22 Aug
2010
22 Aug
'10
8:10 p.m.
On 2010 Aug 22, at 12:05 PM, Mike Maginnis wrote:
On 8/22/2010 12:19 PM, Richard wrote:
I've deleted the original message already and I don't remember exactly
what you said you had done, but how about typing blind something like a
'beep'/sound command or disk-loading command to see if it evokes the
expected behaviour. Might be able to confirm whether the system is
running and it is a video problem.
I don't know the Apple commands well enough to suggest the specific
command.
In article<4C7160FF.4060009 at gmail.com>,
Mike Maginnis<mmaginnis at gmail.com> writes:
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. 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.).