Question about Pioneer DEH-P4800MP CD Player
The output chip on my P4800MP is blown - everything is connected correctly, but there's no sound. I am technologically knowledgeable, but have never worked on a car stereo before, so two questions:
First, what output chip does the P4800MP use?
And second, where might I find out how to install a new output chip? Or, where might I find a hardware layout for the P4800MP?
I had the same problem with my Ford Van. I was told that I had a pre-amp built into my van and had to hook up the blue (Turn On) wire to power up the pre-amp. And Wa Laaa... I had sound and all was right with the world. Don't know if that's your problem, but it is worth investigating... Good Luck... Ed
Posted on Nov 17, 2008
Why do you think the output chip is blown? This is NOT a user serviceable part. One must posess several uncommon tools, and must know what the output chip looks like.
There IS a chance that the radio is in SELF PROTECT MODE becausea speaker in the car is causing a direct short, or even possibly VERY HIGH, or VERY LOW resistance.
One at a time Disconnect speakers while the radio has a CD or station tuned in. If you disconnect the "blown speaker" the remaining speakers left connected should start to play.
Posted on Oct 07, 2008
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Posted on Jan 02, 2017
SOURCE: Pioneer car stereo output Ic's
In most cases the problem is the electronic volume IC, ref # IC151 and part number PLM003AM (in the DEH-1600). It is a different part number and ref # in other models.
It is not always this part that causes the failure, sometimes it can be the muting transistor, a voltage regulator or even the micro on more rare occasions. It will require some troubleshooting to figure out exactly what part it needs. You will need to have an O-scope to trace down the audio signal and follow it from one pin to another. You also need a multimeter to check a few voltages in the radio. All of this must be done on a test bench with the radio powered on with a power supply. If you do not have these tools, you will not be able to figure it out for certain, you would only be taking a stab in the dark. That can get rather frustrating and even expensive buying parts that do not fix the problem.
The electronic volume IC is a flat pack surface mounted component and requires the very best soldering skills to be able to replace. It is very easy to do damage to the circuit board that can not be repaired if it is not done perfectly. If you have not replaced these type of components before, you should not even attempt this repair.
If you would like the service manual I can sell you the PDF format of it for $10. I also have the service manuals for most Pioneer products as well as Kenwoods, JVC, Panasonic, Denon, Marantz, Clarion, and more. Let me know if you would like to get it. The service manual is very helpful in repairing electronics. It contains the schematics and parts list which is vital to make sure you get the right parts and to be able to trace down any signals and to know what parts are doing wha, and to figuring out if the voltages are correct.
I hope this helps,
I hope this helps
Posted on Nov 18, 2008
Sounds like a grounded speaker, disconnect each speaker and see if the sound comes back on through the remaining speakers connected. Its sounds like it is just in protection mode from a chssis ground. I hope this helps!
Posted on Jun 03, 2009
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