Having the lamp burn out in your flat screen TV can be a very annoying thing to deal with. Good thing for you this is a simple thing to replace on a flat screen. All you will need is a screw driver and a few minutes to complete this task. You may have to order the lamp through your TV dealer, but you might be able to go to a super center.
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Remove the TV from the wall and lay it down flat so that the back is facing up. Be gentle when removing the TV so that you don't damage it.
Remove the excess panel from the back of the TV. Set the panel aside and put the screws on the panel so that you don't lose them.
Remove the burned out lamp by lifting the small metal handle on the lamp and pulling it out of the fixture.
Insert the new lamp by gently placing it into the fixture so that the small metal handle is facing out. Replace the back panel to the TV and mount.