Lenovo NM-B891 (X390/T490 etc..) failed PU1001

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  • TheDJVG
    New Member
    • Jun 2024
    • 6
    • Singapore
    #1

    Lenovo NM-B891 (X390/T490 etc..) failed PU1001

    Hi everyone!

    Got a Lenovo X390 with a NM-B891 motherboard. When USB-C connected it negotiates 12v without any problems but no current is drawn. Inspection of the board shows this failed component:

    Based on the boardview I was able to find this is a MP86901. I've removed this component and cleared the pads.

    Connecting the charger again shows no improvement (12v, no current).

    Resistence around this component (near the CPU) measure around 2.1 and 3 Ohm, probably acceptable for the location of the components being CPU related?

    So far the only location I've been able to read less than 1Ohm is around PL0501:
    Click image for larger version Name: image.png Views: 228 Size: 121.6 KB ID: 3299460​
    PC0511/PC0509/PJ0502 all read ~0.3Ohm (probably my leads). PC0512 seems to be ok.

    Component around it seem to be fine. Tried removing PC0511/PC0509 but resistance kept low.

    Photo of the area:
    Click image for larger version Name: photo_2024-06-30_12-13-01.jpg Views: 195 Size: 305.5 KB ID: 3299461

    Any ideas on what to check or if this is a known failure with this board?


    Thanks everyone for help and insights!
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