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that it is likely a power supply problem. It starts with a loud popping
or crackling noise and then the set goes dead, except for a flashing red
light on the front. best thing to do here is to unplug it from the power for a good min or 5 make sure the TV is not hot and try plugging it back in , also Plasma TVs and Samsung have had this problem for a long time this is the info i found for you.
The Panasonic Viera 50-inch plasma TV has received rave reviews from the
media and consumers alike. Panasonic encountered problems with its
plasma TVs last year, both due to degradation of the picture quality
over time, which was much publicized due to a class action lawsuit filed
over that defect, and for a power supply issue that was far less
publicized, but for which there are many negative reviews online. So far
this year, though, the reviews have been much more positive. I would
like to share, however, that my experience has been less than positive
in hopes of helping others who have had the same problem and in
providing another viewpoint for those considering purchasing this TV.
It seems that your unit has some sort of Thermal PSU fault, or a problem that is shutting down the Power Supply Unit, PSU. This happens so that no further damage, and possible fire will occur. After it shuts down and the faulty component(s) cool down, it restarts again until it once again goes critical and shuts down again only to repeat the cyle.
You need to take the unit to a reputable service centre/man and ask for a firm "Quote" for the work to be done.
I have the same model as you. Plug in the transmitting unit into a good working power outlet. Make sure you have the audio connected to a loud source. Turn on the source device producing the loud audio to be transmitted to your headphones. Now see if the transmitting unit's LED light is on. Check headphones for audio. (May have to tune in the headphones and adjust its volume as well). I recommend that the source of your audio have its built-in speakers off, while still providing audio out to your transmitting unit, via an external audio output. Check your source manual or look for audio jacks on the front or back. There may be a setting to turn this on and for the main built-in speakers to be turned off as well.
If this does not work, unplug the transmitting unit, and then plug it back in again, after waiting for about 10 seconds - all while audio is being provided to the unit. It should come on.
Remember that if the audio to the transmitting unit is quiet OR off for about one minute, the transmitting unit will turn off and you will hear FM noise, loudly, on your headphones. This is due to the "lack of audio" timer built-in to the transmitting unit.
warranty not worth the paper it is written on
under warranty it is not a requirement that you fit/ fix anything
the only option is to take it to a repair shop for a diagnosis and quote and then decide if the power hungry plasma set is worth repairing
LED sets use 1/10 the power of plasma units so an upgrade will save money
Pioneer has a power supply recall on some models. Do a search and you will find a number at Pioneer and they will replace your power supply for free. The loud popping noise and then nothing is a common problem with these. Hope this helps! http://www.pioneerelectronics.com/PUSA/Support/Important%3A+Updated+Information+Regarding+Free+Power+Supply+Replacement+for+Certain+Pioneer+Plasmas
It does sound like a power supply problem but that can be misleading because a problem somewhere else in the TV can be "holding down" the power supply. This can usually be determined by using some isolation techniques.