I had a problem like this before as well, but with my Samsung LCD. I was getting prepared to replace the TV at a substantial cost, and went online to look at the different brands available. While I was doing this, I stumbled across a Youtube video of a Samsung with the same power up problems I had, and then another video of a guy actually fixing the problem. Turns out it was a very common problem, and the solution was to open the TV up and replace 4 capacitors that had blown. Seeing as the capacitor fix was ~$6, and the TV was already broken (couldn't break it any worse), I spent the hour at the electronics store, followed by 30 min fixing the TV, and now it's totally fixed, no problem.
My point - even if you do replace your TV, check out Youtube to see what you can do to repair it. TV repair - with the right instructions - is actually pretty easy.
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