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I have this tv aswell, and yes I will confirm that it does buzz quite alot, but all plasma tvs do, it is to do with how it renders images, the buzzing can be made worse by it being close to a wall and it reflecting back. I found that my tv stand some how amplified the buzzing when i got mine. I dont think its something you can escape.
Mine i notice also when scrolling around menus seems to have lines that follow your selection....not to pleased about that
Something has shorted in the set causing the power supply to make that buzzing sound. Most likely the short is in the horizontal circuit. The horizontal makes the high voltage work which in turn lights the picture tube.
I would check to see if there are any firmware updates for your tv on Vizio's website. This usually involves downloading the update onto a usb stick and turning the tv on with the usb stick in the tv's usb port.
Before picture/sound is shown on the tv, the source and tv talk to each other over HDMI to make sure there's no piracy going on (don't you just love DRM?). If the source gets a strange response or doesn't get a response fast enough, it may assume that something illegal is going on and cut the connection to the tv.
WHEN THERE IS A BUZZING NOISE IT MEANS THAT ONE OF THE INTERNAL COMPONENT HAS FAILED .RANGING FROM A SMALL DIODE TO LARGE PARTS LIKE THE MAGNETRON OR TRANSFORMER OR CAPACITOR. IF IT IS 10 YRS,OLD YOUR BETTER OFF GETTING A NEW ONE .BECAUSE YOU COULD INVEST MONEY IN THIS ONE AND HAVE SOMETHING ELSE GO TWO DAYS FOR NOW.WITH A NEW ONE YOU ALSO END UP WITH THE NEW WARRANTY. HOPE I HELPED. KEN62 GOOD DAY!
Sounds like power supply problem, water could have caused it or it could've had a heart attack, leave it off for a few hours then retry (in case by some stroke of luck its water and hasn't caused major damage), if not, needs to be repaired by a pioneer agent. Phil
I have seen this before in a lcd tv I worked on! My problem was some bad caps (capacitors) on the power supply board. They will look bulged on the
top an may be a little leaky (brownish stain). But also check the signal board (rca s-video etc... inputs). My thought in this was a bad cap was producing a harmonic, causing the speakers to squeal! Good luck, I hope this is helpful!
Tt might be the problem with he color circuit board, bring it to the
repair shop for repair, or if you can do it do re-soldering to any
visual crack at the soldered lead terminal of the components on the
circuit board and then try put on to check if the problem goes away?