What is causing this.

JWHassler

Joined Sep 25, 2013
306
I came across this this today, and I was wondering what caused this. The circuit is outside, but in a casing so it will not get wet by rain or water. The casing is not waterproof or air tight.

It looks like the circuit has started to corrode or grow mold.

View attachment 75246 View attachment 75247
Could it be something other than water/moisture?
Maybe someone used no-rosin flux for touching up some joints and then sprayed flux-cleaner on it instead of water.
 

Thread Starter

nerdegutta

Joined Dec 15, 2009
2,684
I'll clean the PCB with isopropyl
Back to the OP.

"The casing is not waterproof or air tight."

?
No it is not. It is plastic. And only protecting against direct rain.

I'll clean the PCB with isopropyl alcohol and a toothbrush. Let's hope it works.
 
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