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Check the fan. Once the
television is turned off, it is just normal for its fan to become louder.
A projection TV actually depends on its lamp, which requires cooling so
that it will not prematurely burn out. If the room where your TV is placed
is very hot, the fan would also continue to run.
Replace projection lamp. To properly do this,
make sure that the lamp's bulb has cooled down and the TV is unplugged.
Carefully remove the cover of the lamp's compartment using your screwdriver
(Phillips-head). Unscrew the sealed part of the lamp that can be found at the
television's rear part. Take away the old lamp cartridge and then insert a new
one. Seal the lamp with screws, replace its cover and then screw tightly.
look for 1 of 2 lights in front of the tv. after the tv shuts down completley mine would turn back on for another 30-45 min after a good cleaning it will stay off and give a "power light" not Lamp light 2 flashes. I'm waiting on some help myself. But if it's the lamp light you'll need to replace the lamp....approximitly $600 from what i've read so far.
have a tech clean inside cabinet and replace bulb , should be under warrantee if under 5 years old just had mine done free of charge from panasonic call 1 888 843 9788 they will direct you to a dealer. hope this helps
Most likely the Li-Fi lamp is bad. If it is and your TV is less than 5 years old the lamp is covered under warranty by Panasonic but must be replaced by a Panasonic dealer. If its less than 2 years the labor is also covered. If its less than 5 years old and it appears the lamp isn't firing I would contact Panasonic to have a technician look it.
Most likely problem is bulb failure. Replacing the bulb is first step in any LCD rear Projection troubleshooting.
PT-61LCZ70 has a special "Super Dooper" long life lamp that costs a ton to replace. US users have 5 year warranty on the lamp assembly. Canada users can whistle for help from Panasonic Canada. There is no replacement bulb available, only expensive lamp assembly.
TV has to be completely taken apart to change the lamp. Panasonic service information is 12+ pages for lamp change instruction.