I've posted this at AA and on the Sega-16 forums as well so if you already seen my praddle on about this I apologize and you can ignore. That said...
I noticed about 2 weeks ago, something odd on my Genesis/32x/SegaCD combo setup. Basically after the system has been on for about 30min to an hour, there appears to be a great deal of heat built up inside the Genesis itself. I actually measured this with my Fluke temp probe and the ambient air temp in the Genesis reaches about 112°F around the AV port. That seems excessively hot to me but perhaps not?
The specific issue this seems to cause is that video overlayed from the SegaCD itself will show up with a snowy like pattern on the screen. But only from the video from the SegaCD itself. I've posted a link below showing the effect. Basically at first when you power everything on and look at the SegaCD bios screen everything appears normal. Then after some time, it will produce a horrible graphics corruption issue as is shown second in the video. Then, if I remove the 32x completely from the system the video is normal again.
Now I have found out that the 32x appears to be the cause. Not sure why, but it is. In the video, the actual video you see on my TV is using the AV out port on the Genesis itself and not from the 32x. However the same results appear from the 32x AV port as well. So the video corruption isn't from the 32x encoder but somehow from a combination of the 32x being attached along with the SegaCD.
So far this graphics corruption isn't actually seen in games with the exception of those using FMV. As an example notice in the sega CD bios screen the graphics issue is only within the window frame of the bouncing Sega CD logo and doesn't affect the text graphics outside that? When I play Sonic CD with the system warmed up and doing this, the graphics glitches are present within the window showing the Sonic CD cartoon intro, but not outside the frame of the intro and do not appear at all within the actual game. Even on the bonus stages where the rotation and scaling effects are being used do not show this issue. Normal cart games are fine as well and if I remove the 32x, the Genesis doesn't seem to get as warm and of course the graphics issue from the Sega CD doesn't appear at all.
Has anyone seen anything like this before? I'm trying to get ahold of another 32x base unit for cheap that works to see if it is the 32x actually causing the issue or something within my genesis somehow.