yea, its the same thing with mine.
If i first turn mine on, it works perfect.
After it runs for a little bit, the picture will slowly shrink, it looks like a scrunched 16:9 when it happens.
If i keep a boxfan blowing on the chassis, it stays full raster.
Here is my other one:
http://linux.hamilton-city.k12.oh.us...storation.html
I wrote a whole website on my other one.
(there is an AVI of this set working, PS this is the one with the bad yoke, you can see)