I had that problem on my 2010 Explorer sport trac adrenalin. Could not see any of the display lights on the radio, station, song to set up a phone or bluetooth music etc. Was totally black. Found a video on you tube (there are tons, find the one the explorer radio and removal) and followed advice about bad solder joints on radio. Ordered dashboard removal tools from Napa to remove centre dashboard console, removed radio, took it into my kitchen, re soldered the connections on the back of my radio. First tested soldering on a junk car radio I picked up, to master my technique. Now it works like a charm. All lights function like new. Took about a hour of removal, half an hour of soldering, then re assembling.