Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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I left my amp on allnight one night, now I have intermittent power. I put a multimeter on the switch and it reads good.

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A lot of the newer Marshalls have circuit boards with bad solder joints. If your amp is one of these and heated up enough sitting there that could be your problem. In any case I would recommend having it serviced. There are sources on the internet for the schematic but unless you have electronics troubleshooting experience and the proper tools you are better off taking it to be serviced. If it is still under warrantee it shouldn't cost you very much.

Posted on Oct 20, 2010

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These had a little switch on the far right side that shifted modes from stereo to main and monitor. Check the position as it is tiny push button. Also try sending line levels DIRECTELY into the power amp inpout jacks to verify the amps are both OK... if not, the repair shop is only option... there is only one main fuse for the amp and if one side is working, then the fuse is good.

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My amp will turn on and even when I have the guitar and amp connected no sound comes from the amp. I don't know what to try to fix it, so I have left it alone, testing it every once in a while (it...

Possibly a loose connection, or bad solder connection. unplug it from power.

If you think you are up to it geta soldering iron and some solder, and a screwdriver, and take the amp part out. be careful of the speaker wires. put some tape on each one and label them so you know where to put them back. after you got it out you might have to take some more screws out to get the board off of the chasis, so you can see under it. this is where all the components are soldered to the board. maybe use a magnifying glass. touch up anything that looks questionable.
do all over. you don't need to know what everything does if you just go all over. careful not to cause any shorts. you might see something that obviously needs to be fixed. you have found a problem. you can't fix something if you don't find a problem. do all over anyway if you think you still have to.

Put it back well enough to test it. then put it all the way back together, or continue to look for a problem, or take it to someone, like me!

Good luck


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I have a Behringer EPX 2000 amp. The limit lights are lit up and the amp isn't powering up properly. There is a bad burnt smell to the amp and sub so i'm pretty sure something has blown. The limiter switch...

The limiter probably delayed the eventual damage. Nothing prevents all damage absolutely.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech for forensics and further action.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

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Hi i have a kam 1600watt amplifier and for some reason the clip light just came on and won't go off it's a strange one as the amp is a back up and i just turned it on one night and it came up like this...

Using a multimeter VERIFY the amp is not putting out a DC bias into your speakers. If it is it may cause damage to the speakers. I would not TOLERATE a bias in excess of 100 millivolts.

If you leave the input float... ESPECIALLY with no speaker loads attached, the amp may be internally feedbacking... DO NOT permit this to continue!... ALWAYS have your speaker loads SECURE and inputs attached, especially in tehse high pwer amps.

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1 Answer

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I will assume by"no power" you mean NOTHING is working, The likely cause is a failure in the power amp chip or the rectifier filter. Each of these would LIKELY blow the internal fuse. Using multimeter or a a voltmeter you can isolate the cause. You should find plus and minus voltage from the rectifier across the filter caps. probably at least 20 top 30 volts minimum.

If you mean the amp just doesn't generate enough noise, it likely is doing the best it can. This is a small amp and ypou can't expect to compete with 100 wat to 200 Watt amps. The speaker is too small to do that for one. This amp is good for practice.

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