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[SOLVED]A1398 820-3662 liquid spilled, restored power but no post.

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  • [SOLVED]A1398 820-3662 liquid spilled, restored power but no post.

    Having this 820-3662 board. liquid spilled around led connector, u7501 area.

    no power.
    fixed u7501 area, and power on,fan spins. but no video.( no chime sound)

    check back light circuit,nothing on l8300.

    checked CPU vcore and it's there.

    connector got replaced with new one already.

    any advice?

  • #2
    USB mouse lighting up?

    Comment


    • #3
      sorry for a delayed reply, been busy on other boards.

      YES, plug in usb mouse and it does light up

      Comment


      • #4
        Do a PRAM reset and check for chime.

        Comment


        • #5
          tried that already,but no luck

          Comment


          • #6
            Got CPU Vcore, L7310?

            Comment


            • #7
              yes it's there , i checked L7310 L7320 L7330 all have voltages

              Comment


              • #8
                is this no backlight or no display?

                Comment


                • #9
                  Using a known good LCD? Tried external video?

                  Comment


                  • #10
                    yes both , no video at all. not back light issue.
                    Checked with a DC power supply,compare with good board.

                    good board should jump from 0.01 to 1.4 AMP after boot up.
                    this one only goes to 0.4A then stop, looks like some voltage is not coming out, but checked all big coil , they all exist already. even CPU vcore comes out already.

                    Comment


                    • #11
                      Pretty much out of options here. Check closely for more corrosion again, especially U6100, clock, U1950, SMC. If all ok then could still be dead CPU.

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                      • #12
                        I poled around and compared with the good board, found one thing can be the hint.

                        diode mode on pp3v3_s0, only gets 0.035
                        the good one is around 0.319

                        but when powers on, pp3v3_s0 is 3.3v still , doesn't look like pulling down. something shorted?

                        Comment


                        • #13
                          That is indeed way too low. That is also a rail that has pretty much everything connected to it. Maybe inject 3V there and see if anything warms up.

                          Comment


                          • #14
                            removed r7640, diode mode 0 on its pin 1.

                            damn.turn out to be one of the shits I never wanted to do. it's a dead PCH.

                            it's SR17D,having one last piece here, will do the BGA replacement and update back

                            Comment


                            • #15
                              HAHA, it's my lucky day. replaced the PCH, power up and took a while to post.

                              knowing it's the ME issue, flashed the bios with cleaned me file. all boots up and works now!!

                              thanks for the advice guys!

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