Question about Alpine PDX-2.150 150W x 2 Car Amplifier Car Audio Amplifier

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Hi.i've got Alpine PDX-2.150 Car Amplifier and one day it blow the fuse's.i checked and it was blown MOSFET's (all 4) replaced them ,now amplifier's blue lights turn on but MOSFET's heat rising very quickly,overheating, and you can hear little ticking noise from the power transformator.any ideas how to fix it?thank you.

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  • mindeeez Oct 14, 2010

    what is the IC? thank's

  • mindeeez Oct 14, 2010

    didn't expected that,but true IS true.thanks for your answer.

  • mindeeez Oct 15, 2010

    hi.i just replaced IC and all MOSFET's ,checked END transistors and other transistors,diodes,nearly everything and it looks ok.no shorts anywhere.no damage on board tracks.but problem is still the same.mosfets overheating.how can i start trouleshoot? what to look for or where to look for and how? please heeeeelp:) thank you for your previous answer.

  • mindeeez Oct 15, 2010

    i think that would help,but it's too difficult for me...any simplier ideas what i can check using tester? or where to get an info or where i can try to learn how to fix car amplifiers.find a burnt or shorted part is very simple,but testing amps with audio generator or something similar it's to complicated...but thank you once again for your patience.

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The mosfets heat up very quickly because they are uncommanded so they are fully open, putting a huge stress on the transformer. The little ticking is the autoprotection of the source trying to kick in.
The entire amplifier has been fried - you will have to replace all the preamplifying IC's and the driver transistors (the ones that command the mosfets). After that you will have to check the board itself for heat damage - burns, bad solderings, damaged resistors and capacitors.

Posted on Oct 14, 2010

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  • Azrael SRL Oct 14, 2010

    IC = Integrated Circuit

  • Azrael SRL Oct 15, 2010

    Inn that case the signal doesn't reaches the finals. Use an audio generator - set it at 1kHz - at the input of the amplifier (make sure the output voltage of the generator is set to no more than 2 volts) and then using an good voltmeter - one that can measure peak values in the audio frequencies range - check where the signal stops, there you will find the failed part.
    Of course test that using a standard load - a good pair or 4 ohms speakers that are capable of handling the power will do in a pinch.
    While you are there make sure the speakers in your car are in good order.

  • Azrael SRL Oct 15, 2010

    Without at least a good voltmeter you can't do very much- check the voltages with and without a signal present , if they don't change then the part in question doesn't receive the signal - start from the speakers output.

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