Toshiba 37AV555 on screen disp ok but no pict

[evimarn]

Hi have problem also: got this toshiba 37av555 with main board probs no pict and sound for a second or two, so I just replaced the board with one from ebay being promissed that it is good.
Put it in and now I have only osd and sound ok but no picture.
Any help is greatly appreciated.
Nic