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Acer CB3-431 Chromebook - Motherboard Diagnostic

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    Acer CB3-431 Chromebook - Motherboard Diagnostic

    Hi All,
    I have an Acer Chromebook which does not power on, no LEDs with chBeing arger plugged in, no joy with attempt at hard reset.
    I have tested the charger at 19v but when checking the Power Jack that connects to the motherboard, I only get about 0.18v from the output connectors. So I replaced the short power jack connector.
    I now get exactly the same as before..

    Thing is, i've noticed that I can check the charger cable at 19v, pluf into the disconnected power jack assembly and get 19v at the output connector.
    However, as soon as I plug the connector into the motherboard the reading drops straight away back to 0.18v. I then get the 0.18v reading on everything back up the chain including the AC Charger itself.
    To get back to 19v I need to disconnect the Charger from the source and then try again.

    I'm a bit of a novice when it comes down to troubleshooting boards themselves, so as wondering if this is due to an error on the mainboard that will happen until identified ?
    I cannot see any scorch marks or telltale burns anywhere on mother or daughter boards so am a bit stuck.

    Hoping someone can guide me on my next steps..

    All help greatly appreciated..
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