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Burned off LED soldering pads

hihatnsnarehihatnsnare
edited June 2014 in Troubleshooting
Hello all!

My step 15 LED was burned out, so I ordered another one. In the process of removing to faulty one, I seemed to have burned off the metal soldering pads. How do I go about fixing this?

Comments

  • widdlywiddly
    You could follow the trace where the pad lifted to another soldered component and then solder in a little piece of fine hook up wire.  Kind of like this...

    http://wiki.aussiearcade.com.au/images/4/4a/Pcb_repair_wardner_2_2.jpg
  • julianjulian
    edited June 2014
    these are the connecti0ons for the 2 pads.
    image
    if it is the lower pad it is quite simple, because you could just use the R_LED pad next to it.
    for the upper pad wire is the way to go.
  • hihatnsnarehihatnsnare
    Thanks for the quick replies, guys. Both pads are gone, so I'll solder the negative lead to the RLED pad and wire the positive lead to pin 1 of that chip. The wiring diagram was exactly what I needed.

    I'll give this a go tomorrow and I'll update.
  • hihatnsnarehihatnsnare
    edited June 2014
    This didn't work... Could there be a problem somewhere else that would prevent only light 15 from lighting up? There's continuity between all of the points on each wire so it's properly soldered, and I know the polarity of the LED is correct.
  • julianjulian
    hmmmm... it is on the first shift register in the chain, so I doubt there is a problem with the shift registers. otherwise the following LEDs would not work.

    maybe have a closer look at the 220 resistor network RR1. LED15 is connected to pin 2.

    there is not much more to the LED.
    U3/pin1 puts out 5V and is connected to LED15. the other side is connected to rr1/pin2 (resistor) which is connected to gnd.
  • hihatnsnarehihatnsnare
    Well, there seems to be nothing wrong with RR1.  I don't think there's much else I can do.
  • drkorgdrkorg
    Try downloading the latest firmware again. I had a similar issue. Led for drumvoice nr 4 died. I changed it and everything was fine for a week then it died again. Didn't have the energy to open the case and change it again so I let it be. When I a few days ago upgraded to 0.34 I suddenly started to work again. Now it's working perfectly.
    I can't really either understand nore explain but everything is fine now.
  • hihatnsnarehihatnsnare
    Yeah I was actually thinking about doing that. I still have the stock firmware, so maybe that might have something to do with it? I'll give it a shot.
  • hihatnsnarehihatnsnare
    I updated to 0.34 and it still doesn't work...
  • hihatnsnarehihatnsnare
    edited June 2014
    Could it have something to do with the leads going through the old holes? Could there be residual metal in there that would cause a short?

    Another possibly related problem, when I turn the unit to the side (the top is perpendicular to the ground), the voice, perf, and step light get very dim and then go out. When I put the unit flat again, the lights go back to normal.
  • julianjulian
    hmmm, possibly a cold soler joint on the shift registers?
    there is no gyroscope sensor build in ;)

    regarding step 15
    If it should be lit (step active) what do you measure on pin 1 of U3 (hc595)
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