I went away for 4 days, and my daughter "forgot" to tell us that she turned the TV on before we got in the car..It was on a bright blue screen (for those in the UK, think Sky TV guide) for the enitre time....Had no issues with it since then and thats not the first time it happened either...

And I have an old school JVC plasma, so I doubt if the newer ones would experience any burn in issues...

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Been there...Done that