Error code 50 is a problem with the keyboard 6522 VIA chip. I would start there by re-seating the chip. Make sure the chip is firmly seated in the socket. I had one I/O board where the chip would practically fall out of the socket. Failing that, you can try swapping the two VIA chips on the board. (The other is for the parallel port) If the problem follows the chip (i.e. you get an error code 51) then you know the chip is bad.
A listing of the error codes can be found in the following document: http://www.1000bit.it/support/manuali/apple/lisa/lisaSUNREPAIR.pdf
-Blair
On Feb 12, 2008, at 10:57 PM, byestan wrote:
>
> I was the guy who posted the message about cleaning up the battery
> leak. I reported that the machine would not power up after the
> cleaning. So tonight after kicking myself for missing out on a
> complete board set for $45 on eBay. I decided to try reseating all
> the boards one at a time. It was encouraging and strange. Sometimes
> it would power. Other times it would not. It turns out it was the
> switch on the power supply for the back lid. I just kept working it
> over and over again. There must have been corrosion. Because it
> powers now!!!!!! It's still busted. But at least it tells me what is
> wrong. It has the bad i/o board message with a 50 below it. What
> does that mean?
>
> >
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. Received on 2015-07-15 16:42:52
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