Re: I/O Board not working?

Hello,

if I understand that correctly: You tested the probably corrupted I/O Board with a replaced COPS chip and it worked? So the solution will be, the COPS is weak, leave it replaced and it will work.

By the way, the main reason is: Sometimes the contacts of the Lisa- case are bad due to corrosion or they are simply dearranged and have no contact if a board is plugged in. Check that carefully and try your I/= Board again if it's not the COPS-error.

The second error could be a weak power supply, which could mount a board so or so, but when started with another board (which consumes a little bit more current due to perhaps leak caps) it will fail to get in overcurrent position and your Lisa won't boot.

greetings TOM from Bavaria, the country of the marvellous Alps, the castles of Koenig Ludwig, Neu Schwanstein... and of course the original Octoberfest in Munich... which starts soon :-)

Am 31.08.2017 um 03:22 schrieb austjeremy_at_email.domain.hidden:

> I/O board is not working. I removed the corrosion, repaired the
> broken tracings. The board was working perfectly yesterday. I
> tested another good COPS chip, and the one the board is fine. I
> tested all the other components in the Lisa with my other one. The
> computer powers on great with the I/O board from my other Lisa. I
> don't get any error, it just will not power on. Like I said,
> everything was just fine, then just would not turn on. Any ideas?
>
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