Electronics > Projects, Designs, and Technical Stuff

strange burning on mains PCB

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julianhigginson:

--- Quote from: Psi on March 02, 2020, 12:47:34 pm ---How are they cleaning the bathroom.
Are they hosing down the floor, walls and ceiling with strong chemicals and then again with water?
Sometimes they design bathrooms to be cleaned like this because it is very time efficient.
Maybe some caustic fumes are getting to the PCB and damaging parts, Making them fail shorted or semi-shorted.

--- End quote ---

good question! I'll ask that and see if my guy knows. the devices are pretty well sealed though.. 2 part plastic case that clups together and is glued at a few points for good measure... cable grommets around mains cable going in and out of the box... any ingress points will be very small and thin.

james_s:
I've seen boards burn that got wet, or got leaked electrolyte (which is just another type of wet), and I've seen bad solder joints on high current connectors arc and burn. I've seen bad connectors oxidize and burn. Once something gets hot enough to carbonize something, carbon is conductive and will self sustain additional burning.

Phoenix:

--- Quote from: Gyro on February 28, 2020, 08:16:24 pm ---RIFA metallized paper cap by any chance?

--- End quote ---

Sounds like the "good old" RIFA caps... Does it look anything like these
https://www.badcaps.net/forum/showthread.php?p=382644

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