pioneer DEH-P770MP

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=82696
Printed Date: May 13, 2025 at 6:04 AM

Topic: pioneer DEH-P770MP

Posted By: chinkst3r
Subject: pioneer DEH-P770MP
Date Posted: September 10, 2006 at 3:02 PM

my pionneer head unit went out a long time ago, and i never figured out why, i simply replaced it with an old one, but i looked at it the other day and saw that the fuse was blown so i replaced it and it keeps blowing everytime. i brought it back into the house and i have a dc power supply for my room, so i hooked it up to that, when it has a bad connection it makes a weird noise, and so it did. i think it has a short in it somewhere but i dont know where to begin, i would love to get this thing working again cause i hav another car that doesnt have a HU. any suggestions?

Replies:

Posted By: i am an idiot
Date Posted: September 21, 2006 at 8:33 PM

You have 2 possible problems either the radio was at one time hooked up backwards and this shorted the reverse polarity protection diode which is located very near the power input plug.

Or more than likely the output Chip is shorted It is located rear dead center of the heat sink at rear of radio

the part is available here https://www.pacparts.com/electronics/model.cfm?mfg=PIONEER&model_id=DEHP7700MP&back=0&action=list_part&Cfid=667209&CFTOKEN=41757620

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Posted By: i am an idiot
Date Posted: September 21, 2006 at 8:37 PM

Sorry forgot the part number PAL007 or PAL006