i have 2 Huawei Matebook D14 NBB-WAH9Q with the same fault (errors on RAM chips)

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  • Bartoloni
    Senior Member
    • Jul 2018
    • 140
    • Italy

    #1

    i have 2 Huawei Matebook D14 NBB-WAH9Q with the same fault (errors on RAM chips)

    looking at the motherboard there are 2 different sets of 4chip ram ( 4+4 ) and seems 2 different BANKS...
    disabling 1 of the bank can solve the issue )leaving the laptop with only 4gb .. but working)

    tried to find schematics but i have found nothing.
    also no youtube video about this fault ( strange... 2 units with the same problem .. i was thinking is a common fault like RAM on ASUS X550)

    any hints?
    thank you in advance.

    the board is DAH98NMB8C0 rev C HF
    Last edited by Bartoloni; 08-07-2024, 06:50 AM.
  • Bartoloni
    Senior Member
    • Jul 2018
    • 140
    • Italy

    #2
    for who is interested here 2 photos, the error is at address 235c000..etc.. (and maximum address available is 261f000...etc) , so i think that is failing the 8th chip... anyone can spot where is the 8th ? (or can be the 7th?)

    Comment

    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France

      #3
      Sadly that's not how RAM addressing works. See my answer for a similar case here. https://www.badcaps.net/forum/troubl...33#post3284033
      Anyway, without schematics or boardview it'd be very difficult to figure out how the RAM ICs are connected.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

      • Bartoloni
        Senior Member
        • Jul 2018
        • 140
        • Italy

        #4
        yesterday i reflowed the 2 chip on one side and the other 2 at the opposite side.. the error disappeared... now i'm testing the PC (that reach a very high temperature on CPU...) for some days

        Comment

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