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P8 denotes a fault related with its power supply regulator board. If you wish to get more details about the error codes to Mitsubishi, check this link. http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or
type in thebrand name and model number to of your set, to its
search box, and press 'Enter' or view it in Mosaic /
Power down the TV. Let it cool down for several minutes
to avoid touching anything hot. There are many parts inside the TV that
could be hot.
Unplug the TV and all media devices attached to it. Let
the TV sit again for several more minutes just to be safe. The lamp
receptacle and other components could still be hot.
Unscrew the back cover of your TV with a screwdriver.
Have someone help if the cover is big. The lamp's housing unit on most TVs is located towards the bottom. Refer to your TV Owner's Manual
for specific instructions.
Unscrew the lamp's housing unit with your screwdriver. Take
your time to avoid damaging the housing unit. You'll see the lamp once
you open the housing unit.
Use a soft cloth to unscrew the lamp out of the housing
unit. There's a possibility the lamps- could still be hot. The cloth
will help protect your hand.
Screw the replacement lamp into the housing unit with the
same soft cloth. The oils from your fingers could ruin a rear projection
Reattach the lamp's housing unit and TV back cover. Make sure no wires are loose or get caught when screwing the back cover on.
Attach all media devices like cable or satellite boxes. You should now be able to watch your TV with a brand new picture.
The inverter pcb inside the tv has probably gone bad. The inverter lights the small fluorescent tubes behind the panel for back light. Take a bright flashlight and hold it close to the front and see if there is any picture. You have to be patient with this method and look real close. If you see the picture it is definately the inverter. Common problem. Thanks