(347) 552-2258 [email protected]

820-00840 no power

Mac Tech

Mac Tech

Member
This team tells me the client that it was turned off out of nowhere.

PPBUS_G3H 13.05V

CPU voltages, PPVCCCPU_S0G is 0.95 then drops to 0.66v.

There is no startup sound.

PM_PCH_PWROK and PM_PCH_SYS_PWROK present with 2.96V

AP_RESET_L 3.0V
PLT_RST_L 3.31V

RAM voltages present.

I don't know what else to do, CPU dead?
 
Mac Tech

Mac Tech

Member
yes i did that I disconnected the flex from the LCD so that I can take an image through the USB c to HDMI adapter and nothing...
 
Mac Tech

Mac Tech

Member
no, the keyboard light does not turn on, and the top case works because it is from a computer that is 100% operational.

There is no light on the keyboard but there is click on the trackpad it is very strange
 
2informaticos

2informaticos

Administrator
Staff member
TP click is not a life sign.
If Caps Lock doesn't react, I bet no USB activity present; be sure to check properly.
I was talking about USB activity, not USB power.
USB mouse with light on, doesn't confirm activity.

Did you try known good BIOS?
 
Mac Tech

Mac Tech

Member
I don't understand when you mean usb activity... but when I connect a usb c to normal usb the led lights up
 
2informaticos

2informaticos

Administrator
Staff member

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 boards.rossmanngroup.com
 
You must log in or register to reply here.
Top