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[SOLVED] 820-3115-B Pulsing charger light

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  • [SOLVED] 820-3115-B Pulsing charger light

    Very new to this so may be an obvious one.

    Corrosion around the area pictured.

    Fuses and resistors in this area test ok.

    Have replaced:

    C6991
    Q7030
    Q7035
    Q7630
    Q7080
    C7030
    C7035
    Q7931

    Pulses the green charger light the same as it did before the swaps. Fans spins for between 0.5 - 3 seconds every 1-2 seconds. If you listen very carefully, a tick.. tick....tick noise is coming from somewhere over the side of the board where the corrosion was, at least that's where it appears to be coming from. When the fan is spinning the tick...tick.tick disappears. This was still audible when all of the above components were off the board. Any clues please.

    Cheers

    Stewart

  • #2
    Resistance between pins 17 and 18 of U7000? Also pins 27 and 28?

    Comment


    • #3
      Wow, thanks for the quick response. Will check in the morning. I'm beat, it's late here.

      Comment


      • #4
        Hi, just checked and no resistance at all from those points.

        Comment


        • #5
          So u7000 is shorted or both c7020 and c7050 are. My bet would be U7000.

          Comment


          • #6
            Thanks for the reply. Unless the donor U7000 is also faulty, no joy with replacement. Back to the same situation. Ticking persisted even with U7000 off the board. C7020 and C7050 don't test as shorted...

            Comment


            • #7
              PPBUS_G3H fluctuates?
              PP3V42_G3H too?
              Post voltages as U7000...

              Comment


              • #8
                PPBUS_G3H = 3.6v while pulsing/ticking 11.65v when fan spinning
                PP3V42_G3H = 3.45v Constant

                U7000:

                Pin1 = 16.3v Constant - 0.1-0.2v drop when fan starts
                Pin2 = 16.3v Constant - 0.1-0.2v drop when fan starts
                Pin3 = 3.9v Constant - 0.1-0.2v drop when fan starts
                Pin4 = 3.42v Fan off, 0v Fan Spinning
                Pin5 = 0.2v Fan Off, 2.8v Fan Spinning
                Pin6 = 3.45 Constant
                Pin7 = 0.7v Fan Off, 2.8v Fan Spinning
                Pin8 = 0.44 Fan Off 1.63v Fan Spinning
                Pin9 = 0.03v Constant
                Pin10 = 3.45v Constant - 0.1-0.2v drop when fan starts
                Pin11 = 3.45v Constant - 0.1-0.2v drop when fan starts
                Pin12 = 3.45v Constant
                Pin13 = 3.14v Constant
                Pin14 = 2.36v Constant
                Pin15 = 0v Fan Off, 0.05v Fan Spinning
                Pin16 = 2.8v Fan Off, 10.02v Fan Spinning
                Pin17 = 2.8v Fan Off, 10.72v Fan Spinning
                Pin18 = 3.5v Fan Off, 11.4v Fan Spinning
                Pin19 = 5.02v Constant
                Pin20 = 5.02v Fan Off, 4.96v Fan Spinning
                Pin21 = 0v Fan Off, 1.22v Fan Spinning
                Pin22 = 0v
                Pin23 = 3.5v Fluctuation Fan Off 14.6v Fan Spinning
                Pin24 = 3.5v Fluctuation Fan Off 16.2v Fan Spinning
                Pin25 = 4.53v Fluctuation Fan Off 14.6v Fan Spinning
                Pin26 = 14.6v Fan Off, 14.3v Fan Spinning
                Pin27 = 0v
                Pin28 = 0v

                Comment


                • #9
                  Resistance between pins 17 and 18 should be about 3ohm and between 27 and 28 should be 20ohm, check if those values are true in your board please....

                  Comment


                  • #10
                    I don't buy "no resistance" between pins 17/18 and pins 27/28. Please do not use meter in beeping mode, it beeps even at 50 ohms. Read resistance off it and check again!

                    Comment


                    • #11
                      Thanks for the replies chaps. I've just had another go to be sure and it's definitely the same results as before. OL between those pins. I even changed the battery in the meter. So I understand the train of thought here, what will these results tell us?

                      Any idea what the ticking noise is that I can hear?

                      Comment


                      • #12
                        OL is open line, the exact opposite of no resistance. Check all the resistors between those pins and check continuity between them.

                        Comment


                        • #13
                          Sorry, my bad, lack of experience and lack of decent, unbroken sleep meant I ballsed up the terminology.

                          Pins 27 and 28 have continuity to R7021 and R7022 are correct at 10ohm
                          Pins 17 and 18 have continuity to R7051 (2.5ohm) and R7052 (0.3ohm)

                          Any clues on ticking noise?

                          Comment


                          • #14
                            We mean resistance between the pins themselves, not to the resistors. Measure with one probe on pin 17, the other on pin 18, in resistance mode, and te same again for 27/28. This will tell us if there is a break in the current sensing circuit. if the machine an't sense how much current the battery or the charger is using it will turn it off, which is why you get a flickering light. Noise no idea, probably something switching on and off. Fix current sensing first.

                            Comment


                            • #15
                              Tested again just now. No reading between Pins 17 and 18 or 27 and 28. So a break in the current sensing circuit then?

                              Again, apologies for the balls up and appreciate the patience.

                              Comment

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