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    MacBook Air A2337 / Boot Failure

    It does not go to disk target mode. I have tried a lot. Do you know what the apple authorized workshop has that we don't have that they can recover data in DFU mode? Also we are not owner of the laptop. Can we still take it there? Will they do data recovery?
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    MacBook Air A2179 / 20V 0.05A

    We soldered to wires to the mainboard. We plan to assemble the laptop and try to turn on it by shorting the cables. Is this correct? We need advice here.
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    MacBook Air A2337 / Boot Failure

    Hi there, We have a MacBook that does not boot correctly. It says The version on the macOS on the selected disk needs to be reinstalled. We need to get the data off form the MacBook before erasing it. The thing is whatever we do on that MacBook the pink screens flashes once and the MacBook...
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    MacBook Air A2179 / 20V 0.05A

    I am trying to connect external switch to force DFU mode. Reading logi.wiki web page. So my board is A2179 and it says I should connect the wires to between pin 1/R8010 to pin 1/C7845, or other convenient 1V8_SLPS2R point. I want to get confirmation that I am doing correctly. Basically we want...
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    A1932 keeps Restarting

    https://logi.wiki/index.php/DFU_Mode_Restore_(Macs)#DFU_Mode_using_external_switch I found this.
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    MacBook Air A2179 / 20V 0.05A

    I don't know how to do it. Can you please guide me?
  7. Z

    MacBook Air A2179 / 20V 0.05A

    Hi, The Apple Configurator doesn't detect the Logic Board. What should we do next? Thank you
  8. Z

    MacBook Air A2179 / 20V 0.05A

    Sorry for that. See power signals as requested. 3V_G3S --> 3.3v 1V8_G3S --> 1.8v 5V_G3S --> 5.1v
  9. Z

    MacBook Air A2179 / 20V 0.05A

    All the same P1V8G3S_EN --> 1.8v P3V3G3S_EN --> 1.8v P5VG3S_EN --> 1.8v
  10. Z

    MacBook Air A2179 / 20V 0.05A

    Here are the readings: P3V3G3S_EN --> 1.8v PPVIN_G3H_P3V3G3H --> 12.6v PP3V3_G3H_RTC_R --> 3.2v PPVCC_NAND_SSD0 --> 2.5v What do you think?
  11. Z

    MacBook Air A2179 / 20V 0.05A

    Hi there, We have MacBook Air A2179 doesn't charge and turn on at all. We removed Logic Board from laptop and inspected under the microscope. Looks like there is no visible damage. We checked all port using a USB-C meter. The laptop is stuck on 20v and 0.05 ampere. I need your help in this...
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    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    Hi, So voltage injection helped. We found shorted capacitor on the Logic Board. We removed and MacBook works fine. Thank you for your help.
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    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    inserting 1V means I will connect 1V lab DC power supply to the F5200:2 point and ground line to the ground point on board. Can you tell me how to find it? Using thermal camera? I need your guidance at this step. Thank you.
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    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    Hi. Here are the measurement. What do you think about them? LN480 - 0.31 kohm LN980 - we dont have this could on the board L5230 - 0.55 Mohm L5840 - 0.49 kohm L5820 - 0.31 Mohm L5800 - 0.25 Mohm LF800 - 0.30 kohm LP800 - 0.23 Mohm
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    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    Resistance is 0.25 MegaOhm between ground and F5200:1 points. Resistance is 0.11 Ohm between ground and F5200:2 points.
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    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    We checked C5251 and C5250 capacitors. There is voltage. Yes you are right. Short remains on PPBUS_AON. But there are many elements. How do we proceed to find the next issue. Thank you.
  17. Z

    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    So we removed both F5200/01 from the board. Checked C5200 and C5201 first leg and both of them shows 12.3 vdc. What should we do next? Looks like there is short somewhere. Please advise how to proceed next. Thank you
  18. Z

    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    I did not know there is 138C solder paste. I just ordered and I will have it tomorrow. Thank you for helping me. I will not write any voltage unit when I measure for diode mode when. Pure short is the problem. It should not be pure short. So I will remove F5200 and check C5200, post it here...
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    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    Diode mode to ground is missing as well. It shows 0.0001 mvdc for PPBUS_AON and 0.3 mvdc for 3V8_AON. I put the multimeter on diode mode, put the red on ground and black on element. Also we tried to remove F5200 from the board but 420C hot air cannot remote it. It does not get melted. It...
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    Apple MacBook Pro A2442 / 820-02443 / 5.21V 0.03A

    Yes the same behavior on Magsafe 3 port. Voltages for PPBUS_AON and 3V8_AON missing. Please advise what to check next? thank you
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