Few if any TV techs show up so I share this so you know what you are in for.

First you need some background in electronics repair. If not, you arrange for repair. I've yet to find any TV tech reply since many will insist the diagnosis be correct. It can't be without the TV on the bench with the usual service manual, spare parts and test gear.

If you have the background see if you can get the service manual from www.samsungparts.com and read what it suggest for no power.

While you get that, read more at http://www.shopjimmy.com/tv-repair-tips