Question about Marshall MG100HDFX 100-Watt Amplifier Head

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The fuses on my marshall amp kept blowing so i took out the output assembly and it worked, but there is no sound. the output chip was burned. Where can i get a new Output Module Assembly For Marshall MG100DFX Amp.

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  • Marshall Master
  • 5,603 Answers

If the output module has a TDA7293 chip/stick on it, replace it. Use thermal compound like they did and observe any insulating washers used. Clean board and check for shorts after replacing.

Get them at about $6:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=497-2170-5-ND

and

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=497-8865-5-ND

Depending on how the leads are bent... first one leads go down (V suffix), second they are bent horizontally(HS suffix).

Posted on Apr 05, 2011

Testimonial: "Ok im taking out the tda chip but its hard wired into the board how do i get that out?"

  • iiTheKidii Jul 13, 2011

    i also needed the whole output assembly on my MG100HDFX. found one here for around $34.
    http://www.amprepairparts.com/outputmodu...

    hope this helps.

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Why does fuse blow when unit is powered up


I rather suspect IC1 TDA7293 is the cause of your problem. If this is the case you will need to check the speaker/s

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According to the schematic, once the signal is initially amplified (also where the LED shows signal), the audio is sent to the send/return jacks (shown on pg3-C7). A quick test to see if audio exists at the insert point will require an insert cable. An insert cable can be a balanced 1/4" cable which splits out to two mono 1/4" connectors or a pair of RCA's. Connect one of the insert outputs to a console (if 1/4" cable) or a tape loop on a home stereo receiver (if send cable splits out to RCA's) and see if you've got sound when playing your guitar (with LED on the Marshall showing signal). If no sound, go to (A) below. If you have sound, go to (B) below.
(A) Ten pin connector labelled CON2 (shown on pg5-B1). Make sure connector is tightly seated and that the pins on the jack and the female connectors in the plug are clean and that good contact is being made.
(B) Twelve pin connector labelled CON1 (shown on pg5-B4). This is the DFX board - make sure this is tight and well seated.

According to the schematic there are voltages seen at several of the connection points previously mentioned. If you have a multimeter and are qualified and careful - check to make sure the voltages are present as shown.

If you're not qualified - meaning you have little or no experience - STOP and refer this repair to a qualified bench tech. They get paid to keep the magic smoke inside the amplifier. You may end up damaging things worse or even beyond repair or even damaging yourself.

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My Marshall AVT150H has low output.


How do the pots sound? any stactic on the volume pots ? may need replacing or cleaning them if so . I would also consider replacing the tube

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Why my Marshall amplifier immediately blows fuses?


It could be a failed power supply capacitor, it could be a shorted speaker, it could be a shorted cable. It might also be a conductive piece of trash in just the wrong spot on the circuit. They would be the big ones of about 5000 microfarad give or take a few hundred microfarads.

Though a little less likely, there could be a short of failed component in the output stage.of the amp.

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I got a Marshall MG100HDFX for free from a friend stating it was blown. I asked how this happened and he said that one of his friends plugged in another speaker or amp into the second speaker input in the...


The power amp section has blown parts. You will likely find they use a chip like the TDA7293 as the power amp output and it will be blown, shorted causing the fuse to blow. These cost $6 from Digikey.com. Find a competent tech to replace it and use heat sink compound. Verify the part before ordering one. They come with leads bent either way so make sure you get the one with a matching suffix letter. When firing up after repair, put a 60 watt light bulb in series with the hot power lead to act as a current limiter... saves blowing fuses if there is another problem.

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I have the Marshall MG100HDFX 100-Watt Amplifier Head, the fuse was blown and there is no audio coming out of the the spkr jacks. this is how i received the amp and have no further info to diagnose. im...


If the output transistors have shorted, it is LIKELY that several others in the drivers and even farther back have also gone. HOWEVER some Marshall amps use one or more TDA7293 chips. These require installation using heat sink compound. The TDA7293 can be found at:

http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=tda7293

They come in two sexes depending on which way the leads are bent for installation. You have to see how yours are mounted relative to the circuit board. Cost about $6.

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1 Answer

I run a pod HD 500 into the amp and It breaks up, like there is a blown speaker sometimes.


The Marshall is a super clean acoustic amp.

The POD is overloading the amp.

Try the electric guitar input and keep the gain on the amp down, keep the EQ level and use the POD and the end volume to adjust the final volume.

The normal inputs is for a low output acoustic pickup - the POD is a high output electronic source.

Start with the Marshall gains low and get the clean sound good, then work on the gritty sound.

The amp is voiced for a sweet clean sound - if you want grit'n'ball change to a 50w Marshall valve head and a 4 X 12 cabinet.

Horses for courses

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If you connected both speaker outputs of the two heads together you likely destroyed the output transistors of one or both heads. assuming they are solid state. It is unlikely a tube amp would have much damage.

The sequence would be that when you started driving the second unit, the feedback paths within it would fight the attempt to drive backwards and the output transistors would first overheat and then short, This would put a shoirt on the power supply and blow the fuse. The damage would be permanent and would LIKELY NOT include the transformer.

Expect the power transistors, driver transistors, associated resistors to go up in smoke. The unit will have to go to a shop to repair. Probably $30 of parts wholesale, but labor is going to cost you for sure. Expensive mistake.
Refurbing this has to be done carefully to insure all bad parts are replaced as a single bad one left in can blow the whole lot again.

The new Speakon connections avoid some of these mistakes... but not all.

Operate ALL you equipment from a single point source of power to avoid ground loop and faults from causing "common mode" destruction of circuitry.

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1 Answer

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The problem is not likely to be the fan. I would suspect the output section of the amp to have a problem. These units use a 15 leg power IC for the output. Look for a small IC attached to the heatsink. It will be marked TDA7293V. This is the likely defective part.

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