Victor Holley
Member
I have 820-00840 that does not turn on.
Two USBC ports had different activity.
Port #1 =5v, 0.17A steady
Port#2 20v immediately cuts off, 0A then restarts
Found one drop of water on the board.
That drop made corrosion at R7021, R7022 near U7000. No water under U7000. Test point for PPVIN_G3HP3v3G3H was corroded away. No continuity between C7078 and C6991. Replaced resistors and made jumper to bring back continuity of PPVIN_G3HP3V3G3H
Also test point TBA_CSOR_N is corroded away, but this looks like it does not make an open when missing.
Result: Port#2 is now 20v and 0amp steady
I searched forum and read posts. Learned that step one is make both usb c ports the same.
Diode mode of LDO rails showed a short on PP3v3_UPC_XA_LDO.
Replaced only this CD3215
NOW BOTH usbc ports are THE SAME
20v, 0.00A
Measured PPBUS_G3H with no battery connected. Voltage= 1.1v declines to 0.95v and boosts to 1.1v, repeats pattern.
Diode mode on PPBUS_G3H = 0.429
I stopped here to ask what would you do with this board next?
Two USBC ports had different activity.
Port #1 =5v, 0.17A steady
Port#2 20v immediately cuts off, 0A then restarts
Found one drop of water on the board.
That drop made corrosion at R7021, R7022 near U7000. No water under U7000. Test point for PPVIN_G3HP3v3G3H was corroded away. No continuity between C7078 and C6991. Replaced resistors and made jumper to bring back continuity of PPVIN_G3HP3V3G3H
Also test point TBA_CSOR_N is corroded away, but this looks like it does not make an open when missing.
Result: Port#2 is now 20v and 0amp steady
I searched forum and read posts. Learned that step one is make both usb c ports the same.
Diode mode of LDO rails showed a short on PP3v3_UPC_XA_LDO.
Replaced only this CD3215
NOW BOTH usbc ports are THE SAME
20v, 0.00A
Measured PPBUS_G3H with no battery connected. Voltage= 1.1v declines to 0.95v and boosts to 1.1v, repeats pattern.
Diode mode on PPBUS_G3H = 0.429
I stopped here to ask what would you do with this board next?