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Hp 840 g1 6050a2560201-mb-a03

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    Hp 840 g1 6050a2560201-mb-a03

    Hi all, i have a problem with mentioned board. I know that there was a liquid damage on U6600 and U6610 and there was short on 3.3V i have 2.8V and Q6100 was overheating. I change all of mention components and some aditional but no luck. After detail cleaning a have manage to get stable 3.3V and 5V. Now when i connect charger i have only short power LED blink and thats all. And voltage on Q6100 is about 0.87V (lower than needed). I tried to change Q6000, Q6001, U6000, U6200 but is the same. Any hint, what to try?
    Last edited by dakiza; 08-08-2022, 11:01 AM.

    #2
    Re: Hp 840 g1 6050a2560201-mb-a03

    Start with sheet 5 of the schematic = charger IC @ U6000.

    Review the DCIN mosfets @ Q6010 & Q6011. Often the 2nd mosfet gets damaged.

    Confirm the voltages on each of these mosfets (source ; drain; gate).

    A good idea to also, with great care, measure the voltages on each pin of U6000 charger IC.

    Post your measurements.

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      #3
      Re: Hp 840 g1 6050a2560201-mb-a03

      Thanks in advanced. This is measurments:
      Q6010 D - 19.47 S - 19.47 G - 6,12
      Q6011 D - 19.47 S - 19.47 G - 25.6

      And this is the measurment on "good" board (have problem with 3.3 and 5 rails) But have good voltage on Q6100 ~ 1.3V

      Q6010 D - 19.47 S - 19.47 G - 6,12
      Q6011 D - 19.47 S - 19.47 G - 25.6

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