Cold Joint PDB?

Discussion in 'CineStar FAQ - Tips and Tricks' started by Zach Beggs, Aug 13, 2013.

  1. Zach Beggs

    Zach Beggs Member

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    Riley at QC soldered my PDB, but looking at the main leads, does it look like a cold joint compared to the BLs?

    Thanks guys!

    [​IMG]
     
  2. Gary Haynes

    Gary Haynes Administrator
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    Hard to tell but looks ok to me.
     
  3. Zach Beggs

    Zach Beggs Member

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  4. Zach Beggs

    Zach Beggs Member

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    Unrelated, but my PDB is conformal coated.
     
  5. Gary Haynes

    Gary Haynes Administrator
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    Nice and glossy. Still looks fine.
     
  6. Zach Beggs

    Zach Beggs Member

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    It's got a shine but it's flat compared to the chrome on the BL pads.
     
  7. Gary Haynes

    Gary Haynes Administrator
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    Smaller wires on the BL pads. If you are concerned get hold of Riley and see about getting it redone.
     
  8. Adam Paugh

    Adam Paugh Distributor

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    Zach,

    A cold joint will appear rough/lumpy at the surface. This one has a smooth, shiny surface which indicates a proper joint.

    Greetings,
    Adam
     
  9. Nick Adams

    Nick Adams Member

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    Dito Adam, mine looked dull, I would also add that one looked slightly pitted before I re-soldered it.
     
  10. Nick Adams

    Nick Adams Member

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    Not wanting to hijack a thread but I think its relevant.
    Is it possible to have two power inputs connected to the PDB?
    It would seem, if you could do that, you would not need to run two parallel
    batteries into one wire that is connected to the PDB. You could have two batteries connected to two separate
    parts of the PDB, therefore creating some redundancy.
    My copter is in for repair, otherwise I would look at the board.


    Nick
     
  11. Gary Haynes

    Gary Haynes Administrator
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    It would be tough given the size of the pad. Probably the only way that might work would be to pull insulation off of the middle of a length of wire. About the size of the pad and the solder to the pad. Not much room and the routing of the subsequent long pair of wires would be interesting. Don't know of it ever being done.
     
  12. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    And, if you ever connect up two batteries at different voltages, the higher voltage battery could release a significant current (depending on the difference in voltage) into the lower voltage battery via the PDB traces. A great way to fry the traces on the PDB if the current was too high. Spendy!

    Andy.
     
  13. Zach Beggs

    Zach Beggs Member

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    Speaking of fires.

    Andy have you paracharged your 10,000s yet?
     
  14. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Afraid not. My day job has raised it's ugly head for a few days, plus I've been doing my annual inspection on the C8's -- which means (for me) a complete tear-down for inspection of all the pieces and a rebuild.

    Andy.
     
  15. Zach Beggs

    Zach Beggs Member

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    Im afraid to charge them to 100%, given the storage charge being off by 15 or 20%

    Even the QC1200s I'm not sure if I should paracharge
     
  16. Nick Adams

    Nick Adams Member

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    Makes sense and one thing I don't need is 'Spendy':)
     
  17. Gary Haynes

    Gary Haynes Administrator
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    Zach why do you think the storage charge is off by 15-20%?
     
  18. Dave King

    Dave King Well-Known Member

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    Looks like a really good solder job to me. Riley does great work.
     
  19. Howard Dapp

    Howard Dapp Active Member

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    I hope Riley works in a well ventilated area or wears a respirator/fume mask if he's soldering day in and out.
     
  20. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    He does. Montana is well ventilated. :)
     

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