Help with ID of blown SMD chip in EHX Nano Metal Muff (U7)

[drewl]

Stumbled upon this thread while researching this pedal.

Was able to see enough to figure out the blown chip is a 2262, nice to have confirmation.

I have TWO of these with this chip fried, both owned by the same person.

[Mark Hammer]

It'll be a dual op-amp of some kind. You can confirm this by tracing the V+ and Ground lines to pins on the chip-remains. V+ should go to pin 8 and ground to pin 4.
I'd be surprised if it was anything OTHER than a 4558.

[52 Bill]

I've seen a lot of blown up TLC2272 chips in EHX pedals lately.

[MikeDBZ]

Sorry to necro this thread, but it's got the most complete set of photos of the metal muff nano with the revision C board. Well.. almost complete. resistor 52 is on the other side of one of the boards shown here. It's blown up on my pedal. The color markings are gone. I've looked high and low to find what resister goes there.

Here's some pics of the resistor blown up. And I thought it might be a 10 ohm resistor so I put one there and that fried too hahah.


Plugged the wall adapter power into an outgoing slot in my power supply and my pedals didn't like that but thankfully only the muff was damaged.

I figured one of you kind gentlemen must know what resistor 52 is. Any help would be greatly appreciated!!!

[x-pro]

If such a resistor is burned out, it is not the only element that is burned out.

[g1]

Is it connected to the jack? If so it's possibly a protection resistor and may continue to burn up until some other fault is repaired.
Is it wired in parallel with D2?

[x-pro]

by analogy, there could be such an input: https://oshwlab.com/earthicko/Metal-Muff
or : https://postimg.cc/QVMjxx3w

[The Dude]

Just a guess, but maybe the resistor goes to one side of D2 and the other side of D2 goes to ground and it's a protection diode. If the diode then shorts, the resistor burns. I would start by checking the diode. This would be a likely scenario if someone used the wrong power supply.

[g1]

by analogy, there could be such an input: https://oshwlab.com/earthicko/Metal-Muff
or : https://postimg.cc/QVMjxx3w

The second link there shows both R52 and D2 at the DC jack, so probably very close aside from the gate and top boost sections.

[DrGonz78]

If I was looking for zebras I would first say, “Maybe it’s one of those capacitors in parallel shorted out?” But we’re after the common horse here. The diode is like screaming at me! lol

[g1]

Anything shorted that runs off the 9V rail could burn that resistor.