On 8/22/2010 12:19 PM, Richard wrote:
In article<4C7160FF.4060009 at gmail.com>,
Mike Maginnis<mmaginnis at gmail.com> writes:
Can anyone suggest a starting point for tracking
this down?
I'm not familiar with the Apple III schematics. Does the motherboard
include video?
If so, then it sounds like everything's good but you have a bad video
section. I'd start looking at capacitors and if you have a high
bandwidth scope it might be instructive to look at the video out to
see if you're getting any sort of video timing at all (sync signals,
etc.).
The motherboard has both composite and digital XRGB video outputs. I've
been working with a composite monitor, as I don't have a compatible RGB
model. Unfortunately, I don't have a scope or anything more advanced
than a multimeter to troubleshoot with.
- Mike