But there are such discussions in other forums so try other forums (AVForum?)

That said the display starts at the mainboard and from there cables and driver boards to the LCD. So it's from there to there. I must write that you should not fall for the TCON advice here since a large display should have two and for both to fail is unusual.

The service manual would be needed so to check out the power supply. That manual is about 12 bucks at www.samsungparts.com for the US and ask at samsung.com where for other countries. To me that 12 bucks is a test to see if the tech is serious about attempting the repair.

Also a nod to http://www.shopjimmy.com/tv-repair-tips