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Possible that the noise can be associated with a faulty frequency in the switch mode power supply. So if you see a blurred or warbled picture then check the main capacitor in the power supply as it can be faulty and so produce the A/C ripples in he power so that the SMPS works with a difference.
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You can try a hard reset: Unplug TV from AC mains and remove all cables from TV.
Wait about 30 minutes and replug to AC power and redo the cabling. Switch on
the TV and see if it works..
Ur tv now power on only have picture few mins,than dead,have sound only?Yes,than the 1 or 2 the long board call the LCD inverter boards are dead.The LCD inverter long boards help the LCD screen to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy 1 or 2 long LCD inverter boards for the replacement.
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.
I would look for intermitent solder connections on the small horizonal driver transformer as well as other HV Componets.(HV Transformer etc.) Also solder up the Vetical output IC. These have been common causes of failures. I would not use the set until these have been checked and soldered. If you don't, a massive failure of the hoizonal circuit and powersupply will occur.
Hope this helps,
Sounds like the audio amplifier circuit is bad. I do not know if where that is in that TV. If you were to hook a boom box or stereo receiver to the TV (via the audio out jacks on the TV), you could monitor the sound that way. If you get clean sound, then the problem is in the amplification circuitry. If you still get humming, etc., then the problem is further upstream.
Also, clarifying... the picture has not changed one iota, correct?
Sounds as though there is an intermitant, heat-related problem with the HV transformer. You can order this at a tv parts shop or from Sony (probably more expensive) the part number should be on the part or on a schematic. If not, the parts dealer can look it up from the model number.