Advice about repairing an IBM 5151

[Fred Cisin]

On Sat, 29 Aug 2015, william degnan wrote:
> often the card is the culprit, sometimes shorting out the entire sytem.

Absolutely!

And, if the motherboard is set for CGA, instead of MDA, the board might 
not come up.  BUT, he did say that he had what the thought might be video 
signals reaching the monitor.

In addition, VGA boards can be problematic in configuration.  When 
bringing up a PC of those vintages, I try to always start with a CGA board 
and appropriate monitor.  THEN, once that is working, THEN put the VGA in.