Is the present TV 12 volt? You cannot convert one that I know of as most run on higher than 12 volts. If youl were going to do that the best way would be a small inverter sized big enough for the current draw of the bigger TV. You can get them in all kinds of sizes that will plug into a cigaraette lighter (12volt outlet) so you can use a standard TV. The only issue you run can run into is that some TVs do not like Modified Sine Wave (MSW) inverters which the cheap ones are. Then again I had a cheapo 700w inverter from Harbor Freight in our first motorhome that did just fine running an Emerson LCD TV.
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