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Lost solder pad

billybilly
edited February 2016 in Troubleshooting
In the act of removing an IC socket, I accidentally removed two solder pads from the back panel. I'm relatively new to soldering and I don't know the best solutions to lost pads. I know I've seen people placing copper replacement pieces on other PCBs borders. What is the best solution for this situation on this board?

Thanks

Comments

  • PaulusPaulus
    Hello billy,

    Removing solder pads accidentally is a common mistake, it happened to me a lot too!
    I never tried to place new copper pieces on the board, but I would not try it as you can't be sure the connexion will hold with the traces.
    The best way is to link the leg of your IC (or of your IC socket) with the components it is supposed to be connected to with a piece of wire.
    You can also follow the traces that goes from the lifted/broken pads and check where they go.

    You can even use a via, those little hole used to link on side of the pcb to another, to solder you replacement wire. Just be sure that you are doing the right connexions.

    Good louvk!
  • billybilly
    edited February 2016
    Okay, thank you. 

    It seems that it is the pads where pin 9 and 12 of the IC labelled U12 that have been removed. I’m not completely sure how to read the schematic but it seems that pin 9 connects to a node that splits with one direction going to pin 10 of IC U6 and the other going to resistor R26. It also seems like pin 12 goes to a node that also splits with one direction going to switch S32 (where do I connect on the switch) and another going pin 3 of the 10k resistor network RR9. 

    How exactly do you link the leg of the IC with component it? I just need a little of clarification. So I solder one end of the wire to the IC and what about the other end… Do I connect two wires per pin to each of these locations or should I try to access the node (which seems like a lot of work)? And what sort of wire do you use? 

    Thanks again, 
    Billy
  • julianjulian
    please see the attached pictures for the connections of pin 9 and 12.

    you just have to solder a wire to the bottom of the PCB. attach 1 end to the leg of the IC socket (on the bottom) and the other end to any point of the same trace. that should be enough.

    for example for pin 9, solder a wire to the 10k resistor in the bottom right.
  • billybilly
    Okay so I connected a wire from pin 9 to the resistor in the corner and another wire from pin 9 to pin 10 of that IC in the corner. Then, I also connected a wire from pin 12 to the switch and another wire from pine 12 to that resistor network above the IC. (There is a picture below - that is hard to see, sorry). Is there any redundancy in number of wires or is this good?


  • cj55cj55
    edited March 2016
    One of the connections from pin 9 is redundant, because there is already a connection between the resistor and the IC in the corner on the board. But doesn't matter.
    And please cut all component wires on the solder side as short as possible! They can easily bend and make shorts.
  • BaldWatsonBaldWatson
    edited May 2016
    Hi..as per my knowledge removing solder pads is a mistake.I
    never tried to place new copper pieces on the board, but I would not
    try it as you can't be sure the connections will hold with the traces.
    The
    best way is to link the leg of your IC with the
    components it is supposed to be connected to with a piece of wire.

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