820-02016-07 [Macbook Air m1 2020 A2337 EMC3598] 5.07V 0.00A NO POWER NO CHARGE

[D@nt3s_1nfern0]

Hi there guys. This is my first post on this forum and my first attemp to fix a problematic board. Ill give you a litle pre history of the device. The Macbook was powering on but it wasnt charging (it was showing an X sign on the battery icon) i went to my local apple authorised repair centre and they told me that they tried with a new battery and charging port but the issue was still there so they said its a board issue. The laptop belongs to my partner and she already ordered a new one but she considers the data gone on this one. I want to try my best to fix it and surprise her. The laptop at first with a usb meter it was taking the 20v and around 0.02-5A. i tried to diagnose the issue. But now the laptop only takes 5.0v and 0.0A. here is some information i was able to find out. I would appreciate if someone could help me fix it.

PPBUS_AON voltage = 12.30v (measurement was taken from C5960)
PP3v8_AON_VDDMAIN = 0.735V (measurement was taken from C5887)

CD3217 support voltages

PP5v_S2 = missing (measurement was taken from CC335)
PP3v3_S2_UPC = 0.069V (measurement was taken from CF400)
PP1v25_S2 = missing (measurement was taken from Pin 1 SWV011)

PPDCIN_AON_GHGR_R is making it to the ISL9240 with a voltage of 5v which is the same voltage i see on the usb amp meter
also the 4 resistors (R5221, R5222, R5261, R5262) around the ISL9240 are all at 1.0Ω
**one of them had a wrong reading and i replaced it.

these are all the info i could diagnose but i dont know where to go from here. Thank you all in advance. I am really excited to try to fix the laptop and learn as much as i can.

Thank you very much.

[mon2]

PP3v8_AON_VDDMAIN = 0.735V (measurement was taken from C5887)

Remove all power. Meter in resistance mode. Measure the resistance to ground of PP3v8_AON_VDDMAIN. What is the resistance in OHMS?

[D@nt3s_1nfern0]

Remove all power. Meter in resistance mode. Measure the resistance to ground of PP3v8_AON_VDDMAIN. What is the resistance in OHMS?

Probably stupid question. But do i put black probe on ground and red probe on the possitive side of C5887 correct?

[mon2]

In resistance mode, the color of the probes do not matter.

The color of the probes do matter if measuring DC voltage, DIODE mode testing as there are polarities involved.

[D@nt3s_1nfern0]

In resistance mode, the color of the probes do not matter.

The color of the probes do matter if measuring DC voltage, DIODE mode testing as there are polarities involved.

ok so on the ground side of C5887 i get 000.4Ω and on the other side of the CAP the value started at 5MΩ and keeps on decreasing now its around 0.775MΩ.

I dont think i got the measurement right

[mon2]

No short circuit here as the resistance is high.

Carefully measure the voltage to ground of P3V8AON_PWR_EN which is created by U5340.

If this voltage is low, then carefully measure the voltage to ground of PPCHGR_VDDA as used by U5340 for its power. That is, we are checking if this buffer IC is being powered or not. You can measure on C5341 with a steady hand.

If the chip is being powered, test the voltage to ground of C5340 (CHGR_EN_MVR_DLY).

For these DC voltages, configure your meter to 10v or higher if you have a manual meter. If automatic, do not bother but configure for DC volts mode.

Red meter probe to the point to test; black meter probe to ground (metal shield is ok). Be sure your meter probes are sharp enough to measure these tiny parts else stop till you have the proper probes.

[D@nt3s_1nfern0]

P3V8AON_PWR_EN = 5.118v (measurement taken from R5341)
PPCHGR_VDDA = 5.117v (measurement taken from C5341)
CHGR_EN_MVR_DLY = 5.015v (measurement taken from C5340)

[mon2]

These are good measurements and means the logic board is attempting to enable this key power rail yet the power rail is low and is not shorted.

