I just picked up an Atari 800 from EBay. The thing seems to work mostly, however when I noticed that I first hooked it up to an S-Video to VGA adapter, the screen got very white, washed out. At first it almost looked like it had no color. I played with the POT adjustment and got a little more blue out of it, but it still doesn't look like my 130XE. When I hook up the S-Video to a regular TV, I thought it looked better and was thinking the signal strength of the Atari 800 was over powering the S-Video to VGA adapter. But upon further investigation, some of my Red isn't really coming out right. Playing MS-PacMan, there is absolutely no pink at all even when I play with the POT adjustment. My Pinky ghost is white! The walls never get full red. There is no self test on the 800 so I am not sure what utility yet to use to display a full pallet of colors to see exactly what I am missing though.
If I connect Composite out to a monitor / TV, the colors look fine. So it is just the Chroma and Luminance that is not displaying reds properly and seems to give me a whiteish washed out picture connected to a VGA converter. All of the black background becomes whitish too instead of a picture on a black background using this adapter. The same cable combination on an Atari 130XE is fine.
Does anyone know where to begin troubleshooting what is causing this? I bought an Atari 800 for four joystick support, but it bothers me that the colors are messed up. Any help would be great.