Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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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? Is this something a technical person can do or does Marshall have to get involved? Thanks, Dave

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Best thing is to open the unit and extract the fan and find the EXACT model number fan online and replace it. There are only two wires to solder., but mechanically these can be a mess to get to.

Posted on Sep 08, 2010


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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.

Sep 19, 2011 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

I have a buzzing noise through my MG50dfx every time I use the foot switch and have changed to the over dive/distorted sound. Any help would be wonderful?

Has it always done this? If it's just a mild hissing sound, chances are it's normal. If it's a loud obnoxious buzz, is your gain cranked all the way up? If it is, turn it down about half way and see if it goes away. If not, take it in to a good guitar store for service/diagnosis.

Feb 22, 2011 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

My Marshall MG 50 DFX has a noisy fan. Can I take it apart and give a shot of oil?

Bo, the fans cannot be lubricated. If the noise is from bearings, replacement is the only option.

Dec 05, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

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: 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...

1 Answer

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

Marshall MG100DFX noisy

Before you bring this into a shop, try spraying out all of the controls. Use an electronics switch cleaner that contains a lubricant. Spray into the control and work the control back and forth a number of times to loosen up any dirt inside. Then spray it again.

Let me know if that resolves the problem.


Feb 14, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

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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...

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

Jan 16, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

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