820-01700 boot loop

iClub

Member
I have already restored several times the T2 in DFU mode, but no result, do you have any idea what it can be?
 

iClub

Member
When you are in the CMD+R screen the mac doesn't turn off, only after you install macOS.
 

iClub

Member
The installation is not interrupted. When it starts for the first time, the Mac reboots.


The installation was done over the internet.
 

iClub

Member
The board is perfect.
The customer reports that he is using it and turned it off out of nowhere. The cooler suddenly speeds up.
 

2informaticos

Administrator
Staff member
Possibly GPU issue.
I suppose its driver is not loaded booting in safe mode.
Check how it appears in system report.
 

2informaticos

Administrator
Staff member
Mmmmh, looks like AMD graphics is in use.
Test the machine booting in normal mode, with external monitor connected.
 

2informaticos

Administrator
Staff member
Try to discard peripherals issue.
Test first with external monitor, disconnecting internal LCD connector.
 

2informaticos

Administrator
Staff member
In safe mode, run HWMonitor and post screenshot with all values

Adjust security settings to allow USB boot and test the machine with USB macOS.
Try to switch between GPU/iGPU with gfxcardstatus, if possible.

Can you login into macOS starting in SMC bypass?
 
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