820-00850 5V 0.4A

[yair37]

suddenly dead.
5v 0.4a on charger
ppbus pulsing 12v-10v every 1-2sec.
not enter to DFU.
didnt see any short on board.

 

[2informaticos]

Remove F7000 and check if C7050 voltage is stable.

 

[yair37]

yes its 12v stable

 

[2informaticos]

I bet for 12.3V, isn't?

Resolder F7000 and check 3V3_G3H_RTC now.

 

[yair37]

3V3_G3H_RTC 3.4v stable

 

[2informaticos]

Do you get expected SLPS2R and AWAKE voltages?
Also check G3S voltages.

 

[yair37]

All SLPS2R and AWAKE voltage pulsing from 0.5v to 0v
dont get voltage on G3S lines..

 

[2informaticos]

Check U7800 LDOs (page 75).