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Author Topic: no power to motherboard  (Read 1980 times)

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Offline mechy

Re: no power to motherboard
« on: September 22, 2015, 12:49:45 AM »
Quote from: rvo_nl;796036
Hi guys, could use some help. Foe years I've had a nice working a1200t. With a lot of expansions, all working in harmony. But for some reason, my motherboard stopped working. After finally finding a new (recapped!) one, I was installing my expansions one by one. This all went perfectly fine. Until I plugged in my PPC + Bvision and hit the power button.

Nothing. Just the HD spinning up. Basically no power to the motherboard. No keyboard led. No output to my television (was still using RF output at this point). Removed PPC, and all expansions one by one. Same result.

What is wrong here? tried with another PSU, same result. It is driving me mad. I've waited for months and now still have no working Amiga :( I'm an electronics n00b, can not do any measurement. How can I proceed? Does anyone have a similar experience? Name anything you can think of, because this one is not so straight forward I'm afraid.

Strip it down to a bare board, start with only the motherboard and power, no HD,accelerator or addons. etc, If that doesn't power up, it has to be a problem on the motherboard. If it does work, start adding items back one by one until it quits.

do you have any details on the recapping of the board?

Mike
 

Offline mechy

Re: no power to motherboard
« Reply #1 on: September 23, 2015, 06:54:33 AM »
Quote from: rvo_nl;796143
so uhm..



it's alive! again!

your guess is as good as mine. took out the motherboard. powered on. worked first time. curse you, old computers!

seriously, I think I know what needs replacing:



right now I'm very happy its still working. and even more happy that my ppc is not faulty :)


Could something on the board be shorting to the back of the tower case when it is installed? maybe cap leads sticking too far out of the back? or was it something to do with the cabling in the above picture?