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Lenovo X1 Carbon, 7th Gen no Display!

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    Lenovo X1 Carbon, 7th Gen no Display!

    Hello,
    I have a problem with the device mentioned above. It starts but shows no display, although the device works perfectly via an external monitor. The display itself also works because the self-test shows all colors. All fuses seem to be OK, Vsys18 is also 12.24V. Has anyone successfully repaired a case like this? If necessary, I would post schematic and boardview.
    Thanks.

    Lenovo Thinkpad X1 Carbon: Intel I7, Type 20QE-SAY601
    S/N: PF-1W6Z7X
    Boardnr: FX490 NM-B861
    Last edited by Ariu; 12-07-2024, 01:33 PM.

    #2
    i double checked now and for me seems to be VSYS18 to low(12,24V) VSYS18 muss be at least the battery voltage when depleted (15,4V) or not? i dont know if the charging circuit is working because the battery is faulty.
    is it possible that a faulty charging ic bq25700 or mosfet Q282 may cause the blank screen, because that signal vsys18 to the screen connector is coming from there ?

    https://www.badcaps.net/forum/troubl...-fx490-nm-b861
    Last edited by Ariu; 12-07-2024, 04:03 PM.

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      #3
      According to the Lenovo diagnostic app, the notebook has an error with the integrated graphics (0286 error), can anyone confirm that this is a known error for this model? is there a possible fix?

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        #4
        Are you saying you are getting perfect output on an external monitor but not on the internal monitor? Do you get bios screen (non graphic) ?

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          #5
          VSYS18 at 12.2V is correct as charging ic is NVDC type.
          Since you have external display,measure voltage on EDP pins.

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