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I have never heard of or seen a "power down button". Unplugging the TV and holding the power button for a minute or so sometimes will do a hard reset on the TV, is that what you seen?.
On your problem, chances are there was a spike that came down the power line when your power went out and it took out at a minimum the main fuse in the TV, you can remove the back and replace that fuse on the power board and see if it comes on or blows the fuse again, if it blows then look for a bad rectifier or shorted FET transistor in the hot section.
I hate the fact that there are multiple problems listed, for just one problem. Need to post ALL information in ONE product problem. NOT a TV man, forget replying to my previous query.
For the 32AV502R in particular if you can't find a replacement main board or if you are not actually certain the problem is in the main board to begin with it may be worth checking the failure symptoms and proposed repair service offerred here:
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