Re: IIc stopped working - white bars across screen

["Bill Garber" <willy46pa@comcast.net>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
925903782347773742.023602mjmahon-aol.com@news.giganews.com">news:925903782347773742.023602mjmahon-aol.com@news.giganews.com... 
> 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 tested my IIc's ram that way when I needed to, and it worked every time. 

The last time, I actually just soldered the new chip onto the top of the old, 
pin to pin, being careful of course, and it works to this day. If I recall, it 
was well over 3 years ago. 

Bill