Turn on set picture is fine for 10 to 20 mins then half the picture goes to lines stares with red horz lines and goes to white vert lines after 20 mins.
Sounds like power supply regulator board fault. Check all the electrolytic capacitors for any leaked or bulged one. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis.
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