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  1. Ictc

    820-01521-A

    Resistance to ground measured on L7410, L7430, L7210, L7230 is respectively 14, 14, 20,5, 20,5
  2. Ictc

    820-01521-A

    I agree but I tought you could have helped me at least in order to get to a diagnose without these tools, I'm not talking about solving the issue right now but at least know what sould be the fault responsable of the issue. If I should blame cpu/pch or BIOS/T2 chip. I do not know if the DFU was...
  3. Ictc

    820-01521-A

    Ok how do I know if the problem is with the BIOS/T2 or elsewhere? I tried restoring the T2 as I told you before resulting in just a padlock symbol and nothing else at the end of the process. I tought there could be something more straightforward to narrow down the issue.
  4. Ictc

    820-01521-A

    Sure I'll do it but need your suggeasions about what to test next. I arrived at the point that s0 state should already be reached and I wonder why still not powering up. What should I measure to get a clear picture of what is working and what is not? Cpu/pch? How do I know for sure?
  5. Ictc

    820-01521-A

    No, I didn't connect the battery during tests. I'll do it but I need to know if the problem could arise in CPU area or somewhere else in the motherboard.
  6. Ictc

    820-01521-A

    How do I find out what is the missing signal or bad components that prevents the machin to power up ? I guess if U3900 could be the cause. What other signals should I check for in order to narrow down the search to the required ones for booting at least?
  7. Ictc

    820-01521-A

    SMC_PCH_PWROK also 1,8V
  8. Ictc

    820-01521-A

    I wonder if I get ALL_SYS_PWRGD_R I should also have PP1V8_S3, PP5V_S3, PP1V2_S3, PP1V05_S0, PP5V_S0, PP3V3_S0, PP1V5_S0, etc... Am I right?
  9. Ictc

    820-01521-A

    Found 0,9v on L8102 No voltages on L7410, L7430, L7210, L7230 cpu get warm
  10. Ictc

    820-01521-A

    Sure, I'll let you know when I'll get back to work tomorrow.
  11. Ictc

    820-01521-A

    Something is preventing the board to go to s0. Ram voltage also ok
  12. Ictc

    820-01521-A

    PM_SLP_S3_L allready measured... 3.3v stable
  13. Ictc

    820-01521-A

    PM_SLP_S4_L solid 3.3 PM_RSMRST_L two seconds after enabling power goes to 3.3 stable no pulse
  14. Ictc

    820-01521-A

    Once I press PWRBTN pch_pwrbtn_L goes low. That means PHC knows at least that have been triggered to power on. What next?
  15. Ictc

    820-01521-A

    No other hints? Should I reallly let the customer bring this machine to Apple for a mobo swap?
  16. Ictc

    820-01521-A

    by the way is it normal that in configurator 2 the macbook air is recognized as an Apple Controller? Just performed a new restore ended up with another padlock symbol ...???
  17. Ictc

    820-01521-A

    yes solid 5v on L7670 and 3.3 V on L7690. Get also 12V on L7030 with no battery and when battery connected decreasing 4,5V during charge (charging normally I assume...) The customer said she previously nstalled Big Sur, may be the issue came after a furture update of the os? She also brig it to...
  18. Ictc

    820-01521-A

    Sorry, didn't get a clear picture from the customer. "Suddenly It just stopped to boot...". I entered DFU, tried revive, no change, than tried a restore (they have a data backup...) finished with a big padlock symbol on the configurator 2 window which I definately ignore the meaning of (is it...
  19. Ictc

    820-01521-A

    Sorry for the worts explanatory title ... forgot to edit before post it...
  20. Ictc

    820-01521-A

    Got this machine that doesn't boot up but charges the battery. Non liquid spills at all, the board look very good. I get 20v on both usb C adapter voltmeter and most of the power rails seems to be solid except for the cpu s0 related power rails... CPU heatsink gets little bit warm but pressing...
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