Hey guys. I've seen a lot of good help on this forum that I've used to help me diagnose my Atari 2600 4-switch that has not worked ever since I tried to install a widely used composite mod. (Kit Link Here) I installed it using an instructable (Instructable Link Here) I followed all instructions including removing q202, r209, r222, and c205, aaaaand... nothing it didn't work.
(note: when I say nothing, I mean the TV says no signal.)
I suspected bad connections but that wasn't it. I tried re-soldering the old components and that did something for a while but then it stopped. Next I thought that it wasn't getting enough power so I checked the power supply and 5v reg. Both were just fine except the 5v Reg had 2 of it's pins crossed. After uncrossing them I got some video for about two seconds and then it quit. (see attached video) I thought it was the chips now so I replaced all 3 (TIA, RIOT, and CPU) and this put me back to the same old no signal screen. I tried the old chips on a working system (w/o composite mod) and they gave a black screen.
Not sure what to do at this point. Nothing is abnormally hot. Maybe my somewhat noob soldering skills maybe be a problem