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(Topic ID: 136750)

Can this System 11B be repaired (alkaline damage)


By Cheddar

5 years ago



Topic Stats

  • 23 posts
  • 10 Pinsiders participating
  • Latest reply 5 years ago by barakandl
  • Topic is favorited by 3 Pinsiders

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    #1 5 years ago

    Ok this system 11b board is pretty nasty. Looking at the front there are several dozen components to be replaced. The back looks ok at first but the connectors at the bottom, ugh!
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    To top it off a couple of previous repairs were not finished (looks nasty)
    IMAG1093.jpg

    Opinions appreciated.

    #4 5 years ago

    So used or refurbished original or rottendog. Any other options or opinions?

    #6 5 years ago
    Quoted from RCA1:

    I like your shoes.

    Lol, I thought I had my junk out. What a day to actually be zipped!

    #9 5 years ago

    And thanks for all the love for my "Air Jesus" shoes!

    #11 5 years ago

    Ok anybody got a refurbished or used board?

    #12 5 years ago

    Update: I was able to install the board and while it did not boot by itself I was able to complete a boot using the cpu button. I got sound, coils, buttons and displays. I was unable to get very far into the service menu. I think the connector under the worst of the damage had the service buttons on it so that would explain it.

    I put my ES board into it and was able to boot completely. same issues with the service buttons.

    Next steps:
    I want to test out the power supply and test points before I put any real load on the ES Board.
    I'll repin the affected connectors and see where that gets me.

    Anything you guys think I should check?

    I think this machine can keep the ES board. If I buy a RD replacement I'll put it in my ES

    #13 5 years ago

    Update 2:

    I removed the affected connectors, the pia nearest the battery holder, the ceramic resistors and the relay. The board looks pretty good underneath it all. The mask has lifted under the resistors but that is probably heat damage.

    I think this board can be saved. Time for the wash and some continuity checking.

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    #15 5 years ago

    Update 3: rinsed with white vinegar, scrubbed worst areas with toothbrush. Soaked 15 minutes

    Rinsed with distilled water, blew dry with compressor

    Rinsed with 91% alcohol, blew dry with compressor

    Looks much better. I'll probably replace the resistor network above the big resistors but everything else looks pretty good.

    IMAG1126.jpgIMAG1127.jpgIMAG1128.jpg

    #16 5 years ago

    I'm putting together an order for replacement parts. I already have Pia's and connectors, plenty of crimp ends and an external battery pack.

    I am ordering the 2 watt resistors, male header pins. Can anybody recommend other components to have on hand while repairing this?

    Thanks

    #18 5 years ago

    I'll check that out. I am thinking about pulling a couple more chips too.

    #19 5 years ago

    Ok I inspected that area.no bubbling happening.I think this is uneven oxidation from the lifted mask.

    I'll see if I can track down a better camera and get some better picks.

    Should I try and remove the oxidation in some manner?

    Update: looks like I can clean up the oxidation with a fiberglass pen

    #22 5 years ago

    I tried magic eraser without much effect. I think it's too fine for the job. I'll pick up a fiberglass pen at radioshack now that they are back.

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