Dead 2000

[curtis]

Well, I tried to utilize a machined pin socket and plug that into the cpu socket, with the cpu, and it didn't change a thing.  Really starting to get exasperated with this thing!

[vamigan]

Have you tried this:
https://www.youtube.com/watch?v=E3YEKqEqleg

[orange]

Have you tried this:
https://www.youtube.com/watch?v=E3YEKqEqleg

I had the same problem: http://www.amiga.org/gallery/index.php?n=2390

[curtis]

Sadly, my soldering skills have deteriorated to the point I really can't do that fine of work anymore.

Looking at everything, there doesn't appear to be any green from the battery which has been removed.

None of the joints look bad.  Of course, that's looking at it with only a Mark I eyeball.

[JuMa]

I am also leaning towards trying to remove every chip and clean with a toothbrush and 99% IPA. If you have a good disk washer after the chips are removed you can use it to run the board through a cycle as long as you let it sit on its side at an angle and dry out ofter for a few days.

That did it! I removed all socketed chips and put it on a dishwasher. Then cleaned with IPA. Also resoldered everything in cpu area. It's been up for a day running demos and stuff. No issues so far. Hopefully it will last.

[Acill]

That did it! I removed all socketed chips and put it in a dishwasher. Then cleaned with IPA. Also resoldered everything in CPU area. It's been up for a day running demos and stuff. No issues so far. Hopefully, it will last.

I've got several working again after a good clean like that. Oxidation causes resistance values to change, getting all off and cleaning sockets helps a lot. A more drastic measure is a complete resocket and replace all the components in the battery area.

[papa_november]

I just ran into this issue - blank (real black) screen, one brief flicker then back to black. Power LED blinks like the system just crashed, but blinks out a pattern of 10 short blinks and one long.

I replaced all the CHIP RAM thinking it was that, but what it really was turned out to be a bad single-wipe socket(kind of a redundant statement, they're all bad by default) on the U300 CIA.

Moral of the story: If chip swapping doesn't work, get rid of all the single-wipe sockets before you go any further, even if they look good.