Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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I have a Marshall MG50DFX. It's about 2 years old. I took it out on a gig and it quit working. The fan still works, but no sound. This amp is practically brand new. I am very diassappointed with the MG50DFX. Can somebody help?

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  • cthorne13 Jan 21, 2009

    I have not have the opportunity to actually try your solution, but I will eventually. In the meantime, I have gone back to an old amp setup that has worked for 27 years....old solid state Yamaha amps. If I'm able to repair the MG50DFX, I believe I will end up selling or trading it.

  • traceyclaire May 17, 2009

    no sound but lights come on and fan works

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Hi a couple of years back I had a similar problem. Remove the chassis, you will see a wire (might be blue) it is quite noticeable (looks like a jumper a few inches long). It controls channel switching. Check it for dry solder or broken at either end. Good luck, Dereeldeel

Posted on Jan 18, 2009

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3 Answers

Fan will only start when you blow into it, and when it does start, it's noisy. Where do I get a Marshall replacement fan off the newer Marshall amps? These fans are said to be better than the ones...


Bearings have gone in it... The fans are standard part. Take number off the label and search for the same unit. Note if it has two or three wires. If it has only two wires, replace with one of same voltage and current or wattage rating and of course that fits size-wise. Three wire ones have a sensor and you are best to replace with exact unit.

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I have a MG50DFX and a MG15DFX, both amps head phone inputs don't work anymore. When plug in the headphone the speaker won't silence.


This is likely a bad switch contact in the headphone jack... they are really poor quality in most amps... plastic case and EASILY damaged by side forces on the jack. REplacement is the solution.

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Hello, I have a Marshall MG50DFX and the fan is making a lot of noise. I saw a post from crispy_tophe and I'm looking for info. on where can I get the fan and what is the procedure to remove/replace it?...


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Sep 08, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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When I turn the amp on it makes a loud squealing noise. If I turn it on and off again (several times) the amp will work normal. It doesn't do this all the time; but it is beginning to happen often. When it...


Have a look at this link:http://www.geofex.com/ampdbug/squeal.htm then Back to the Home Page. You may have a bad solder joint some place on the circuit board also. Unless you have experience with electronic repairs you are best served by consulting an accredited Marshall dealer and repair person as there are voltages present that can kill or injure you.

Aug 22, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

No sound being put out


A VERY common problem working on amps is to miss putting a cable on. Sometimes a small cable "hides" and we forget to put it back on OR it has gotten pulled off and we didn't notice... AND sometimes theyhave wires going through a hole in the cabinet to connect to a speaker and the wires get pulled a little and pull off the speaker where we can't see them... what a pain... these things aren't made for easy service.

When handling the chassis to assemble it is EASIER to lay the cabinet on its side to control the heavy amp.

May 17, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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I have a Marshall guitar amplifier model MG50DFX, and with the volume and gain controls up all the way,there is very little volume.Is it the audio output IC?


I have the same problem. It would appear that this particular series of Marshall amps have a "bug" in them. There are at least 10 other MG50DFX owners, some here at Fixya, others at Harmony Central that have the same problem. Check out the other replies to this problem here at Fixya. I'm gonna try spraying the jacks and pots with a good cleaner. Then, I'm gonna try inserting a patch cable between the FX in and out. This seems to produce sound according to the other replies here at Fixya. Although this may not fix your amp, or mine, for that matter...I'm gonna try everything I can before I have to send it off for repairs.

Oct 11, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

Marshall mg50dfx was working great


please check the speaker leads in the back near the edge of the driver (the heavy metal part I think theres 2 in that cabinet )

May 17, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

Mg 50dx no sound


Contact Marshall on the web or try a search for exactly what you need, most companies will help you with there products no matter how old they are .

Mar 01, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

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