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Check your manual for resetting the TV to 'Factory Default'. I have heard of this happening before. It may need you to press a combination of buttons on your remote. Usually you have to be pressing the buttons in sequence with the TV in standby, then wait for a service menu to appear. Look through this menu for the words 'Factory Reset'. It may be in a sub menu. The TV may well switch itself back off and then on again. At which point your problem should have gone away.
It might also be a bad solder connection, short of checking voltages what I have done in this type of situation is with back off use a small fairly high speed fan - a hair dryer set to cool works, to cool areas of the boards inside to localize which board is causing this, with the set in failure, got it? it goes out cool it with a handheld hair dryer with air set to cool, when you find the spot where the problem is it will either instantly come back or try to.
Do it a few times to confirm which board is bad and locate a replacement board and swap it out.
prima lv-3228p lcd tv-after 15 mins of play the screen goes funny and there is still volume but the remote will not function. you cannot even shut the unit off, only by disconnecting the power supply. If you wait 15 -20 mins and plug the unit back in it will work for approx 15 mins again- then it will start acting up again?/
Press and hold the menu button (either on the remote or the display itself). Other forums have said you only have to hold it down for 10 seconds, but that isn't accurate. I had to hold my menu down for about 30-45 seconds to unlock the OSD.
check with the dell company they might be able to help you with a manual.if they cannot go to www.partstore.com good luck.to enter into service menu push down both up and down chammel button together and the menu will pop up,from there you can toggle it with you up and down volume button.