820-01598 reboots shortly after boot up bar starts to load.

No-Clean

Member
Clean board, no history.

All SSD rails measure correct.

Tried restoring and reviving T2 but fails.

Starting from external drive not possible because we cannot change startup options in recovery mode.

I am assuming that NAND chips or one of them may be dead.
 

2informaticos

Administrator
Staff member
This happened to me with 01521 board.
I finally found a shorted signal from a speaker amp to T2; it was located inside T2.
Was impossible to complete DFU on it...
 

No-Clean

Member
Yes in this case T2 is unable to restore/revive, I will check again the audio board and see, thanks a lot!
 

2informaticos

Administrator
Staff member
I had one with T2 shorted on SPKRAMP_RESET_L; caused by leakage from PPBUS_G3H in audio board.
That one I got it working after complete DFU,
Of course, no speaker sound, only headphones.

The one above mentioned (previous post), never complete DFU and was impossible to repair it.
T2 found shorted on a line corresponding to the other (onboard) speaker amp.
However, on other service, both boards have been connected in the same shell, with liquid damaged audio board and flex.
 

No-Clean

Member
This board and audio board is clean and there is no sings of water damage, I tried a new audio board but no luck.
 

2informaticos

Administrator
Staff member
I just gave an example about very similar symptom, caused by T2 internal damage.
In your case, can be other reason of damage.
 
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