820-02016 no image

[Kyle93]

Arrived with no drop or spill damage. It will turn on and chime with backlight but no image on external or internal. After a couple minutes caps lock light can be turned on and off.

What should be checked next??

 

[TCRScircuit]

The M1s likely need to be signed into the OS to give you image on external. You may need to have the internal display plugged in on the 820-02016 or else it will be stuck in the SLEEP 3 state.

If caps lock light comes on the machine is booted. Are you positive this is not no backlight? It can be very hard to see on the newer retina displays.

 

[Kyle93]

Yes since after the machine is plugged in as you hear the chime the screen itself brightens up some

 

[2informaticos]

Any voltage at PPVOUT_LCDBKLT (when you hear the chime)?

 

[Kyle93]

43.45V

 

[Kyle93]

Also tried connecting to external while the internal was connected as TCRS suggested, external backlight comes on as well but no image on either screen.

 

[2informaticos]

Backlight voltage is good, so the problem is with image only.
Looks like M1 graphics issue, if you miss internal/external image at same time.
Did you try PRAM reset?

 

[Kyle93]

Yes but there is no response to the reset no matter how long the keys are held.

 

[2informaticos]

What said the client about how symptom appeared?

Try DFU, just in case.

 

[Kyle93]

Client said the issue just randomly started.

Tried DFU but it fails, even after failed DFU you can still hear the chime and the backlight appears.

 

[2informaticos]

What error did you get on DFU?

Can you get access to SSD in target Disk mode?
If yes, save data and try restore in DFU.

 

[Kyle93]

"Failed to restore device in recovery mode, libusrestore error 2015"

No reaction when trying target disk mode. Data is important.

 

[2informaticos]

"Failed to restore device in recovery mode"
Isn't correctly recognized in DFU mode?

Try forcing with SWV011; solder RV020, if not there.

 

[Kyle93]

Yes it's correctly recognized in DFU. Message appears after system finishes downloading

 

[2informaticos]

You should get access in Target Disk mode also.
Turn it off, then maintain pressed T key; no need to press power button.

 

[Kyle93]

Turned back on only maintain pressing T key. Hear the chime but nothing else happens, nothing shows up on target mac. Caps lock light still reacts within a few minutes even after only pressing T key after being turned off

 

[2informaticos]

Try on all USB-C ports.
Also open Disk Utility on the other MacBook, to detect it.
Machine should turn on when you start pressing T key; maintain pressed and check in Disk Utility.

 

[Kyle93]

Tried all usb-c ports but no change. Nothing external ever shows up in disk utility. Other Macbook is running Monterey

 

[2informaticos]

The symptom points to M1; internal graphics issue.
But is strange that you cannot complete DFU, not get access in target Disk mode.
Looks like lost cause...