If it's not your TV, then it's your game. Are you sure you copied the CONFIG file to the proper place? What I think is the problem is that you're still getting the black screen bug.
Another possibility is a faulty controller. See, when a PS3 launches a PS2 game (be it on official or custom firmware), the console boots into emulator mode. This means that the PS3 sort of turns off and turns on again. The same goes for when you quit a PS2 game on a PS3. This means that your controller will turn off as soon as your PS2 game launches or closes, and you'll need to turn it on again. Maybe your PS3 isn't recognizing your controller once it's in PS2 emulator mode. If have a different controller, you can try using that.
Anyway, if you manage to get another PS2 game working, it's the black screen issue for sure.