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(Topic ID: 252975)

Bally MPU’s suck


By oldschoolbob

1 year ago



Topic Stats

  • 24 posts
  • 13 Pinsiders participating
  • Latest reply 1 year ago by oldschoolbob
  • Topic is favorited by 1 Pinsider

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    #9 1 year ago

    You still have copper so all is not lost. The "tinned"coating is just scaling off.

    When boards do this they often also get the solder bubble effect which drives me crazy.... where you form a joint and as it cools down a bubble forms inside the solder and it pops leaving a crap joint. Reheat and add more solder, pops again, over until finally get a nice joint formed. No amount of even the most aggressive flux helps and too much makes it worse

    Roughing up the copper with fine sand paper helps get the new solder to stick. Just dont sand through the copper. The copper will re-tarnish over again in days/hours so gotta solder before that happens.

    #22 1 year ago
    Quoted from BigAl56:

    Just wondering why you needed to remove all the headers completely? Seems to me that operation has the potential to cause more damage than simply re-flowing the solder on the headers as-is.

    The plating of the headers corrodes, rubs off from connector cycling, tarnishes, etc after the 40 long years. Unless the MPU was saved from battery leak and kept in a good environment its entire life the header pins are usually in really bad shape.

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