very good days as they are repair a toshiba tv 13 "mod 13A21 n # of chassis tma511A that presents problems of reception of image, the tv works perfectly in on screen, the menus all; I changed the tuner several times I mounted of another type and nothing evaluates the stage of video and apparently works but nothing I ask if they can locate me a diagram of it and some suggestion if I am doing something wrong I would be grateful to them without adding more.