Electronics > Beginners

Motorcycle dash button failed

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techman-001:

--- Quote from: schmitt trigger on November 11, 2019, 12:33:58 am ---I am surprised that the board is not conformally coated.

The motorcycle environment is harsh. Is not only plain moisture ingress, but that the road may still contain salts used during the winter season.

Plus many owners pressure-wash their bikes, and you'll have soaps and other chemicals.

--- End quote ---

Conformal coating isn't all win-win. For instance if there is a electronics failure, the board can be virtually un-repairable depending on how tough that coating is.

GeorgeOfTheJungle:
You can fix that with a piece of 30 AWG wire wrapping wire (google "ok 30 awg kynar").

AndyC_772:
Don't touch the LCD pins; I can virtually guarantee that you'll do more harm than good unless you're already experienced in this type of PCB rework.

Personally I'd start with an abrasive fibreglass pencil. Use it to remove the corrosion and the solder mask on the affected trace(s), so you can clearly see where any breaks are. It'll also leave a clean, oxide free surface that you can solder too.

Bridge any breaks with solid core wire as advised above. Even if it's just a hairline crack, using copper wire (which is ductile and not brittle) will give a longer lasting repair than just a solder bridge, which can easily fracture under vibration.

Test before reassembly, obviously. Once you're happy that it's working, it would do no harm to coat the area with a protective layer - though it could be argued that the problem is water getting in at all, not that there's any particular issue with that specific part of the PCB.

schmitt trigger:

--- Quote from: techman-001 on November 11, 2019, 11:07:48 am ---

Conformal coating isn't all win-win. For instance if there is a electronics failure, the board can be virtually un-repairable depending on how tough that coating is.

--- End quote ---

Engineering is the art and science of compromise of conflicting requirements.
It is true that a conformally coated board may become un-repairable, but it would be better that the board does not become defective due to environmental factors.
Clearly a motorcycle environment qualifies as a challenging enviroment.

But again, when one is designing a product, and a business case is being made, these decisions are made.

m3vuv:
what make and model bike is it?

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