20 Most Recent Marshall Amplification Marshall MG15 15 Watt Combo Music Instrument Amp Questions & Answers

Hi, I have repaired loads of these kinds of amps. The first thing to check is if the input jack socket is still soldered to the circuit board properly. These have a tendency to break.
They all have a dual opamp and a 15 watt power amp chip. Invariably it is the power amp chip that fails IF it is an electronic fault. Both chips can be bought for a few pounds.
The variations, aux input, spring reverb and this, digital effects are extremely unlikely to cause this kind of failure.
At one time anyone with a screwdriver and a soldering iron could fix these, but in the days of health and safety, find someone who knows what they are doing.
It should take half an hour and about £3 worth of bits.
All the best, Chris the Fader.

Marshall... | Answered on Sep 30, 2015

I would test by first trying a different guitar cord. If the fault is still there, try jumpering the effects in and out jacks with a patch cord. If there is sound now, clean the two jacks with contact spray and working a 1/4 inch plug in and out of the two jacks.

Marshall... | Answered on Dec 07, 2014

Internal failure... take in for repair. It is NOT DIY unless you are electronically adept and have necessary equipment to repair it.

Marshall... | Answered on Nov 23, 2014

Make sure you are using this on a three wire grounded receptacle. If you are on an old two wirepower system, have a ground installed in the receptaclel you are using. If you are on a grounded circuit, then exercise your warranty for repair/replacement.

Marshall... | Answered on Aug 17, 2011

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Marshall... | Answered on Aug 16, 2011

It sounds like you bought a defected amp. You should contact Marshall and tell them the problem. You should have some kind of warranty.

Marshall... | Answered on Apr 05, 2011

Open the unit and restore the jack to the proper place. Do NOT overtighten the input jack mounting nut.

Marshall... | Answered on Feb 01, 2011


Marshall... | Answered on Jan 17, 2019

Make sure speaker cable works and is connected then check fuses. If it has a master volume, make sure it's turned up.

Marshall... | Answered on Jan 08, 2018

Most likely cause for this is an intermittent potentiometer. Check to see if any of them are mechanically loose as this is a sign that they have been damaged and could have cracked the wiper surface inside the pot causing this problem. Alternatively, any switch that controls any gain setting could also be intermittent or dirty. Gain of the amplifier should be stable, but is controlled by the feedback and signal injection at the pots so that is where to look first. Good luck, as intermittent problems are tricky, but sometimes better than no function at all which can be more costly.

Marshall... | Answered on Nov 21, 2017

Hi. Doesn't look like it as the speaker is a 4 ohm one and the head needs at least 8 ohm as far as I can see.

Marshall... | Answered on Aug 08, 2016

What type of Marshall, please?
First of all, control the fuse and let me know.

Marshall... | Answered on Dec 26, 2015

Does anything happen while you turn the knobs on the amp?

I had a similar problem with a yamaha amp. It turned out a couple of knobs went bad. Soldered new pots and it works fine for me now.

Marshall... | Answered on Mar 29, 2015

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