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Chip`s plastic protection removing ?

Discussion in 'General Electronics Discussion' started by AlenZGB, Apr 20, 2016.

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  1. AlenZGB

    AlenZGB

    179
    5
    Feb 19, 2014
    Hello,
    I was wondering with what can i clean that bluish plastic pin protective cover from motorola chip,and not
    damage chip or board in the process?


    [​IMG]


    P.S.
    I did not edit the picture, found it on the web, but have exact same chip.
     
  2. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Why do you need to remove it?

    Is it for getting a contact with the IC's pins?
    If so you can gently scrap it with a scalpel on pins you are after.
     
  3. AlenZGB

    AlenZGB

    179
    5
    Feb 19, 2014
    i need to reflow all the pins from this motorola chip,if this dont help ill have to remove it and
    solder another one.
    I try to avoid the scraping part if i can.
    Im a mechanic, if you know what i mean hahaha
     
  4. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    O.K.
    If you need to reflow it ,you should use a heat gun with adjustable/controllable temperature.
    Do you know how to remove/reflow an IC like it?
     
  5. AlenZGB

    AlenZGB

    179
    5
    Feb 19, 2014
    I remove EEPROMs from car ECU us and IMMO units, but they were 8 or 10 pins no of tham was
    32 (i think) like this one. I have hot air station, adjustable.
    Use alot of no-clean flux and watch not to blow something around it :D
    Any suggestion is welcomed.


    EDIT: way more than 32, silly me :D
     
    Last edited: Apr 20, 2016
  6. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Set the gun to 260 Celsius and try it on a corner of the IC pins with the blue stuff(till the solder melts).
     
  7. AlenZGB

    AlenZGB

    179
    5
    Feb 19, 2014
    ill try that, car is coming in saturday then illdo this.
    Ill let you know how it went.
     
  8. AlenZGB

    AlenZGB

    179
    5
    Feb 19, 2014
    I bought something in paint store, for removing old paint and stuff, and it worked.
    Dont have pictures because i had to do it faster, so i didnt have time to tak pictures.

    Thanks @dorke
     
  9. dorke

    dorke

    2,342
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    Jun 20, 2015
    That is something I wouldn't recommend!
    Make sure you cleaned the paint remover very thoroughly it can be corrosive and in time may damage the traces on the board!
     
  10. AlenZGB

    AlenZGB

    179
    5
    Feb 19, 2014
    I did clean it very very well!
    I didnt find any other solution for that, how can you replace that kind of microcontroller that
    are protected like that ? Without damage the board ?
     
    Last edited: Apr 24, 2016
  11. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    You should use a hot air heat-gun with temperature control.
    It isn't very difficult but you should know how to,and there is a risk of damage.
    look here from 5:08 on.
    and here from 12:10 on.
    Also note that if the IC doesn't come off easily it may have it's "belly" glued to the board.
     
    Last edited: Apr 24, 2016
    AlenZGB likes this.
  12. AlenZGB

    AlenZGB

    179
    5
    Feb 19, 2014
    Really good tutorial, that second longer one.
    As for the glued ICs, i learn that but broke one, but it was from some old engine ECU that was for my learning,
    so no harm was done :)

    The one that i treathed with that solution that desolves old paint and plastic cover, i clean from
    that solution and flux, and spray it with plastic in can.

    This one:
    http://www.chipoteka.hr/artikl/2576/spray-plastic-70-200-ml
     
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