Question about AudioBahn A4004T Car Audio Amplifier

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Audiobahn A6004T Amp Blown PLEASE HELP!!

OK here we go I had a system installed last year and now my amp has blown. Here's what happened. I was driving my car listening to my music. I got to my destination and turned the car off. Only 15 minutes later I got back into my car and turned it on and I had no sound. I turned the car off and back on. Still nothing. I folded down the seat the look at the amps and smelt burnt wires. So I turned off all my stereo stuff and went home. I checked the fuses and both fuses were blown. So I replaced the fuses and the amp started smoking right away. (I did this before I cut the power to the amps) I took the amp out. I still have my other amp powering my subs in my car but I removed the fuses so there would no power to it while the other amp is out. I removed the case for the broken amp and saw this.....With the channel plugs and Audiobahn facing me...... on the left side there are several little black squares connected to the main board. The first 2 of these squares have 1 connector that is black. The squares have 3 connectors on the board. lined up like this - (farthest) - - (closest) Going into the board the one farthest from me on both squares are the black ones. Does anyone know what this part is? How to replace? and where I can find a new one to install? Also if there is anything else that should be replaced?

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Re: Audiobahn A6004T Amp Blown PLEASE HELP!!

I just repaired this problem... the squares are indeed, MOSFET amps. I don't know the specs of the larger ones, but the smaller ones are FQP-50N06 N-Channel 60V 50A MOSFETs, manufactured by Fairchild Semiconductor. If you search for FQP-50N06 on a site like or, you can purchase replacements for about ~60-70c each.
I just removed the board, desoldered and removed the blown amps and replaced them with the new ones, and now the amp works. Do be warned though -- after you replace the MOSFETS, you might want to check that the amp isn't drawing power while it's turned off -- when you blow the amp, you might create an internal short-circuit that will drain the battery very quickly, even if the amp isn't on.

Posted on Apr 24, 2009

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Re: Audiobahn A6004T Amp Blown PLEASE HELP!!

They are most likely a MOSFET type of transistor. If they are in the power supply part of the amp then you will probably need to replace all the MOSFET's in the power supply along with perhaps some gate control resistors for them. They each have their own resistors. It wouldn't hurt to see if the 494 IC in the power supply is working properly too. This IC is what sends the pulse width modulated square wave to the MOSFET's. Next you will want to test all the MOSFET's that are used as the audio output drivers and their predrivers and bias resistors. Don't forget to check the DC bias and offset on the outputs too, to make sure everything is OK there. In short, you will most likely need to go to a repair shop that can do all this and who would know what the heck I'm talking about. Good luck.

Posted on Mar 06, 2007

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