Seeking boardview+schematics for Thinkpad L14 Gen 2 NM-D391 with AMD CPU

[trepachka]

I have this Thinkpad L14 Gen 2 NM-D391 board with AMD CPU. It works fine off the battery but when the charger is plugged into any of the 2 USB-C ports, computer is stuck @ 5V 0A

It does have a dual PD controller TPS65988DJ. Both inputs are showing 5V is reaching both ports. I suspect the chip is ok but rather OVP is dead and preventing the board from communicating with the charger.

Does anyone have the boardview+schematics for this motherboard?

Thank you

[AL._.EX]

Schematic & boardview

[trepachka]

Thank you very much for that.

Looks like chip U6301 (SN1904020YBFR) is standing between the charging port and the pd controller. I desoldered current pd controller and tested it on another board and it passed.

[trepachka]

There are 2 of these on the motherboard: U6201 and U6301. I will order the chips later today and report the outcome.

[rookieme]

There are 2 of these on the motherboard: U6201 and U6301. I will order the chips later today and report the outcome.

did you managed to fix it?

[trepachka]

I replaced them both. Same result

[rookieme]

I replaced them both. Same result

From a search I did it seems that TPS65988 is the one that controls the input voltage.
If the data channels of usb don't have any brocken trace of shorted esd diode it is all about firmware for the TPS65988.
There should be an external eeprom nearby that needs to be reprogrammed.
I have a same case and resea.rching for a solution

[trepachka]

The TPS65988 was replaced. I also placed the original chip into another motherboard and I can confirm it works. Having eeprom reprogrammed is another good idea. I just don't have the tools for it.

[trepachka]

I borrowed the firmware chip from a working board. No changes.Computer is still drawing 5V 0A at both USB-C ports. It runs off the battery just fine.