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Mild corrosion on a circuit board

Discussion in 'Electrics UK' started by phatboy, 16 Oct 2020.

  1. bernardgreen

    bernardgreen

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    I did mean Drying ( The keyboard moved )
     
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  3. Harry Bloomfield

    Harry Bloomfield

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    But I quite liked the idea of frying :)

    If there are no fancy components on the PCB, I tend to just give the a wash in washing up liquid, warm water, with an old toothbrush to try to clean any water damage off, followed by a thorough rinse under running hot water, then blow the remaining water off with a compressed air line. You have to be gentle with the brush, on modern high density PCB's. I would then put the PCB on top of a radiator (when on in winter) or use a hair dryer in summer to get it completely dry. If I still have doubts about possible corrosion and if an low voltage only board, I would give it a through soak in WD40, which will help kill the existing corrosion and prevent it getting any worse, leaving a waxy deposit.
     
  4. JohnW2

    JohnW2

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    There seems to have been some confusion about "IPA" - some of the tongue-in-cheek comments (including some from me) related to India Pale Ale, not isopropyl alcohol ;)

    Kind Regards, John
     
  5. JohnW2

    JohnW2

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    If I use meths, then 9similar to Harry) I rinse it off with running water (rather than waiting for it to dry), at the same time giving it a good scrub with something like a toothbrush. I must say that I would not bother about the water being de-ionised.

    Kind Regards, John
     
  6. bernardgreen

    bernardgreen

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    Not recommended as jets of compressed air can create static electricity with enough energy to fry ( not dry ) sensitive micro electronic components
     
  7. phatboy

    phatboy

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    Ha, no confession here, as it happens we get some lovely IPA's here in Jersey, which I would be pleased to enjoy after resolving this issue :)

    I've poked around the unit a little more.... Im reasonably confident with electronics, however have never needed to clean up a circuit board, does this one look salvageable with a reasonable amount of work? I am now thinking it never got 'wet' but water was below it, and condensation left it on the board.

    IMG-5604.jpg
    IMG-5607.jpg

    Thanks for all the replies, a wealth of knowledge here and numerous options! It has a control panel attached through to a different board, so before running under water (terrifying thought!) I would need to separate them of course.
     
  8. Harry Bloomfield

    Harry Bloomfield

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    The back of the board looks water stained.

    Someone has cut the earth conductors from those flexes.
     
  9. phatboy

    phatboy

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    Best course of action from here...? :)
     
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  11. JohnW2

    JohnW2

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    Not really terrifying, so long as you dry them thoroughly before further use! I've often done it.

    Kind Regards, John.
     
  12. phatboy

    phatboy

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    I think this was an edit after I replied, but that's nothing to worry about.... I only had 3-core available when fitting... it's a volt-free connection to a relay elsewhere, nothing to be concerned about :)
     
  13. Harry Bloomfield

    Harry Bloomfield

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    As already advised - just give it a good wash down to get that water staining off, finally a good rinse, a good dry off, then decide whether to spray it with WD40 to stop any corrosion.

    I'm seeing some water damage on the top side of the PCB as well, when I zoom in.
     
  14. Colin Brenton

    Colin Brenton

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  15. Keithmac

    Keithmac

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    You can spray it with conformal coating after cleaning and drying to waterproof it.
     

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  16. mattylad

    mattylad

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    Clean it as advised.

    Do NOT spray WD40 over it, WD40 is not a product that is designed to be used on PCB's.
     
  17. winston1

    winston1

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    Circuit boards in boilers and such like are sold at disgustingly rip off prices. They often have less on them than a £5 radio.
     
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