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.
SOURCE: When turning my Marshal MG250
This is likely a filter capacitor issue. The right tool to troubleshoot is an oscilloscope. This could also be a failed power amp that is driving high DC current with ripple into your speaker. This can permanently damage the speaker. Repair this before using it.
SOURCE: Marshal mg15fx : Noise when i
Mixer uses balanced outputs, this unit does not... Also ground loops can be a problem. Make sure this and the mixer are BOTH powered from the same receptacle. The next problem is that the level of the mixer is MUCH too high for an amp designed to recieve guitar signals if you are sending a mixer into this. It is NOT clear how you are connecting this to a mixer... IF you happen to be trying to send signals from this to a mixer, either use a mic OR use a Direct Input box. You should tell us exactly how you are connecting this to the mixer since there are MANY ways, and most do not make sense.
SOURCE: When I switch my Marshall
Internal failure... take in for repair. It is NOT DIY unless you are electronically adept and have necessary equipment to repair it.
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