820-00850 stay USB-C at 5V

raainxx

Member
Hi, i have this board 820-00850, the issue the usb-c input stay at 5V (0,200A->0,400A).
i have PPBUS at 12,3V but cycling (9V to 12,3V)
i haven't the board file, i use the board file to 820-01041 but it's not same.
have you this file board? what can i check to same my problem?
i have this chip who is hot on the board (62°C, U3200? CD3215C00)
thanks
 

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2informaticos

Administrator
Staff member
Schematic/boardview available here...

All 4 USB-C ports 5V steady?
Compare diode mode readings in all LDO outputs of the CD3215 chips.
U3200 gets hot when you connect charger on the other ports?
If yes, change it...
 

raainxx

Member
thanks for schematic and boardview.
yes all 4 ports stay at 5V.
i check in diode LDO output and post after.
U3200 is hot when connect on all ports. if i need to change, can i take on another board, i haven't this board to pick this component.
 

2informaticos

Administrator
Staff member
Are these readings from U3200 only?
If yes, is bad.
But you should check on all CD3215 chips.

Be aware, you can remove the chips from other board, but only use CD3215C00, not A01, or B03.
These chips have firmware and termination code is very important...
 

raainxx

Member
yes i read on just U3200, i change U3200 and now the mac work.
Thanks for the chip firmware, i understand now for C00 & other.
 
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