Are you trying to use it with an Amiga?
When I connected a TFT screen to my CV64/3D + scandoubler, I discovered that the TFT apparently was more sensitive than CRTs - or that the scandoubler probably just almost doubled the scanrate to 31 kHz. The TFT sometimes worked, sometimes it went blank, all while using the same screenmode (it worked flawlessly with any other computer).
But I can't remember if I couldn't even get to the built in menus.
