W540 - black screen and turning on for a moment

Discussion in 'Computer Hardware Repair' started by 05ifix, Aug 1, 2018.

  1. 05ifix

    05ifix Moderator

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    I welcome all good people in this forum :)


    I have a problem with repairing Lenovo motherboards. W540 LKM-1 WS MB 12291
    I have 4 pieces of W540 motherboard - they all have the same symptom.

    - motherboard is switched on for a moment but the screen is black.
    - if the battery is inserted, the plate switches on for a moment but the logo appears on the screen
    - Consumption 2A

    I was programming different bios, I was cleaning the region
    DC and BAT input transistors - good

    I do not have a schematic for this model, maybe you have a similar one?

    Is it necessary to program the MEC ?? by programming a new bios? Is this connected to each other in the

    same way as BIOS and EC?


    I am asking for directions what else to check
     
    #1 05ifix, Aug 1, 2018
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  2. Maz_Lab

    Maz_Lab Well-Known Member

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    Change Adapter for 20 V 8A
     
    #2 Maz_Lab, Jun 13, 2019
  3. 41ifix

    41ifix Well-Known Member

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    Bq24780?
     
    #3 41ifix, Jun 17, 2019
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