One use for the USB inputs on flat screens is to allow you to connect a USB stick or external hard drive and watch or view any external files you have.
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Sounds to me like something else is causing those parts to fail. It should be under warranty but depends on the repair shop. Why not just buy a new one.
Settings usually with a good USB cable, the settings on your TV when doing input go to USB where pictures and cable will show and connect from your computer to the back of TV and if doesn't work call TV company they always know the hook to this.
Very bad symptom indeed.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations.
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. https://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. //
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