Samsung 46" LED - backlight, or power problem?!

Just like many people, my tv started crapping out on me after about a year and a half, outside of warranty. Basically, the screen suddenly went very dim, as though 'power saving' mode was turned on. But of course it wasn't.
If I turn the backlight down very low, the brightness will kick back on, and as I turn up the backlight, the brightness starts wobbling like it's struggling to power that much light - then if I go high enough it dims dramatically again. If I mess with power saving settings it does the same thing, flickering dim and bright like it can't get enough power.
So, would you say it's a problem with the backlight itself, or a power supply issue? Or the classic, dreaded 'capacitor' problem?
Any help appreciated. Thanks!

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The end run.

Extend the warranty, wait 30 days (31 to be sure) then call it in.

As to the cap issue, this is not the symptom for bad caps.

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RE: 46" LED

I'm sorry to hear this. Can you please send me an e-mail with the model and serial of the unit, I'd love to look into this and see if I can help in any way.

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