Have been fiddling with an Atari 800XL I bought a couple of months ago from someone in England, so it's a revision D PAL unit that I'm using over composite (from retrocomputershack) on my LCD (no space for the old CRT thingies) with one of Lothareks PSUs. Have been looking at the posting on http://atariage.com/...rs-ntsc-vs-pal/to help debug some color issues I'm having, essentially the wrong colors substituted in the middle of the spectrum. I can adjust R38 back and forth and it'll either go totally out of whack or B/W, don't have a scope though so I've tried using small increments. The closest I get on the startup screen is what I can only refer to as DOS blue though my XLF, extreme jailbars aside, looks more like teal.
I've replaced all 4146 RAM chips (mostly dead MT4246 originally), GTIA, ANTIC, 4050 with CD4050BE, PAL crystal, 2N3904 transistors as well as all electrolytics without any significant changes to the colors. Picture below is from SALT 2.05 running via a SIDE2 cartridge, have also tried using a basic script to show all colors and hues where I'm seeing the same "repeat" of colors in the middle. Anybody got ideas any ideas on how to explain this?
NB! LCD works with ZX Spectrum, Acorn Electron, Commodore 64, Commodore 128, Dragon 32, Atari 520STFM, Amiga 500/600/1200 with some duplicates (which is probably why I've got storage problems). Never seen anything like it so I think it's something to do with the circuit.