Question about Pioneer DEH-P840MP CD Player

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Pioneer DEH-PB40MP No Power

Hi, I have had this deck in my Truck for about 6 months with no problems. Problem now is no power,no Display. (unit usually powered up and opened the front panel if I left it that way. There is power to the plugin (yellow wire)and a good ground (Black Wire) I also made sure I plugged in the antenna each time I checked for power up. I tried wiggling the plug. Still nothing. Popped the display panel off and cleaned the contacts, nothing. I also tried pushing in the pin **** button in the front of the display panel. (I was told this might be a restet button) I have no manual or warranty for this. Is there an internal fuse on these that I can replace or have replaced? I first noticed it did not power up when I started the truck one day. I always turn on some music first thing. It did not smoke or "pop" or anything, just no power. Please Help, Paul

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Have u checked the trucks electric fuses in the fusebox ?check for ACCESSORIES fuses.
then go for any further experimentation.
as for the RESET BUTTON,use it after your stereo comes to life .
i do hope this solution helps

Posted on Jul 08, 2008

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Hey, indeed this sounds like a couple of fuses gone bad. I dont know this accurate model, but it shouldnt work any diffrent. Anyway, with the stereo UNPLUGGED remove the covers and inspect inside, especially in the vicinity of the power transformer. The fuses may be glass cylinders with metal caps. There are other types, but the only ones you should probably try to mess with are the glass type, usually about 5/8" long by 1/8" wide. They should ONLY be replaced with the same type. Somewhere on the cap will read something like 3A, 4A, etc. This is the ampere rating. Replace only with same rating. It is foolish and dangerous to just go out and grab whatever fuse is laying in your car's glove-box, for example. There may be a couple fuses. As I said, there are other types of fusible devices, but they would require a tester and some limited knowledge of electronics to test. The glass-bodied fuses can usually be seen to be either good or bad by looking at the filament inside.

Posted on Mar 21, 2006

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