820-00281 No Power

HEy I am working on a 820-00281 with no power. So usb meter was sticking at 5v with 32amps when i started. Noticed corrosion on CB300 which is PP3v3_G3H. Removed that cap and now I get 20v (sometimes at 1.4 amps, sometimes at 14amps or sometimes at 5 amps.

PPDCIN_G3H is missing
PP20V_USBC_XB_VBUS is missing

Do you think it is CD3215 chips?

PPBUS_G3H is 1v
 

2informaticos

Administrator
Staff member
You've said to get 20V at USB-C inputs now.
Each USB-C port has its VBUS line; you must check each port separately.
CD3215 chips should be good, if switch to 20V.
Check if all ports have the same behaviour.
 
All ports have same behavior but anos at 5,47 which is a little high. let me give some more details

PP20V_USBC_TA_VBUS 20v
PP20V_USBC_TA_VBUS_F 20v
PPDCIN_G3H missing
PP20V_USBC_TB_VBUS missing
PP20V_USBC_TB_VBUS_F missing

Could it be the B controller?
 

2informaticos

Administrator
Staff member
Please confirm, do you get 20V at USB-C voltmeter, but 0V at R7020???
That is impossible; it will imply no 3V3_G3H present, and CD3215 chips cannot switch to 20V.
Are you using original 87W charger?
 
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