There can be a number of reasons why a rear projection TV set won't turn on, but overheating and a burned-out bulb are among the most common causes. You will need to wait for an overheating TV to cool down before it will turn on, but you also need to discover the cause and fix it if that is the issue. You can also replace a burned-out bulb yourself. Any other problems will likely require professional help, and these steps can vary depending on the manufacturer
Cleaning and Inspection
Check the power cord, and make sure it's connected and plugged in. A number of sets require the cord to be hand-connected directly to the set, and sometimes it may come loose at that end.
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Change the outlet the set is plugged into, to make sure a faulty outlet is not the cause.
Make sure there are at least six inches of clearance on every side of the TV set to allow proper ventilation.
Clean out all dirt that has built up within the air vents, which may have caused the set to overheat. Compressed air works best for this. Wipe the vents' surface with a cloth. Make sure the TV is cool before turning it back on,
Unplug the set once it is completely cooled down.
Slide open the access door to the bulb in the rear of the TV set.
Unscrew the bulb from its holder. The screws can vary from ones needing a screwdriver to thumbscrews. Pull the bulb down and out of the holder; you might need to grab a handle on the holder.
Install the replacement bulb in the holder, using rubber gloves or a rag to prevent oils from getting on the bulb glass. Tighten the screws finger-tight, making sure the bulb is secure.
Close the access door, and plug the TV set back in to the wall or socket strip.
Things You'll Need
Rear projection TV bulb