. Incorrect or loose connections may cause color problems or a blank screen.  The problem Try this! The color is poor or the picture is not bright enough. There is a dotted line on the edge of the screen. The picture is black and white. If the test picture does not appear or there is noise or distortion, the TV may have a problem. Contact Samsung's Call Center for assistance. If the test picture is displayed properly, there may be a problem with an external device. Please check the connections