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I have a mtx thunder 7801 series amplifier well i got a stereo from someone and i didnt know it a the time but it had the wrong plug in the back of it so when i hooked my amp up to it what i thought was the remote wire wasnt and as soon as i hit the power button on the stereo if fried the fetts from the circuit board to the heatsink can this be fixed

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The short answer is probably yes... easily, probably no. If you are lucky and only have one or two shorted transistors, then you can cut the leads on those and see if it powers up without blowing a fuse. Also check for shorted diodes and burnt resistors. If all FETs (or most of) the FETs mounted to the heat sink are shorted then it is probably not worth taking the chance putting the time and money into fixing it, just to have it smoke again. Also they are likely in parallel so it is a little more difficult to determine the bad one as they may not all be bad. Measure with an ohmmeter and find the one with the lowest resistance and remove that first and keep going until you believe you have gotten them all. Normally repairs like this are not for someone with little or no experience on amp repair, but if you feel like taking it on, good luck!

Posted on Apr 20, 2014

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Posted on Jan 02, 2017

  • 113 Answers

SOURCE: my 7801 doesnt turn on

check pwm circuit amps turn on with 3-4 volts on mosfet gates ic 494, 5252or 555 controll these.hit me up for more

Posted on Aug 09, 2007

  • 31 Answers

SOURCE: i need help hooking this up

"is the got two wires in the ground and remote turn on wie"
Can you be more specific about the wiring...where the two wires are connected to and where they come from, and I'll try to help you.

Posted on Mar 30, 2008

kcarmax
  • 30 Answers

SOURCE: i have a mtx thunder 7801 and a sledge hammer box

Sounds like the subs are blown with the voicecoils fused together which means the amp is/was seeing a dead short ( zero Ohms reisitence) not good for any amp. Disconnect the speaker terminals from the amp and see if it turns on. The funny smell might have been the subs blowing up, i'll keep my fingers crossed for you.

Posted on Mar 01, 2010

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