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What do you mean ?
USB is NOT a video signal at all.
Do you mean connect Hard disk or Flash Drive with video or movie to the TV ?
It appears your USB is called Wiselink.
more about it in USB Device Requirements
Just use the others. You can get a 4/5 port extension that fits into any one USB (Working Port) for a few dollars. Each port allows additional USB devices to be added onto the original single port. Assuming you have TWO active ports, that translates to 8 USB ports min. Tiger Direct has them cheap.
Very likely that one or more component capacitors have failed, unplug from electrical power, remove rear cover and inspect using a flashlight for leaking/bulging capacitors. This will require soldering experience to replace.
There are certain display symptoms, by a technician can only understand it. If you wish to know more about these screen shot symptoms, http://electronicshelponline.blogspot.com/ check this link. Pull up older posts there, either by its left side bar, or, view it in 'Timeslide' option. Fault screen shots are given.
Can buy fuses it at any Radio Shack stores.The fuse it at the end of the power supply board.That the board,where the power a/c cord plug into it.Modern electronic equipments have very small chances the fuses dies in the normal operating situation of the devices.Tv have the power supply board problems.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
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