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Fender Rumble 115 cabinet not working all the sudden

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dano2

Feb 3, 2026
8
3
#1
hi all, per the title, my Rumble 115 stopped working. Fear that the input on the back burned out or something. I took a look
but saw nothing, everything is all connected, no loose wires. I noticed that there is a small circuit board. I called fender but
because its not on warranty any longer they cant really help. But said there should be a part number if you pull out the circuit
board, no screws unable to pull out circuit board. Got a couple number off of it but nothing showing up in google. Running
out of ideas unless i want to take it to an electronics place, ugh... im a pretty good DIY person so if I could find the thing
I could just splice on a whole new input on the back... any thoughts or ideas" greattly appreciated.
 
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#22
You might be “good at DIY, but unless you understand what you are looking for and want to measure (and why), you aren’t going to get to the bottom of the root cause.

This is why qualified techs are techs and not “crystal ball guessing wizards”.
 
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#24
Re instrument cable: Unless you push a serious enough current to exceed 125 °C, it won't burn through the insulation and won't cause the cable to short.
Even if it did, it would affect the amplifier, which would go into protection mode.

If the amp plays fine with another cab, then accidentally using the instrument cable hasn't done anything to your gear.

As I said: get a multimeter. The easiest test without even opening up the interface plate is to plug in a speaker cable and measure resistance between the tip and sleeve.

If it's zero (a short) or infinity (a break), that's bad.

If it's neither, then it's fine.

If you don't have a multimeter, another easy test is to take a 9 V battery and touch the tip and sleeve briefly several times. You should hear a pop from the speaker. It's not possible to damage a bass or guitar speaker this way.
 
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#27
dano2 said:
No, all i want is to fix it, not interested in analyzing etc, I'd rather be playing music etc.
I'll probably just call Fender or take it to a repair place. Thanks....
Click to expand...
Right, the entire point of my suggestion is that if you can't analyze it to determine what's wrong, then how are you going to know exactly what to fix?

Any Fender (electronics) service center should be able to fix this easily and it shouldn't cost a lot unless the speaker itself is damaged (unlikely)
 
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#28
Short of taking it to a shop, which is never a bad idea, I think the best thing is to find a friend who has a bit more experience with the audio/electrical stuff. Its a question of going through things in an orderly manner and eliminating possibilities. It doesn't sound like that's really your deal, which is fair enough. I suggest you try different speaker cables just to eliminate that, but beyond that its going to be a bad socket, a bad connection inside or worse, and I gain the impression that's going to be a bit more complicated to fix than you would want to get into.
 
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#29
toughluck said:
Re instrument cable: Unless you push a serious enough current to exceed 125 °C, it won't burn through the insulation and won't cause the cable to short.
Even if it did, it would affect the amplifier, which would go into protection mode.

If the amp plays fine with another cab, then accidentally using the instrument cable hasn't done anything to your gear.

As I said: get a multimeter. The easiest test without even opening up the interface plate is to plug in a speaker cable and measure resistance between the tip and sleeve.

If it's zero (a short) or infinity (a break), that's bad.

If it's neither, then it's fine.

If you don't have a multimeter, another easy test is to take a 9 V battery and touch the tip and sleeve briefly several times. You should hear a pop from the speaker. It's not possible to damage a bass or guitar speaker this way.
Click to expand...
 
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#31
5 seconds of googling would show you this:
1770904622501.png

Plug in your speaker cable to the cab. Touch the tip with one battery terminal and the sleeve with the other terminal briefly.

That's it.

But I'm assuming you're using a jack terminal on the cab since you mentioned using an instrument cable.
 
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#33
dano2 said:
Thanks so much everyone but it's now working due to a friend that posted out i had it plugged into the wrong jack
Click to expand...
Ugh, this is why details matter...
 
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Solution
#36
Lobster11 said:
This is right up there with "oops, it wasn't plugged in."
Click to expand...
Happens a lot unfortunately, especially when a rig is more complicated than the player can reasonably deal with. We see it a LOT on the guitar side of things.
 
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#38
rodl2005 said:
More on the guitar side surely 😇
Click to expand...
I shamefully must admit I did a similar thing the other day...

Couldn't get a signal out of the supplied backline Mark Bass amp. Had signal going in... not coming out.
Tried my speakon lead, tried my BAmp. . Nothing.

Gain was OFF, on both amps 😳
Didn't check that till dang last thing. 🤫
 
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