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No power, no charge - Acer Nitro 5, AN515-56

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    No power, no charge - Acer Nitro 5, AN515-56

    Hello friends of naughty electronics
    Can I ask you for a little help or advice with motherboard diagnostics, more precisely with the MB of the Acer Nitro 5 laptop, AN-515-56-5057 (i5-11300Hh, GTX1650), GH52T LA-L051P Rev. 1A
    I was looking for a schematic for this board, but couldn't find an identical one.
    NB with the board it cannot be turned on and does not charge.
    After connecting the charger, the voltage on the first and second mosfet is 19.6V. The situation is different on other mosfets in the main rail - 19.6V; 0.21V and 0V.
    It is also short on some inductors (but not all). For example, the 3.3V rail seems to be OK - 3.3V voltage is present on the BIOS chip, 5V is also measurable.
    I've been playing with this board for a while now, but I can't seem to figure out where the problem is.
    Thank you very much for the help, ideas or kicks to find the error.
    (photos with a description of the measured values attached).
    Attached Files

    #2
    Re: No power, no charge - Acer Nitro 5, AN515-56

    Measure resistance to GND on all coils on ohms mode. Your dc-in circuit is fine and i think battery is charging-confirm its true or not. Presence of 3V/5V means the board is having atleast some form of life.

    Look for corrosion and try to locate dc-dc converter for 3/5V ALW to 3/5V VS. Measure resistance to GND on input/output pins. Usually they are 14 PIN IC with 7 legs on each side. Pin1 & 7 should be input/8 &14 may be output.

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