Tv is 4 years 1 month old. it is watched daily. the line goes away some times. then just comes back.
It could be either the SD or SU boards going. check the cable connections and make sure the ribbon cables are seated properly.
SOURCE: I own a Panasonic plasma
http://www2.panasonic.com/consumer-electronics/support/VIERA-Plasma-HDTVs/model.TH-50PZ80U
http://www.freeservicemanuals.net/user.asp?m=mariocardelli&page=4
Use these downloadable service manuals to troubleshoot your problem
SOURCE: panasonic th-50pz85u problem
My problem turned out to be silly but simple. I recently took my TV off the wall and mounted it on a stand alone platform. I snaked the power plug through the back tube and left too much tension at the entry point for power. If you leave the slightest tension the female connector will jiggle and it will shut off. It normally takes 3 minutes before you can retry and then the problem persists. Try allowing more slack and/or buying a new power connector to make sure the plug connects correctly. Good Luck!
SOURCE: Panny TH-42PZ80U Plasma TV No display on Power-up
I had this same exact issue. Panasonic sent a repair tech to my house since I was still under warranty. The tech was able to fix me up in about 10 minutes. He replaced the "brain" or A-board and now I'm back in business. This is NOT a power supply issue. The brain is the circuit board that has all the inputs attached to it (component, hdmi, etc...).
hope this helps!
Testimonial: "thanx, had a suspicion it wasnt P/S"
SOURCE: Panasonic TH-50PX60U 50 in. HDTV Plasma
Hey mate, very common in all makes of plasma TV's. See this how to video on to fix it, the video is for a hyundia but it is the same for your TV. http://www.youtube.com/watch?v=9NPobj0_GSo
It's pretty easy, just get a soldering iron and take your time, best of luck. Bro
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