Marks on the PCB

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  • Askic
    Senior Member
    • Sep 2018
    • 187
    • BIH
    #1

    Marks on the PCB

    Hello guys,
    what would you say if you see marks on the PCB like the one shown in attached pictures?
    Are those traces from liquid or something else?

    Thank you!
    Attached Files

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    Tags: None
    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England
      #2
      Re: Marks on the PCB

      Crusty looking capacitors, green vias, looks like liquid to me.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 31284
          • Albion
          #3
          Re: Marks on the PCB

          the green vias are solder-mask to protect the conductive paint.

          the white could be a sign of moisture or just poor factory de-fluxing.

            Comment

            • Askic
              Senior Member
              • Sep 2018
              • 187
              • BIH
              #4
              Re: Marks on the PCB

              Originally posted by stj
              the green vias are solder-mask to protect the conductive paint.

              the white could be a sign of moisture or just poor factory de-fluxing.
              This board was in spare parts stock for about 10 years. It wasn't properly sealed but never used. I'm gonna use toothbrush and some isopropyl alcohol to clean it.

                Comment

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