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820-3115-b board dont boot white led

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  • 820-3115-b board dont boot white led

    820-3115-b board, had slight water damage, all cleaned good now , now its turns on ...does not boot, white led keep on ,


    cpu vcore good,


    any idea , where to look

    pls chk picture

  • #2
    thats a hard drive, the problem will be on the logic board

    Comment


    • #3
      Originally posted by peterfixit View Post
      thats a hard drive, the problem will be on the logic board
      I think he is showing that the white LED is stuck ON.

      Comment


      • #4
        ah ok, have a look at the smc area

        Comment


        • #5
          USB mouse gets steady light?
          CPU VCORE drops from 1.15V to aprox 0.8V?
          Any reaction at AXG voltage?

          Comment


          • #6
            Originally posted by 2informaticos View Post
            USB mouse gets steady light?
            CPU VCORE drops from 1.15V to aprox 0.8V?
            Any reaction at AXG voltage?
            AXG voltage 0, cpu vcore does not drop ..... it keep on 1.15v


            uSB mouse didnt tried yet .... will update tomorrow

            Comment


            • #7
              remove the BIL to see if still turns on. any image on screen, shine light to screen?
              also SMC_LID value?

              Comment


              • #8
                No drop at VCORE, board is not functional; no need to check USB mouse.
                Check around SPI chip, for corroded resistors, traces.
                Don't forget R7403...

                Comment


                • #9
                  Originally posted by 2informaticos View Post
                  No drop at VCORE, board is not functional; no need to check USB mouse.
                  Check around SPI chip, for corroded resistors, traces.
                  Don't forget R7403...
                  ill chk tomorrow, thanks for quick reply

                  Comment


                  • #10
                    Did you check if the LED is ok?

                    Comment


                    • #11
                      usb mouse=no light ,

                      cpu vcore 1.12v,

                      aux cpu vcore....=0......


                      both ton register good, R7403 etc

                      Comment


                      • #12
                        Just for testing, swap the BIOS/SPI ROM chip from another 3115 onto this board. If it chimes, you have either bad BIOS or dead/faulty chip.

                        If you DO get a chime/boot, then load up a new BIOS with the original/correct serial number, MLB and a clean ME region. PRAM on 1st start.

                        If you DON'T get a chime/boot, then you can eliminate BIOS/SPI ROM chip as the cause, and replace the original chip back on the board.

                        Comment


                        • #13
                          Try ram slots one by one, Reseat Ram.ect

                          You have high v-core. It can be:
                          Ram not so good
                          SPI ROM
                          And often can be caused by a bad SMC.

                          Comment


                          • #14
                            Originally posted by SMMRepair View Post
                            Just for testing, swap the BIOS/SPI ROM chip from another 3115 onto this board. If it chimes, you have either bad BIOS or dead/faulty chip.

                            If you DO get a chime/boot, then load up a new BIOS with the original/correct serial number, MLB and a clean ME region. PRAM on 1st start.

                            If you DON'T get a chime/boot, then you can eliminate BIOS/SPI ROM chip as the cause, and replace the original chip back on the board.
                            did that , no boot/chime

                            Comment


                            • #15
                              here im posting some original water damage pic . b4 cleaning ....... pls chk the pic and let , know, i took out and thunderbolt chip and those is, those are good, also i put it back,

                              fan spinning high speed no, boot... which region i should chk first...spi chnged still the same, ......


                              cpu vcore good, 1.12v....

                              aux vcore 0v

                              Last edited by turbo; 03-21-2017, 07:19 PM.

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