This happened to me yesterday. My daughter put a penny and a dime in the SD slot and none of the buttons or volume were working on my TV.Only the power button would work.
I fixed it by simply removing the penny and dime out of the SD slot and then i held the power button for 10 seconds. After I unplugged the TV from its power source for 5 minutes and then plug it back in. When I turned the TV back on everything was back to normal.
For a second I thought I was going to have to buy a new TV, lol. Hope this helps. If it doesn't work the first time then try it a second time.
By the way I have a Panasonic PT-52LCX66 LCD Projection TV..
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