Question about Marshall Amplification Marshall MG15CD 2-Channel 15-Watt Guitar Amp

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Marshall mg15cd not producing sound via input

When turned on, it has sort of a buzzing sound. it isn't picking up anything plugged in through the input

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Posted on Aug 16, 2011

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The amp does not work at all even though the lights on the amp come on but when i connect it to the guitar no sound whatsoevva i checked the sound nobs on the guitar and the amp n all r ok but no soun


Have you checked a different cable?. Also, when you plug in the unit, there should be a "pop" if everything is turned on. If there isn't, the connection is bad someplace.

Aug 06, 2012 | Marshall Amplification Marshall MG15FX...

1 Answer

Marshall valvestate 2000 avt no effects


If just no effects, look for a loose ribbon wire. Check footswitch and make sure the plug and jack are fully mated.

It is possible you have a defective 4558 IC, about the only way to locate the problem IC or transistor quickly is to "buzz test" the circuit. You may need to have an audio input of some sort pugged in as well to get the effects to respond. Expose the bottom of the chassis, and with a screwdriver begining at the output, work your way back through the stages/ICs until you lose the signal. Since you seem to indicate it is at the effects, begiin where they end.

Also make sure the solder connections are sound.

Pin 3 and pin 5 are the positive/noninverting inputs to the 4558 series of IC.

Jan 27, 2012 | Music

2 Answers

Low volume on my marshall


I am very new here and don't know how to answer a question to a specific problem so I will write about the most common problems that I have had over the decades doing guitar amp repairs. If you find that your amp is extremely low in volume and then suddenly comes back to normal- check out the effects return [or power amp in] jack. Especially in Marshall amps-these corrode and your signal dies. If there is loud noise such as hissing and crackling with no guitar patch cord in the input jack- the input jack is likely at fault. They normally have switching contacts that ground part of the input circuit when the 1/4 inch male plug is disconnected. When this in is corroded or too weak to make normal contact, you can get these symptoms. If your amp is a solid state Marshall or Fender and there is a random buzzing sound with no guitar signal connected- hit the side of the amp and listen for the buzz to go away or become louder-if it does, this usually means that the connections are loose at the two large filter capacitors. In one or more Marshall amps, they use a filter circuit in the low voltage power supple for the preamp tubes. If you encounter a dead Marshall[the model escapes me now] remove the circuit board and resolder the four connections at the bottom of the bridge rectifier. If you have any other amplifier repair questions you can email me direct at computerlen@hotmail.com.

Nov 14, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

3 Answers

I got a Marshall MG100HFX Amplifier for guitar. The problem is that whenever i turn treble switch on it gives clean sound as it should, but in couple seconds it fades away. When I turn the switch again it...


I haven't played or worked on a MG100HFX but I understand amp circuits very well. The behavior you are describing sounds to me like a bad capacitor in the Treble circuit. This is a problem that would require the skills of an experienced amp tech. If you are within your warranty period you might want to return it. If not, a good local repair shop should be able to diagnose the problem.

Good luck and keep rockin'!

Mar 01, 2011 | Marshall Amplification Marshall MG100HFX...

1 Answer

Constant buzz. even with no guitar plugged in


This usually indicates that your neutral and live are backwards. Try plugging the unit into a different outlet elsewhere (different room)
If it still is buzzing, look for a GOUND LIFT switch in the back, it may have inadvertantly gotten flipped to the wrong position.

Feb 27, 2011 | Marshall Amplification Marshall MG50FX 50...

2 Answers

Its a marshal 8080 valvestate 80 v and it buzzes and some of the knobs crackle when turned,


Buzzing could be normal for this amp, especially if you have the gain cranked way up (or the volume way up) see if the buzz goes away when you turn the gain/volume down. If not, there is a problem that needs to be properly diagnosed by the amp tech at your local music store. The crackling is also unfortunately rather normal for an amp that's a little older. Oxidation builds up inside the knobs and makes that noise as you turn them. If it only happens when you change settings I wouldn't worry about it, but if it gets bad, a tech guy can clean it out for you.

Feb 20, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Hi There, i have a Marshall MG100 DFX Series Guitar Combo Amp,and when i plug my guitar in i get verry little,or no sound from the guitar imput,can you please help. Thank you.


Try exceriszing the connections for input and headphone jacks ( just be inserting qtr inch connector in/out of jack ) a few times. then plug back into your input. if that didn't solve anything while amp is on move the input jack around ( up, down, left, right, ) and see if this makes the signal cut in/out to normal playing. if so you just have broken solder connections on the jack. Also you may just want to test your Speaker to make sure no problems exise there. ( Voltmeter across + and - terminals ) prolly 8 ohms but will most likely state on woofer. if not of this fixes your problem let me know and i'll throw some more steps your way.

Jan 24, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

I have a Marshall MG100DFX. I turned my amp on a few days ago and I heard this loud sound (not the standard hum/buzz that you hear when you plug a guitar into an amp; it sounded more like a foghorn). Now,...


I would try hitting the side of the amp before turning it on. There may be a loose piece of solder or other conductive particle stuck somewhere. Bang the cabinet rather hard with your fist. If that doesn't help it might be a loose solder connection at a resistor or capacitor but a tech should check that out.

Dec 04, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

3 Answers

Marshall mg100hdfx loud fuzz and distortion and no guitar sound


Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.

Jun 25, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

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