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Repair infrared soldered connection?

Discussion in 'Electronic Repair' started by Ken, Sep 30, 2007.

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  1. Ken

    Ken Guest

    I have a cordless phone with a LCD that has some of the characters
    missing. I was able to determine it is a poor connection at the point
    which a flex ribbon cable is attached to the PWB. That connection is
    apparently soldered with the infrared technique. Does anyone have any
    ideas on how such a connection could be repaired with common electronic
    repair tools?

    Obviously it can be done with the tools used to assemble the circuit
    when made, but not many people have such tools in their homes. Thanks.
     
  2. JANA

    JANA Guest

    You need the proper tools. Call Sony or one of their service centres and see
    if they will do it for you. It is very possible that they only buy and
    replace the parts only.

    --

    JANA
    _____


    I have a cordless phone with a LCD that has some of the characters
    missing. I was able to determine it is a poor connection at the point
    which a flex ribbon cable is attached to the PWB. That connection is
    apparently soldered with the infrared technique. Does anyone have any
    ideas on how such a connection could be repaired with common electronic
    repair tools?

    Obviously it can be done with the tools used to assemble the circuit
    when made, but not many people have such tools in their homes. Thanks.
     
  3. N Cook

    N Cook Guest


    Can you bodge something in the way of mechanically compressing the contacts
    using wrap-around cable tie/s and "folding wedges" from wooden clothes pegs
    ?
     
  4. Or, I was going to suggest silver (conductive) Epoxy.

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  5. Ken

    Ken Guest

    We must have gone to the same school. I wedged into the area of the
    connection a piece of hard rubber that will press against the area when
    the phone is closed. It is working, but I wish there was a permanent
    fix. With so many on this newsgroup fixing so many things, I thought I
    would ask if anyone had fixed such a connection. Thanks for the reply.
     
  6. Ken

    Ken Guest

    Conductive epoxy? Do you have a brand or type you have used?
     
  7. Andy Cuffe

    Andy Cuffe Guest

    This is one of those cases where they had trouble making good
    connections under ideal factory conditions, so doing better at home is
    unlikely. I hate this design because it's basically non-serviceable.
    I've had some luck heating the area that has the bad connection by
    pressing a soldering iron against it. You have to be careful that the
    tip isn't hot enough to melt the plastic (use a variable temperature
    soldering iron). Even after that, installing something to apply
    constant pressure is a good idea.
    Andy Cuffe

     
  8. I'm a bit unclear about this. LCDs are often connected to the PCB with a
    conductive-rubber band. It seems odd that one would be soldered in.
     
  9. Ken

    Ken Guest

    This one uses a flex cable of the ribbon type. It appears that the
    conductors are soldered with solder paste using the IR heating
    technique. The problem in heating the connection again is the plastic
    the conductor is mounted on will be damaged unless you use a low temp
    iron or the original IR process of heating the solder paste during assembly.
     
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