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Apple MacBook 12" A1534 820-00045 usb problem

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    Apple MacBook 12" A1534 820-00045 usb problem

    Hi. Got this macbook faulty (dead) . Managed to find the short on u4700 part number SLG4AP645AV
    Replaced it and now macbook powers on and works ,charges battery fine
    Now the problem is that only 5v is the voltage and not busting to 20v. When plugin external usb it comes with a port disabled as crowing to much power.
    Any ideas ?
    Thank you
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