Review this webpage for low or missing rail which appears to be your case:

https://repair.wiki/w/MacBook_Air_A2...w_at_5V_repair


PP3v8_AON_VDDMAIN low or missing

• Check for a short to ground on PP3v8_AON_VDDMAIN (normal diode mode to ground reading ≈ 0.350).
• If a short to ground is found, replace the shorted component.
• Check the enable signal to U5700 (Figure 8), P3V8_PWR_EN, and address any issues with U5340 (Figure 9) or surrounding components.
  • P3V8_PWR_EN is sourced from CHGR_EN_MVR from the ISL9240 (U5200) and passes through a delay switch (U5340) where it is outputted as P3V8_PWR_EN.
  • If P3V8_PWR_EN is missing, check voltage on R5340 (CHGR_EN_MVR). If CHGR_EN_MVR is missing, replace U5200.
  • If CHGR_EN_MVR is present, but P3V8_PWR_EN is missing, potential faults could include U5340, or surrounding traces/resistors.
• Ensure VIN (PPBUS_AON) is making it to U5700; Occasionally a via or trace can break resulting in a voltage not making it to some parts of the board. PPBUS_AON can be measured adjacent to U5700, on C5704 or C5804.
• If the above findings are negative, replace U5700

[D@nt3s_1nfern0]

These are good measurements and means the logic board is attempting to enable this key power rail yet the power rail is low and is not shorted.

Review this webpage for low or missing rail which appears to be your case:

https://repair.wiki/w/MacBook_Air_A2...w_at_5V_repair


PP3v8_AON_VDDMAIN low or missing

• Check for a short to ground on PP3v8_AON_VDDMAIN (normal diode mode to ground reading ≈ 0.350).
• If a short to ground is found, replace the shorted component.
• Check the enable signal to U5700 (Figure 8), P3V8_PWR_EN, and address any issues with U5340 (Figure 9) or surrounding components.
  • P3V8_PWR_EN is sourced from CHGR_EN_MVR from the ISL9240 (U5200) and passes through a delay switch (U5340) where it is outputted as P3V8_PWR_EN.
  • If P3V8_PWR_EN is missing, check voltage on R5340 (CHGR_EN_MVR). If CHGR_EN_MVR is missing, replace U5200.
  • If CHGR_EN_MVR is present, but P3V8_PWR_EN is missing, potential faults could include U5340, or surrounding traces/resistors.
• Ensure VIN (PPBUS_AON) is making it to U5700; Occasionally a via or trace can break resulting in a voltage not making it to some parts of the board. PPBUS_AON can be measured adjacent to U5700, on C5704 or C5804.
• If the above findings are negative, replace U5700

Thank you for your reply. During the measuring of PPBUS_AON on C5704 I managed to burn the U5700 and now the whole line is shorted to the ground. i already ordered a replacement but it will arrive next month.

[D@nt3s_1nfern0]

These are good measurements and means the logic board is attempting to enable this key power rail yet the power rail is low and is not shorted.

Review this webpage for low or missing rail which appears to be your case:

https://repair.wiki/w/MacBook_Air_A2...w_at_5V_repair


PP3v8_AON_VDDMAIN low or missing

• Check for a short to ground on PP3v8_AON_VDDMAIN (normal diode mode to ground reading ≈ 0.350).
• If a short to ground is found, replace the shorted component.
• Check the enable signal to U5700 (Figure 8), P3V8_PWR_EN, and address any issues with U5340 (Figure 9) or surrounding components.
  • P3V8_PWR_EN is sourced from CHGR_EN_MVR from the ISL9240 (U5200) and passes through a delay switch (U5340) where it is outputted as P3V8_PWR_EN.
  • If P3V8_PWR_EN is missing, check voltage on R5340 (CHGR_EN_MVR). If CHGR_EN_MVR is missing, replace U5200.
  • If CHGR_EN_MVR is present, but P3V8_PWR_EN is missing, potential faults could include U5340, or surrounding traces/resistors.
• Ensure VIN (PPBUS_AON) is making it to U5700; Occasionally a via or trace can break resulting in a voltage not making it to some parts of the board. PPBUS_AON can be measured adjacent to U5700, on C5704 or C5804.
• If the above findings are negative, replace U5700

Ok so i did receive the U5700 replaced it and the short is gone.

PP3v8_AON_VDDMAIN = 0.358v on diode mode
P3V8AON_PWR_EN = i measured the R5710 and i do get 5.10v on both sides. so i believe that the signal does reach, correct?
PPBUS_AON = 11.9v (measurement taken from C5804) is that the correct voltage?

sorry for the delay of the answer.

Looking forward for your reply.