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820-3476 1.5v on ppbus

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  • 820-3476 1.5v on ppbus

    Board had corrosion near R7150, that is all fixed and a broken trace on BMON_IOUT also fixed, U7100 was also shorted replaced that and now I get green then orange light on charger, but ppbus is 1.5v.

    Resistance on ppbus is 143oms with red probe on ground.

    I checked this post: https://boards.rossmanngroup.com/for...t-on-ppbus_g3h

    All good all the way to #10

    R7021/22 are good as well as traces

    # 11 U7100
    17 & 18: 144 and 281 ohms
    27 & 28: 730 and 616 ohms

    Resistance between pins 27 & 28 of U7100 was 720 oms so I replaced C7121 and C7122 and walla got fan spin.

    This was going to be a question but I end up finding out the answer as I was typing it.


  • #2
    Do you mean board is fully working now?

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    • #3
      Yes, all good after replacing C7121 and C7122 and doing all the other work I mentioned.

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