If your other WiFi devices are still connecting, the first thing I would try is power cycling the HughesNet modem, as in unplugging it, waiting at least a minute, plugging it back in, then waiting two or three minutes for it to be fully back up and ready before attempting to connect the TV. If that doesn't help, the problem may lie with the TV itself. I'd try having the TV 'forget' all WiFi connections, if it has any shown. If that doesn't help, I'd try resetting the TV, as in a factory reset. If even that doesn't help, the next step would probably be contacting the TV's manufacturer, or even going on their support community, which most TV manufacturers have, and asking for help there, as they may have good advice on things to try.
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