Question about Marshall Mg15dfx 15-Watt Combo Guitar Amplifier

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No output from my Marshall MG15DFX

Basically there is no output from my Marshall MG15DFX amp. It is probably a litle over 2 years old but has only been used a handfull of times.

It was working correctly last time it was used but on trying to last week I found that it had no output. When headphones are plugged and the volume is turned up full you can hear the sound faintly.

Thanks for your assistance.

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  • brendanmerch Aug 05, 2010

    I had the same problem. Open it up and check that the line out jacks are closing properly when there is jack plugged in.



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  • 88 Answers

Could be effects module or sound output i.c. also check send and return jacks

Posted on Feb 04, 2010


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Marshall amp

Marshall are very good amp. but when it gets faulty its a headache. kindly get a technician and check the amp part or anr dry joint from the capacitors due to vibration and age.

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Marshall MG15DFX - Sound cuts out randomly when using distortion or effects. Turning amp off then on solves it only until it happens again. Does not seem to affect the clean channel. Could it possibly be...

There are many things it could be... I often quote the probabilities based on many ears experience and the symptoms the person posts.

Based on what you have posted, there is an intermittent... the unit vibrates while operating... there could be a loose connection, however my guess is you will find bad soldering at one of the pots that control the distortion. The solder often breaks loose as the sometimes support the circuit board from the leads of these pots. Also switches that solder to the board and sometimes jacks for foot switches break loose.

Open the unit and inspect the solder joints. It often takes an experienced eye to spot the tiny grey ring around the solder meniscus that signals a failure.

Mar 11, 2011 | Marshall Mg15dfx 15-Watt Combo Guitar...

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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.

Nov 29, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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Basically, I turned it on, played it, turned if off, went back to play it and I got a humming noise then it went dead!!??

I suspect either the power supply rectifier developed a short which would likely blow a fuse till repaired OR the power amplifier chio went bad. Most of the smaller amps use some version of the TDA2050 audio amp chip. It looks like a power tab transistor (TO220 stylle case) with 7 leads.

If it went, it did so for a reason... time for unit to be serviced.

May 26, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

Where is the serial number on my marshall amp mg15fx

Behind the amp, right around where the power-supply is. Usually the right hand side at back of amp. Serial numbers are labeled as: S/N########

Mar 14, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

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I have a problem with the digital fx section on the amp. No single effect works anymore, even when the fx level is on maximum..

probably a bad solder joint on the circuit board where that pot is soldered in. check it out and reheat and apply a little more solder. or its just a dead pot.

Jan 18, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

Input jack replacement

oh yes it can be fixed quite easily,...but you are best to bring it down to your local music store and have them do it, they'll be fair in price and your amp will be done right,....(no time for that breakin down stuff when your playin your guitar), thanks, cracklin joe

Jan 07, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

Ive had this amp for a year now but it has a big problem if i turn the amp on there is no sound at all even if i crank it all of the way up when its all the way up i here a slight buzz like feed back can...

Try checking the preamp out which would be located at your line out plug. Plug that into another amp or get a 1/4 inch to RCA splitter and plug it into your home stereo. By doing this you can eliminate the preamp circuitry. That would point to the power amp. Let me know what you find. Good luck.

Dec 27, 2009 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

Mg15dfx Amp issue

Most of these use an amplifier chip in the TDA family of 5 or 7 pin audio amps.

If you play real loud you may overheat the chip and it will go into shutdown to protect the chip.

Sometimes htey don't put adequate thermal conductive grease on the chip causing it to overheat.

Remember this is a small practice amp, not a powerhouse.

It sounds like it is going into "motorboating" as it is called.

Dec 11, 2009 | Marshall Mg15dfx 15-Watt Combo Guitar...

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