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.
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!