Replaced the Tcon and inverter...still no video :(

Samsung LNT4066FX/XAA - When i turn on the tv the screen is visible for about 2 second. Then it flickers and goes black. The sound is OK, no issues there. Ive tried different inputs with the same result. I ordered a new T-Con and inverter from an online source. These are supposed to be tested and 100 percent functional.Anyways, Ive replaced both parts and still have the problem. Ive replaced one new tcon with the old inverter and vice versa. Im out of ideas, hope you guys can help before im forced to buy a new TV. (NOT A SAMSUNG)

Thanks

DS