Disconnect the power cable from your projector. Allow it to cool for 30 to 60 minutes. Lay the projector upside down on a table.
Remove the lamp cover, typically located on one of the rear corners of the projector's underside. Depending on your projector, you will either have to loosen a few Phillips screws or press on one or two plastic release tabs to remove the lamp cover.
Loosen the screws holding the lamp assembly in place. Grab the assembly by the handle and slide it out of the projector.
Slide a new lamp assembly into the projector. Don't touch the glass on the bulb because it will damage the bulb. Tighten the retaining screws on the lamp assembly and replace the lamp cover.
Turn the projector right side up and reconnect the power cable. Power on your projector.
Unplug the TV from the outlet. Let it cool for 30 to 60 minutes.
Remove the lamp cover. On most rear projection TVs, the lamp cover is located on the right or left side of the TV's rear panel. Remove the cover by loosening the screws and pulling the cover away from the TV. Certain manufacturers, like Mitsubishi, have the lamp cover in the front of the TV, near the left speaker. To get to the cover, you must first use your fingers to pry off the front panel below the screen, revealing the speakers and lamp cover. Loosen the screws on the cover and pull it away from the TV.
Remove the lamp assembly. Loosen its screws, grab the handle and slide it out of the TV. If you have a newer Sony model, there are no screws. Instead, press the release tab to unlock the lamp assembly and slide it out of the TV.
Slide a new lamp assembly into the TV. Don't touch the glass on the assembly, as the oils in your fingers will damage the bulb. Tighten the screws or pop the retaining tab into place.
Replace the lamp cover and front panel, if necessary. Plug your TV back into the electrical outlet and power it on.