A1990 (820-01814-01) not powering on, only 5V on USB

[highvoltage]

Hi there,

I have an A1990 (820-01814-01) not powering on.

On all 4 USB ports I only get 5V and around 100 to 200 mA.
(yes I know this is not accurate, but I only have one number after the decimal point at the moment)

On PPBUS_G3H I get 12.27V

What to check next?

Thanks in advance

 

[2informaticos]

As always with T2 machines, start with DFU...

 

[highvoltage]

never done DFU before.

I'll have to search for instructions first.

 

[2informaticos]

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...

boards.rossmanngroup.com

Follow the exact steps from linked tutorial...

 

[highvoltage]

I have tried DFU, but host machine did't recognize target machine.

 

[2informaticos]

Check if all AWAKE and SLPS2R voltages are present.