Re: lisa 2 startup problems

Hi James,

you might be right, I first thought of an electronic problem because the board stopped working while it was connected to the LISA, it started up fine and it suddenly stopped working.

I will try to make a diagnostic for the board again, the problem seems not to be related to either one of the socket-ed chips and I am happy the COP 421 is not damaged since I have tested with the one from the working board and I got same results. I will test this evening again everything and keep you posted.

Thank you!
Alex

joi, 10 ianuarie 2013, 08:22:39 UTC+2, James MacPhail a scris:
>
> >The IO Board is dead again.
> >
> >with the other IO Board, everything works fine.
>
> I'd guess that something physically happened to the board, rather
> than electronically.
>
> Can you recall what you did to the I/O Board between the time that
> the board worked and when it stopped working? That may provide a clue.
>
> You recently found a couple of traces that needed repair, so check
> that area, and you swapped out the RAM chip(s) on the I/O Board, so
> check that area too. In other words, check the areas where you might
> have disturbed something. Also look for a solder splash or damaged
> trace.
>
> Good luck!
>

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