hello colleague: start x see if the tuner receives the voltages of 5v and 33v ... then see the amplif, (rf) v308 and z301 if they are in good condition ... also verifies if the micro N301 recieve its power supply voltages ... pin (14-39-) 8v ... pin (54-56-61) - 3.3v .... go to the user menu and see if it is in blue option remove it and see if there is some rain ... check the tuner x inside and see if it makes good contact in the plateau the internal terminal of the antenna cable ... (they usually show up) .... put it in automatic programming and see if it memorizes the active channels ... yes not appear imajen prueva change the tuner x other q, this in good condition ... and see results ... check the scheme if the (comp), is coinsidente with your plate in reparcion ... this data are provided and when the micro is in good condition ... comment .... greetings !!