820-00840-A HDD PROBLEM

[tipoti]

device turns into question mark after a certain time . I installed a different m2 SSD and reinstalled macos. After a certain time, the question mark appeared again. I wired L8600 to try, the result did not change

 

[2informaticos]

If using original SSD, bypass L8602 too.
Some M2 adapters also use PPBUS_G3H.

Write down voltage level on pins 4-13 in working state, and compare with the values when the problem appears.

 

[tipoti]

L8602 I bypassed it same

while working

pin 4 : 0.012 Voltage
Pin 13 : 3.2 Voltage
R8621 pin 1: 3.3v pin 2 : 3.2v


when not working

pin4 :0.009 Voltage
Pin 13 : 3.2 Voltage
R8621 pin 1: 3.3v pin 2 : 3.2v

 

[2informaticos]

4-13 means ALL from 4 until 13.
4/13 means 4 and 13...

 

[tipoti]

Sorry

I noticed that the problem of detecting the disk does not occur when the charger is connected. But now it won't turn on when the battery is plugged in. After the device is turned on, I plug the battery flex, sometimes it draws 0.60 and sometimes 1.98 Amps. It says Battery is not charging. I ordered a new battery and will try it when it arrives. If the battery is faulty, can it cause the problem of not seeing the ssd? How can I be sure until the battery arrives? Is the problem in the battery or the motherboard?
Note: The original charger is broken. It charges once, then it doesn't, it's in a continuous loop.

SCL: 0.429
SDA: 0.429
R6950: 9.92K

pin 4 : 0.012 Voltage
pin5 : No voltage
pin6: 1.78 Voltage
pin7: 3.2 Voltage
pin8: No Voltage
pin9: 3.4 Voltage
pin10: 3.2 Voltage
pin11: 3.3 Voltage
pin12: 3.2 Voltage
Pin 13 : 3.2 Voltage
R8621 pin 1: 3.3v pin 2 : 3.2v


when not working

pin4 :0.009 Voltage
pin5 : No voltage
pin6: 1.77 Voltage
pin7: 3.2 Voltage
pin8: No Voltage
pin9: 3.4 Voltage
pin10: 3.2 Voltage
pin11:
pin12:
Pin 13 : 3.2 Voltage
R8621 pin 1: 3.3v pin 2 : 3.2v

 

[2informaticos]

If all signals have the same values, then should be a communication problem.

 

[tipoti]

so what should i do

 

[2informaticos]

If SSD and connector are in good working condition, there may be a problem with PCH.
I'm not sure if is worth to change the CPU on this machine.