Long time lurker, first time poster. I recently got back into the Atari scene and bought a 130xe of fleabay and it works gloriously. So I pulled out my old 1200xl, connected it to the AV2HDMI and get a blank green screen. It is acting like it is not even loading. The AV cable/adapter/monitor works on the 130xe and my TI99/4A so I know the cable is good. I attempted at adjust the color with R48 adjustment on the board hoping that I could see the self test or the notepad. The colors shift change so I know I am getting a video signal from the unit.
When I was a kid I bought a 1200xl keyboard from Radio Shack and found one of the IC had some sort of sync issue. The video image was shifted. If a certain IC was tapped with a finger it would shift to the center of the screen, and would stay centered for months. When it shifted back I would open it up hook up my keyboard and tap on the IC and low and behold it would shift back. Of course that was 35 years ago and I don't remember which IC it was. I assume this has finally bit the dust and it needs to be replaced. The question is which IC it might be and can I get a replacement.
Thank you to everyone.