There is a memory chip on the motherboard specifically for that purpose, it's soldered in but it can be replaced. We were quoted almost 200 bucks to fix ours so we opted just to replace the TV. You could opt for a battery backup on the TV to keep power to the board when the TV is off, but some units can cause a buzzing noise on the TV and a good battery backup with a Pure Sinewave will cost as much as fixing the TV... but if you happen to have a battery back up laying around, you could test it :-)
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