If you sold the TV before you finished paying for it they are coming to repossess it. They ll put the account in collection and attempt to collect from you. Your credit rating will be lowered and you won t be able to get further credit or the rates will be sky-high. Do not buy things you cannot afford, especially non-essentials like a TV.
Your question is very poorly phrased but if I understand you correctly you sold a TV that doesn t belong to you...you can be charged with theft.