ROM and then powering on also sustains power (video outputs a black screen). Replacing the Kickstart ROM once again causes the PSU to power off after 1 second. Tried with two different ROMs. Also, removing the right CIA chip boots the Amiga to a yellow screen for ~5 seconds before the video signal disappears. Replacing it (tried two different chips) once again causes the PSU to power off after 1 second.