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820-00850-A - Tries to turn on and restarts

M

mushr00m

Member
820-00850-A

It tries to turn on
appears the Apple logo and starts loading and the it crashs and keep in a loop

Customer told that before brings to me it appears even the login screen and then crash

Doing visual inspections the board looks fine

Is it board issue or the disk is crashed and needs to be reinstalled with the Apple Configurator?

Which measures should I take?
 
2informaticos

2informaticos

Administrator
Staff member
If no important data, go for DFU restore.
You can try DFU revive anyway; it doesn't erase SSD.

To save data (at least intenting), try to connect in Target Disk mode.
 
M

mushr00m

Member
Yes. Acutally I need the data!

DFU revive in target disk mode. OK

Will look for a complete youtube tuturial. If you have one please let me know!
 
M

mushr00m

Member
Just assemble again and now it turns on all the time and goes to question mark folder

Using option to enter it there is no SSD drive.

Do I still need to use Apple Configurator and try revive?
 
2informaticos

2informaticos

Administrator
Staff member
DFU and Target Disk mode are totally different things.

Seems to have SSD problem, if is not even recognized now.
 
2informaticos

2informaticos

Administrator
Staff member
All SSD power rails are good?

Change security settings and boot from USB macOS.
Then check if appears on Disk Utility, at least.
You can also check in Target Disk mode.
 
M

mushr00m

Member
I tried booting into recovery mode it after it loads the recovery mode it restarts loading the recovery mode system and the crashs and its in a LOOP doing that

Didn't check SSD power rails yet

How to change security settings and boot from USB macOS? Is it possible to use high sierra USB stick?
 
M

mushr00m

Member
I tried both using USB stick with High Sierra and Recovery Mode

Both FREEZES the screen and did NOT go to the next screen where I have the options to reinstall the system, disk management and etc.

What should I do?
 
M

mushr00m

Member
Just to give sharp detaisl

With USB stick connected through adapter it freezes as soon as the disk option appears and the icon of loading right besides wifi get stuck

Recovery mode its loads normally the first stage and the next stage when start to load it restarts
 
M

mushr00m

Member
Tried with windows but the exactly same behavior happens with any USB stick

Appears apple logo as usual
Then change to disk selector and freeze instantly
The loading icon get stuck right away

If I turn ON without any USB connected it goes to disk selector and then put after its stable on disk selector it works but freezes on the next step

Any other way to check and/or fix this board?
 
M

mushr00m

Member
What do you mean by recover the data?

I am not even able to enter the disk utility after turning the machine ON

The SSD does not appear on the DISK SELECTOR screen even when one or other time it arrived there without FREEZING!
 
2informaticos

2informaticos

Administrator
Staff member
Then data is already lost.
You can try DFU restore, just in case.
If still not possible, then SSD is really bad; may need to change the NANDs...
 
M

mushr00m

Member
Update

Did the DFU restore and still almost the same issue

Tried both Catalina and High Sierra known working USB stick that I have

They are not FREEZING anymore but as soon as I choose them it goest directly to the globe icon and wifi selector to go to recovery mode which still in a loop and not acessible

What do you think?

Any other test? Replace NAND? or entire board?
 
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