In order to  sell anything you must show a value to a customers. What you need to do is to find a repair orders from your store . Or You go to the repair shops tell them you need an estimate for instance..That you have a samsung 7000 or 8000 what ever it might be, that you your Pixels are burned out..How much would it cost to repair something like that ? Do some research ,,I know for fact that some manufactures only cover certain components. You gotta show...