Hi,
This board will randomly crash when the cable at J6951 is connected. It will happen during boot or when MacOS is fully loaded.
During boot, for a split second the apple logo will sometimes have a red square background and the loading bar becomes green.
The it will go into boot loop or get stuck not turning on at all.
When J6951 is not connected (no battery power), it seems to run fine.
SYS_DETECT_L is 0.02V, SMBUS_SMC_5_G3G_SCL and .._SDA are both 3.38V, no shorts to ground.
Putting the logic board in another topcase shows same symptoms.
Also tried another SSD and external drive.
Owner says it happened after OS update. Then he changed the SSD and it was fine for 3 days. Has been showing these symptoms since.
This board will randomly crash when the cable at J6951 is connected. It will happen during boot or when MacOS is fully loaded.
During boot, for a split second the apple logo will sometimes have a red square background and the loading bar becomes green.
The it will go into boot loop or get stuck not turning on at all.
When J6951 is not connected (no battery power), it seems to run fine.
SYS_DETECT_L is 0.02V, SMBUS_SMC_5_G3G_SCL and .._SDA are both 3.38V, no shorts to ground.
Putting the logic board in another topcase shows same symptoms.
Also tried another SSD and external drive.
Owner says it happened after OS update. Then he changed the SSD and it was fine for 3 days. Has been showing these symptoms since.