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I have both a Marshall mg15dfx and a mg15cfx. The problem is the effects will not turn off both amps seem to have all effects running at once. Both amps developed this problem around the time the warranty ran out.

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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.

Apr 08, 2014 | Music

1 Answer

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...

1 Answer

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...

1 Answer

No output from my Marshall MG15DFX

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

Feb 04, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

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

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...

1 Answer

Input clean is very low almost not there. switching to OD works fine.

If memory serves me correctly, these units use a 4558 OpAmp Ic. Both inputs pass thru this IC. One side provides a clean amp stage and the other is set up to run in a higher gain mode. This IC needs to be changed, It should be a small IC with 8 pins.


Mar 06, 2009 | Marshall Mg15dfx 15-Watt Combo Guitar...

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