X1 Carbon Gen3 (20BT, 20BS) not turning on or no screen

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  • randoomkiller
    New Member
    • Oct 2021
    • 9
    • Hungary

    #1

    X1 Carbon Gen3 (20BT, 20BS) not turning on or no screen

    Hi, so I have the bestest of the best as the X1 Carbon 3rd gen (it should be 13268-1 from Wistron) and I have a few weird things on it and would be helpful if you could give a second opinion on it.

    First, for more than half a year now, the screen is (was) inhibiting the serial fault of having contact, so I'd have to apply pressure to the inverter to work.

    About 2 weeks ago I've spilled a little tea over the keyboard, then I turned it off, and did not do anything with it for a week. After that week I needed something that had webcam, but the keyboard was not accepting input, so I turned it off and taken apart since.

    I have been planning on upgrading the memory chips on it for a while now, because 8GB felt too little, and I felt like I would be up to the challenge, so I have the right kind (8pcs dual dye mikron 2GB/chip DDR3) as replacement.

    So, I thought while I get a new screen unit from ebay (because someone scrapped one, and put up a whole screen for 50EUR, which is a bargain), I would try to desolder the RAM chips.

    It did not work. It has underfill, that neither aceton nor alcohol can remove, however I've never encountered underfill before so it might have been possible that I was heat treating the Motherboard for 15-30 mins.

    Now the symptoms are : RED led is on when plugged in, it does seem to be charging the battery, however I see no screen at all.

    Another weird thing is that, whenever I turn it on, keyboard light is not visible, the power button shows to be on, HOWEVER even if I press it for a slight second it turns itself off. This is unusual, as usually to turn off you'd need 2-3sec, and the only time when I saw that it turned itself off like this was when it didn't have an SSD in it and told me an error code.

    No error code nor beeps were heard. No water damage is visible on the motherboard.

    My guess is that I've fried the old RAM chips, would that make similar symptoms?

    What do you think?


    P.S: I have also found a presumably "faulty" Motherboard on ebay for 8EUR of the same exact kind, and its on my way to here - it could be a good donor board. I also managed to get the schematics, both the boardview, and the PDF version.
  • randoomkiller
    New Member
    • Oct 2021
    • 9
    • Hungary

    #2
    Re: X1 Carbon Gen3 (20BT, 20BS) not turning on or no screen

    Could a killed RAM chip produce a dead machine or should I look for something else?

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