Plasma TV sony sony ke-p42m1 starts flikkering

[itstallion]

Hi gentlemen,

I am new on this forum and i need your help.
i have a plasma TV sony ke-p42m1 ..When cold, no problem.. everything goes well.
After a while, the screen starts flikkering and i have snow and lignes with different colors and screen flikkers!!!
It's ca be interpreted as a temp. problem.
That's why i removed the rear covers and placed a big fan to cool down the temp on the tv platines..
No way..problem stays on screen.
Do you have any idea??

Thanks in advance

Ciao