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Hello , my name is JackPerhaps I can help you with this problem but first i would have a few questions like what would be "the" capacitor in question and the tv`s model number so could you please send me a reply when you are ready to proceed ?By the way , this is NOT an answer so there is no need to rate yet.
What is the tv doing now if anything ?
by the time you replied to me I was gone for lunch
O.k then I`ll start by saying that there are a few hundred capacitors in your tv so .......
This number should be associated with the model number PN43D450A2DXZA , can you verify that on the back cover ?
Right now the power board would be a good candidate but a few questions first and perhaps a reset ;
Did it quit while watching it or simply would not come on today ?Any electrical storm or power blackout in your area prior to this ?
Here is something for you to try ;Unplug the TV's power cord and hold the power button directly on the tv ,keep holding it for 20 secs or so then let the tv sit unplugged for a couple of minutes before you try it again.Although i do not expect much out of this procedure , it has to be done to confirm that this problem can be cleared or not with a reset.If that does not do it then we are looking at internal problems with the tv.
let me know how that goes.