Re: IIc stopped working - white bars across screen

[Michael Black <et472@ncf.ca>]

On Sun, 8 Jan 2012, Michael J. Mahon wrote:

> Eric Rucker <bhtooefr@gmail.com> wrote:
> > There a good way to tell which chip is bad, given that it won't come up
> > to the self test, or should I remove one, install a socket, install a
> > fresh chip in there, and test, and do that until all of the MRD chips are
> > replaced? I hate working on //c motherboards, easy to lift a trace...
>
> You can try piggybacking a known-good chip on each DRAM chip. This doesn't
> work for all failures, but it works for many, and can save a lot of work
> (and risk).
I once found the bad ram in my Atari ST simply by checking the touching 
each of them.  One was noticeably warmer, changing it fixed that problem.

I know the failure was overvoltage, the power supply had a problem before 
this RAM issue came along.  I don't suppose others would be so lucky as to 
have the same sort of failure.

  Michael