[iammax]

So my last good one’s blue button won’t unpress. It doens’t feel sticky at all, but it’s permanently “on”.

 

I opened the back (which I have done on this particular guitar once before, because the strum bar got jammed becuase there was an obstruction which I removed and it seemed to be a success) and removed the fretboard and blue was STILL pressed. So the problem is probably with the circuits or wires. So I followed the wire from the fretboard to where it goes and saw that there was all kinds of crud on the connection to the board it goes to (I’m not sure if it was, like, circuit paste or just dirt). I scraped a little off real gently (with my fingernail, which is probably a no-no for this kind of thing, but I thought it was going to be unfixable anyway) and suddenly blue was unpressed. I hope it stays fixed…

 

My question is does anyone know what that crud may have been? It looked like, well, dried scabs or something. Also, I am wondering if anybody has swapped around parts from broken guitars to good ones, and if so, did you mess it up in the process? I was pretty sure I was going to ruin the thing, but I don’t think I did…

[Nyxyxylyth]

So my last good one’s blue button won’t unpress. It doens’t feel sticky at all, but it’s permanently “on”.

 

I opened the back (which I have done on this particular guitar once before, because the strum bar got jammed becuase there was an obstruction which I removed and it seemed to be a success) and removed the fretboard and blue was STILL pressed. So the problem is probably with the circuits or wires. So I followed the wire from the fretboard to where it goes and saw that there was all kinds of crud on the connection to the board it goes to (I’m not sure if it was, like, circuit paste or just dirt). I scraped a little off real gently (with my fingernail, which is probably a no-no for this kind of thing, but I thought it was going to be unfixable anyway) and suddenly blue was unpressed. I hope it stays fixed…

 

My question is does anyone know what that crud may have been? It looked like, well, dried scabs or something. Also, I am wondering if anybody has swapped around parts from broken guitars to good ones, and if so, did you mess it up in the process? I was pretty sure I was going to ruin the thing, but I don’t think I did…

Just good old tarnish.

http://www.robotroom.com/PCBTarnishEraser.html

 

In more exotic cases, it could be dendritic growth, or tin whiskers, but I’d suspect garden variety oxidation first.

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