Austinpatton16

I don't have an atari adapter, but i have tested the vdp by getting a composite signal directly off the chip, bypassing the rf box entirely. To clarify, i can use the controller and i can hear the game and it sounds like its playing fine(i hear jump sounds when i press jump) but i have a white screen.

I just bought two 2 broken colecos, 1 i get a white screen with audio and the other i get a black screen with blue speck and garbage audio. Atm i want to focus on the one with the white screen. I put donkey kong in it and a white screen comes up and i press 1 on the controller and the normal music plays. I have hard wired siwtch on so the switch is not the problem. Nanochess in another thread said "You can connect directly a composite RCA to the video output pin of TMS9928 for testing directly VDP, a good VDP always generates synchro right for NTSC." I wired this and a got a white screen, so i think we can rule outa bad vdp. I tired benhecks composite mod and recieved the same white screen, so the rf box must work. Any other things that i could test/be the problem?