techwood TWP 4210 split screen fault?

my techwood tv screen has just gone could anyone tell me which board needs replacing? the screen has a full picture and perfect sound, but the bottom half of the screen is showing a shadow of the top half. (eg: if there are two people on the screen stood side by side and the picture is showing from the waist up it shows the full picture on the screen but the bottom half is showing a shadow of the top half ie: from the chest up) ive been told that a board has gone but im not sure which one needs replacing.i can get hold of the boards but not sure which one to order and the place supplying the boards only supplies and doesnt know. could any one please help me or point me in the right direction to where i can find out the board i need. thanx.