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Modify RAM 2Go to 4Go for Lenovo S20-30

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    Modify RAM 2Go to 4Go for Lenovo S20-30

    Hi Room!

    I have a Lenovo S20-30 with 2GB RAM. I soldered a RAM on the motherboard (same reference as the original one) and unfortunately, the motherboard only detects 2GB.

    Should I modify the BIOS so that the system displays and detects the 4GB of RAM?

    Thanks in advance

    #2
    Re: Modify RAM 2Go to 4Go for Lenovo S20-30

    What are the part numbers of the old and new memory?

    Comment


      #3
      Re: Modify RAM 2Go to 4Go for Lenovo S20-30

      Thank's for your reply,

      Here is a picture of the reference

      D9PXV MICRON BGA
      Attached Files

      Comment


        #4
        Re: Modify RAM 2Go to 4Go for Lenovo S20-30

        On page 9 of the schematics, you need to configure the resistors for the new Micron memory, removing some and adding other resistors for the SDRAM configuration.

        Comment


          #5
          Re: Modify RAM 2Go to 4Go for Lenovo S20-30

          I didn't see it!

          I will do it tomorrow and come back here for the result

          Thanks for the info

          Comment


            #6
            Re: Modify RAM 2Go to 4Go for Lenovo S20-30

            Here is a screenshot of the area for GPIO
            When I move the R286 to R284 it does not work. The PC starts but no image.
            Could you help me if there is another combination?
            Attached Files

            Comment


              #7
              Re: Modify RAM 2Go to 4Go for Lenovo S20-30

              I think you should take R294 out and put it at R293.

              Comment


                #8
                Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                ...still the same

                Comment


                  #9
                  Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                  If you put the resistors back as they were before changing the memories. What happens afterwards?

                  Comment


                    #10
                    Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                    If i put the resistors back, it work's fine but just with 2Go of RAM

                    Comment


                      #11
                      Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                      https://fr.aliexpress.com/item/40000...yAdapt=glo2fra

                      I found on Aliexpress a motherboard with 4Go of RAM (Samsung RAM chip)

                      Comment


                        #12
                        Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                        You have 8 circuits for memory, U5 U6 U8 U9 U72 U73 U74 U75. Originally which circuits were present and which were added.

                        Comment


                          #13
                          Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                          U5 U6 U8 and U9 was the original
                          U72 U73 U74 and U75 was added

                          Thanks for your reply
                          Attached Files

                          Comment


                            #14
                            Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                            Check r416 , a photo effect or a problem ?
                            Attached Files

                            Comment


                              #15
                              Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                              The resistor is ok, 0.245K ohm
                              No short anywhere detected. it works fine when the RAM is in single chanel

                              I used this RAM to pick up the chips
                              Attached Files

                              Comment


                                #16
                                Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                                at this point one of the new chips may be damaged. personally even if the work is so much I would try to replace the working chips (old 2g), one at a time, with the new ones and see if it displays (with 2g cdefault conf)

                                Comment


                                  #17
                                  Re: Modify RAM 2Go to 4Go for Lenovo S20-30

                                  That's exactly what I thought and we'll see what happens

                                  Comment

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