A1990 820-01041

Mori3000

New member
Hello

I have got A1990 that not starting, and was stuck on 5v, and i had no PPBUS_G3H, i got to replace the U7000 and now i have PPBUS_G3H.
I can take the computer to DFU mode but the restoring can not finish its job.

By the way i have 20v right now.
I measured some more and find out that:
PP1V8_G3S is 0v
PP5V_G3S is not fix and jumping between 2.5 - 5v.

May i have some advices, I can not find the problem and i do not know where these power creates.

On the USB_C meter the arrow some times show toward the computer and some times are against. and no amp.
 

2informaticos

Administrator
Staff member
Check at L9020/30/80 and L9520/30/80.

Write directly on the Reply box, do NOT click Reply button.
I don't see any reason to quote an entire post, visible few centimeters above...
 

Mori3000

New member
Thanks for your answer

L9020, L9030, L9080 all of them are just 0v.

L9080/81 reads 100 on diode mode, i compared them to another board and they should read 376.

I got to replace U9080 but it is still not working and same result
 

Mori3000

New member
Just as a history of the board, it seems that the board has been in another store before me and they have applied head on T2 chip U3900.

I,m wondering if it got some problem there!
 

2informaticos

Administrator
Staff member
You should not waste time in such machine.

SSD voltages must be present, to complete DFU process.
T2 has a dedicated firmware poartition there.
 
Top