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I don't have a solution, unfortunately, but your problem is nearly identical to mine. It even seems to have happened on the same date (7/27/12)! Do you live near Dener by chance? Anyway, we have Direct Tv, and ended up with 2 fried HD DVR boxes and 2 TVs on which the HDMI connections don't work after lightning hit close to our house on 7/27. Those boxes were replaced, as was part of the Direct TV dish. The only difference is, whereas on one TV component connections (red/white/yellow cables) allowed the TV to work normally, on the other (my 50 inch Panasonic Plasma TCP50S30) even the red/white/yellow cables did not work. Now I'm scouting the net for tips on what else to try before I possibly have the Panasonic looked at, which I am hedging on doing since I got it for only $600 new in the first place. Have you found out anything else since you posted this? Good luck to you...
As crcelect suggests you can run the TV on RCA. You should also be able to use coax directly from your cable box. If you don't have cable you can use an rf converter to connect coax.
I have exactly the same problem with my Panasonic TH-42PX75U. I've been told that I may need to run a setup on my cable box to fix the problem. If I find a solution I'll provide details in a future post.
I should be channel 3 or 4. This assumes that this coax cable is coming out as a TV R.F. connection of a Dish Network Box (Satellite Receiver) intended for direct connection to an old fashioned NTSC (channels 2-13, 14-83, possibly even has cable channels depending on how old?) TV.
If this coax is the output of a coax going directly to the Satellite Dish or through what might might look to you like some kind of fancy splitter (called a Multi-Switch) the you WOULD NOT want to hook that to your old NTSC tv. The frequency is too high ... etc. etc... you would need Dish Box (as you call it) a.k.a. a Satellite receiver - with a good and active satellite card from your provider.
the problem is not the cable into your house, but the amplifier it self, if the amplifier is not been powered if a rightful voltage, that can happen. if you are not happy with the output than take your tv to a repair shop, so that an amplifier can be worked on.