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820-3115 must short power pads

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  • #16
    All of them appear unconnected in the boardview...

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    • #17
      reballed SMC same behaviour:
      sometimes quater fan spin and everything pulses or no quater fan spin but I have to short the pads to have the pulse and quarter fan spin after what I'm loosing S5 state because of No SMC_PM_G2_EN.
      In that "mode" the battery is not charging because CHGR_BGATE is high.
      If not it is charging and I have activity on SDA and SCL lines
      Re-writed EFI U6100 SMC with a fresh clean dump in which I've injected the Serial into it and did a checksum CRC with the medusa: same issue.

      I have to admit that I'm out of idea ......any clue?

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      • #18
        SMC_PM_G2_EN signal lost after reballed SMC?
        Change SMC now and inspect traces and pads under SMC, ones removed.
        Also check for knocked off components.

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        • #19
          Hi 2 Informaticos,

          SMC_PM_G2_EN is present but it's disapearing after quarter fan spin or power pads being pressed....so I follwed the signal up to SMC and SMC_PM_G2_EN.
          Question: Is there any signal/rail upstream before SMC that triggers the SMC_PM_G2_EN? in other words what signal, the SMC needs to generate SMC_PM_G2_EN?

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          • #20
            Looks like SMC detects a problem and pull down the signal, to block the 3V3_S5 power supply.
            Try starting in SMC bypass mode first.

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            • #21
              already did it : fan at full speed but just like a pulse: same like in normal mode......I will reflow U1800 in case of crap under it

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              • #22
                after U1800 reflow , the board is now turning ON during 15 seconds then stops........
                I don't remember if I already passed it in the UC.......I think that it will take a bath in the UC......
                I'll let you know thanks

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                • #23
                  Hi ,
                  Passed that board in the UC, and the board started few times but without PPVCORE_S0_AXG_R but PPVCORE_S0_CPU_PH1 and PPVCORE_S0_CPU_PH2 were present.

                  finally the board started to act like before: quarter fan spin.....
                  I will reflow U1800 again and see

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                  • #24
                    AXG voltage appears if you open Youtube, or a graphic application.
                    If you get VCORE after UC, should be problem generated by crap under BGA chips.
                    Reflow SMC, PCH and CPU with good flux; or use IR oven for entire board.
                    Test it and clean again on UC...

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                    • #25
                      That's exactly my idea: to bring it to someone who has an IR reflow machine for BGAs.....will see

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                      • #26
                        The board is starting after a PCH reflow but here are the issues I've noticed after reassembled everything together:

                        Very slow to load OS even on external SSD
                        Self Shutting down if the wifi card is plugged in, or stays ON if 4 antenna cables disconnected but shuts down when connecting to network
                        Fan runs at full speed
                        J3100 Slot make the computer beeps 3 times if any ram memory inserted in it.

                        Did SMC reset many times: NOK
                        Checked wifi card: No corrosion and clean
                        installed Mac Fan Control and checked Temps: PCH is at 50°C when PCU is at 33°C

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                        • #27
                          Did you run ASD EFI?
                          Is the original BIOS of the board?

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                          • #28
                            Did you run ASD EFI?
                            Not Yet

                            Is the original BIOS of the board?
                            No, as the board was doing quarter fan spin those past weeks, I've decided to write another one and cleaned ME and rewrited the SN with the medusa......
                            But thta's right, as the board is now turning ON, I can piut back the original dumped bios......

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                            • #29
                              Hi 2Informaticos,

                              I've run ASD, this one went alsmost to the end ( Memory 62 Test ) but the board turned OFF approximatively 15 mins running with Fan at full speed.
                              In the mean time ASD poped up with PBUS Voltage Sense & Enable (VP0R) in red claiming that the PBus voltage was under the lower limit.
                              Once it shuts itself down, the board pulls 0.030A, After what the board doesn't start itself when I plug the charger, I have to press the Power button, but unfortuantrly it stays ON only few seconds.
                              but If I let it for long time not connected ( like all caps are discharged ) and replug the charger, it will turn ON it self.
                              I've noticed that the board is getting hot on the opposite side of C7540 C7561 area: which is Q7510 Q7520 area and related to CPU High Side Current Sense (IC0R) and PPVIN_S5_HS_COMPUTING_ISNS.
                              What do you think?

                              ASD.jpg

                              Last edited by Bouba148; 10-06-2019, 05:02 PM.

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                              • #30
                                Post SMC_PBUS_VSENSE level.

                                Is normal that CPU power supply area gets hot when working.

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