Thinkpad X280 NM-B521 No Power

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  • Stachujones
    Member
    • Jul 2023
    • 15
    • Poland
    #1

    Thinkpad X280 NM-B521 No Power

    Hello i have a problem with a ThinkPad X280 with NM-B521 Motherboard, laptop doesnt power on
    I dissasembled IT and started Basic trouble shooting
    +20v is getting to board so power delivery circuit is working
    Next i started looking on the board and i felt a burning hot chip its BD4179 "ThinkEngine"
    I desoldered it, no more chips are getting hot
    But i founded that on the capacitor marked on the picture there is 0.8 ohm short to ground and it's not capacitor, after desoldering it it's Still 0.8 short

    Could anybody help me with fixing this laptop
    Thanks a lot!
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