Supersonic Portable 16" Widescreen LED TV with FM Radio

For More Info or to Buy Now: www.hsn.com/products/seo/20381...
Supersonic Portable 16" Widescreen LED TV with FM Radio
The Supersonic Portable 16" Widescreen LED TV makes it possible for you to watch TV or listen to the radio anywhere. It comes with HDMI, allowing for singlecable convenience and incredible audio video quality. The slim design keeps you focused on what's importantthe picture. The HDMI input allows you to enjoy high definition video and audio, so you can connect a true highdefinition source, such as a computer, Bluray player, or video game console. And the builtin lithium rechargeable battery and AC/DC operation keep you powered up so you can tune in, no matter where you are.
What You Get
16" Widescreen LED TV
Remote control (2 AAA alkaline batteries included)
DC car power cord
AV cables
Antenna
User guide
Manufacturer's 90day limited warranty
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Prices shown on the previously recorded video may not represent the current price. View hsn.com to view the current selling price. HSN Item #793598

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I had this television for ten months but today it started humming from speakers when plugged in but not when running on battery.
I've tried different outlets and and still the same.
I've tried factory reset, sound adjustment and radio and unplugging all ports but when using power-plug the speakers hum.
Do I need another power-plug?
If so how / where to purchase?