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Lenovo V155 15-API no display

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    #1

    Lenovo V155 15-API no display

    Hello guys,

    i have this laptop here that wont display.
    First thing i did was checking voltages and all are Present.

    After that i tried another ram sticks but they didnt change anything as well.
    Then i tried programming the bios with two different bios files but nothing changed (i used the ch341a without the 1.8v Adapter but I was able to read/write the chip).

    Now i thought it could be a ram issue.
    I flashed a bios with onboard ram disabled (dump attached) and i moved the resistors on the right Place like it's Show in the picture (attached).
    But nothing changed.
    The last thing i did is desoldering the ram Chips from the motherboard but the only thing changed is the current draw that went from 800-900milliamps to 370milliamps.

    What could be the fault here?
    Does it has anything to do with the bios chip? (W25Q64FW 1.8V)

    I have attached a Bios from Lenovos Website that was given to me in a Bios Request...Can someone disable the onboard ram in that bios for me?
    2 Photos
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    #2
    All laptop bios requests go here -> https://www.badcaps.net/forum/troubl...-requests-only
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    Comment

      #3
      You took steps in haste. The current draw indicates the mb is not recognising the external ram and still looking for onboard ram.

      There was no need to de solder onboard ram unless shorted.

      Comment

        #4
        Originally posted by mcplslg123 View Post
        You took steps in haste. The current draw indicates the mb is not recognising the external ram.
        But what did i do wrong?!
        I moved the resistors on place, diabled it in bios via ram patcher and desoldered the ram (thought it wouldnt recognize it anymore).
        Do i have to move another resistor?

        Comment

          #5
          SMDFlea does the ram patcher also removes the entrys for the dimm slot in some cases?

          Comment

            #6
            Originally posted by AppleLover123 View Post
            SMDFlea does the ram patcher also removes the entrys for the dimm slot in some cases?
            The ram patcher removes SPD entries in the bios. The ram that you put in the dimm slot has it`s own SPD on a small chip.
            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

            Comment

              #7
              Originally posted by AppleLover123 View Post

              But what did i do wrong?!
              I moved the resistors on place, diabled it in bios via ram patcher and desoldered the ram (thought it wouldnt recognize it anymore).
              Do i have to move another resistor?
              Desoldering the ram-this step was un necessary.

              Comment

                #8
                Originally posted by AppleLover123 View Post

                But what did i do wrong?!
                I moved the resistors on place, diabled it in bios via ram patcher and desoldered the ram (thought it wouldnt recognize it anymore).
                Do i have to move another resistor?
                Do you have a RAM slot tester or an Oscilloscope ?
                All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                Comment

                  #9
                  Originally posted by SMDFlea View Post

                  Do you have a RAM slot tester or an Oscilloscope ?
                  No, i don't have a ram slot tester but I can use a Oscilloscope from a friend.
                  Never did those measurements tough but I think i came to the conclusion that this Laptop may has a corrupt ec Firmware because of the fact that when the bios Chip is removed and i plug the charger it does exactly the same as with the bios chip and it doesn't read the power button.

                  I Ordered the Svod 4 with the zif sockets and it will arrive in about one week...

                  Comment

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