Question about MTX Thunder 4250D Car Audio Amplifier

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Mtx amp thunder 4250d blow the fuses

I check the fets and I think they are in short but I can`t find the fet, the number is FB42N20D and MUR1620C and 75339P,
can somebody help me to find them?

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  • MARIO Feb 17, 2009

    thank you pbabin. you are right the MUR1620C appear be in good condition, but the 75339p apper be in short I thing this is why the fuses blow up, when I install the new mosfet 75339p I will can recheck the amplifier and I will add a comment about this, and another thing this problem is common in this amplifier?

  • MARIO Feb 23, 2009

    thank pbabin for your information I fund it very useful.

  • Perry Babin May 11, 2010

    If the amp blows fuses only after the remote voltage is applied, the problem is generally shorted output transistors (IRFB42N20D in this amp?). Shorted outputs can cause the power supply FETs (75339s) to fail. Before you power it up, read through the following page (or at least the information in the yellow box).

    Amplifier Repair Primer

  • Perry Babin May 11, 2010

    http://octopart.com/search?q=IRFB42N20D



    http://octopart.com/search?q=huf75339p



    The MUR1620 rectifier isn't likely to be defective.



    email me if you need help.

    babin_perry@yahoo.com

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Professor_V
  • 81 Answers

SOURCE: i need 2 chips for an mtx roadthunder 4250d amp

HUF75339P3-ND

THE ABOVE LINK WILL TAKE YOU TO THE DIGIKEY PAGE THAT HAS YOUR MOSFETS YOU ARE LOOKING FOR IN THIS AMPLIFIER. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE....V

Posted on Jan 06, 2010

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HUF75339P3-ND

THE ABOVE LINK WILL TAKE YOU TO THE DIGIKEY PAGE THAT HAS YOUR MOSFETS YOU ARE LOOKING FOR IN THIS AMPLIFIER. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE....V

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