820-00923 doesn't turn on

[buritix]

Hi everyone , I need help with this equipment, I don't have the schematics or .brd file , the board get 20.v and 0.87ma after that goes to 20.3 and 0.17ma

thanks

 

[2informaticos]

820-00923-A_.rar

drive.google.com

Post exact PPBUS_G3H voltage, without battery.
Do you get 3V3_S5/SUS?

Any history available?

 

[buritix]

PPBUS_G3H = 13.05v
3V3_S5 = 3.360v
3V3_SUS = 3.358v


coffee was spilled on the keyboard , but the board is clean
I inspected with a thermal camera and u7210 and u7100 were heated

thank you very much for the files

 

[2informaticos]

Check resistance to ground (ohm scale) at L7210/20.

 

[buritix]

L7210 = 3.7 ohms to ground
L7220 = 3.7 ohms to ground

 

[2informaticos]

Any voltage, or pulse at big coils?

 

[buritix]

both L7210/20 = when I plug the charger starts at 1.078v and after few seconds downs to 0.670 and do not change any more

 

[2informaticos]

Drop voltage looks like working board.
Did you check for USB activity?

 

[buritix]

I already checked and yes , it does usb activity

 

[2informaticos]

USB macOS pendrive flashing Link LED?
Caps Lock LED reacts?
In such case, you have an working board with video issue.
Check external video.

 

[buritix]

Thank you very much, the macbook is working, the keyboard was short-circuited due to water damage