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820-3208-a

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  • 820-3208-a

    R6905 keeps blowing up before diode D6905 and reaching pp3v42.

    Any idea why?

    Its been trolling me for some time now.
    Attached Files
    Last edited by patrickribbsaeter; 11-04-2019, 11:50 PM.

  • #2
    "reaching pp3v42"
    Who?
    I don't really understand what you mean...

    Check all 4.7uF (C6990-97) placed after D6905 and U6990.
    Now D6905 is probably shorted too.

    Comment


    • #3
      C6991 is shorted to ground. I detached the CAP. the short is still there inside the board it seems under the pad... How do I go about to solve that issue? drill a hole in the board through it?



      (pp3v42.. forget that, i was just mumbling.)
      Attached Files
      Last edited by patrickribbsaeter; 11-06-2019, 12:31 AM.

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      • #4
        Dig a bit in the board, until short is gone.
        You can also try to cut off the trace and bypass "on air" that point, if needed.

        Comment


        • #5
          hi 2informaticos, sorry late reply, was busy with my other businesses..

          I dig the bottom, there is no continuity now.. But the resistor 10 ohm, still exploded after putting a new one... So strange. what could cause that to happen.. ? The trace is inside the board to the other side.. wont be possible to cut off the trace, unless u have a great idea how to?

          I could add jumpers from that cap to the other points its should connect to and see what happens. What do u suggest?

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          • #6
            You can discard one cap.
            Be sure to have continuity for all others and no short, or low value to ground.

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