I'm very sorry to hear that has happened, and I apologize for any inconvenience this may have caused you. In order for me to better help you, could you please provide for me the complete model code for this device?
I hope I can get this issue fixed for you!
-- HD Tech
I received a TV from a neighbor I hook it up to cable the TV came on but then the picture left and there was a black line at the bottom of the TV and you could hear the TV. when I unhook the TV from cable then re-hook the tv back up to the TV the picture come back on I may have to do this several time but I may not have to do this again for a couple of hour'