Re: Blank radio display mountaineer
Almost all the 1998, 1999, 2000 Explorers with combination CD/tape player have this problem after they get some age. Its a defect in the display power supply board. There's some resistors in the display power supply that get extremely hot and almost literally fry the circuit board (ever notice how hot your CDs are when you eject them from the radio). Also, some of the solder connections will crack. Some of the power supply circuit boards can be repaired by carefully resoldering practically all the solder connections on both sides of the board. You should be able to find numerous links to performing this on the internet by searching for "Explorer radio display". When this happened to me, I found a few links that included photos and instructions for repair procedure. There was also a couple places you could order another power supply board for about $80 if you don't want to try a self repair. Same web search provided links to these too.
Resoldering the power supply doesn't work in all cases but could fix yours. However, I think the excessive heat destroys some nearby electronic components in some cases and the solder job doesn't work.
If you try the solder job and it works for you, leave the top off the radio when you reinstall it. This significantly reduces heat build up as it provides better air flow.
This was a manufacturing defect and Ford should have repaired/replaced all these radios. Since it wasn't a safety issue, guess they figured it wasn't necessary.