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820-01521 one of the port is 5v

Y

yair37

Member
no water damage..port "1" 20v 2A port "2" 5v 0.04a PPBUS_G3H 12.3V on both.
replaced U3100 that control this port, the same, check all LDO pp1v1_upc_xa_ldo_bmc 0v diode mode 472(on U3200- 480)
where it can come from?
 
2informaticos

2informaticos

Administrator
Staff member
If charger switches to 20V when connected to U3200, then U3100 should be good partyially; T2 communicates with it at least.
You should have a problem on U3100 input side.
Compare diode mode readings between both ports in pages 30/31 and Q3100/200.
Inspect USB-C terminals for corrosion.
 
Y

yair37

Member
cant make it...
replaced j3300, switch between U3100 and U3200, also switch between Q3100/200 and also between q3440/30 and q3450/60 .
still the same...very weird..the XA side is the problem.. now i get PP1V1_UPC_BMC 1.1V but still 5v 0.05a
 
2informaticos

2informaticos

Administrator
Staff member
The other port switches to 20V?

Don't swap components without reason.
Check what I said first.
Probably corroded resistor, or broken trace.
 
Y

yair37

Member
j3300 diode mode:
XB - XA
TP_USBC_PP20V_XB/XA O.L/O.L
USBC_XB_CC1_CONN - 633 USBC_XA_CC1_CONN - 633
USBC_XB_CC2_CONN - 642 USBC_XA_CC2_CONN - 645
USBC_XB_USB_BOT_N - O.L
USBC_XB_USB_BOT_P - O.L
USBC_XA_USB_DBG_BOT_N - 320
USBC_XA_USB_DGB_BOT_P - 320
USBC_XB_USB_TOP_N - O.L
USBC_XB_USB_TOP_P - O.L
USBC_XA_USB_DBG_TOP_N - 320
USBC_XA_USB_DGB_TOP_P - 320
USBC_XB_SBU1 - 760 USB_XA_SBU1 - O.L USBC_XB_SBU2 - O.L USB_XA_SBU2 - 760
 
Y

yair37

Member
I2C_UPC_XA_DBG_CTL_SDA diode mode is 500 I2C_UPC_BA_DBG_CTL_SDA 720 the only thing that i see.
all traces for Q/U3100 are o.k
 
Y

yair37

Member
already did it.
i was now take out U3200/100and compere each pad.
is U3100- TP_USBC_XA_RESET_L (O.L) is the same as U3200- USBC_XA_RESET_L (760). (diode mode)
 
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