Dell XPS 13 9370 no power USB amp meter reads 5V , 0.11A

[waakye]

@ anhbanxoi, I injected 0.8V at PL501and there is 0 current draw.

[waakye]

Any help guys!

[mon2]

The usb logs are looping the details of the power adapter and not selecting a power delivery contract.

SRC_CAPABILITIES DATA: 2C9101082CD102002C2103002CC103002CB10400FAA00500E140060
Option: EPW
[1] Fixed : 5V - 3A
[2] Fixed : 9V - 3A
[3] Fixed : 10V - 3A
[4] Fixed : 12V - 3A
[5] Fixed : 15V - 3A
[6] Fixed : 18V - 2.5A
[7] Fixed : 20V - 2.25A

Log the traffic of a working usb c device to see the difference. After learning of the pd options, a contract will be selected.

[waakye]

Thanks mon2
I saw all the traffic from a working USBC. Do I need to reprogram the USBC controller chip. How will it negotiate the 20V? I guess I have to find a way to program the firmware on the new pd chip.

[mon2]

With the meter in DC volts mode, measure the voltage to ground of:

PBAT_CHARGER_SMBDAT
PBAT_CHARGER_SMBCLK

What are the measurements?

[waakye]

Thanks again mon2. The following were taken from PD104 pin 2 and pin 3.
PBAT_CHARGER_SMBDAT = 0VDC
PBAT_CHARGER_SMBCLK = 0VDC

[mon2]

Locate the pull ups for these 2 lines to confirm if there is a pull up voltage.

[waakye]

Reading 0VDC at RE111 and RE112

[mon2]

So you are missing +3VALW. This rail is created by PU500.

Review the voltage to ground measurements of PU500. Confirm the LDO rail @ pin 17. Enable voltages on pin 11 and pin 12?

[waakye]

Hey mon2,
Voltage measurements on PU500
Pin 17 = 0VDC
Pin 11 = 0VDC
Pin 12 = 0.266VDC

Thanks

[anhbanxoi]

Hey mon2,
Voltage measurements on PU500
Pin 17 = 0VDC
Pin 11 = 0VDC
Pin 12 = 0.266VDC

Thanks

Do you get any voltage at pin 2 3 4 5?

[waakye]

Pin 2, 3, 4 and 5 all reads 0VDC.

[mon2]

Connect the battery and confirm the voltage on the same pins 2-3-4-5 again.

Review the DCin power path mosfets that are from the power adapter. See the circled pins. What is the voltage to ground?

[waakye]

Battery connected pins 2-3-4-5 reads 0.004VDC
PQ307 pin 7 measures at PL301 pin2 = 0vdc
PQ307 pin 2 measures at PR304 pin1 = 0.003vdc

Thanks

[mon2]

Is this with the power adapter connected? If not, repeat the measurement with the power adapter.

[waakye]

The readings were taken with the power adapter connected.

[mon2]

Measure the voltage to ground of the highlighted points of interest.

[waakye]

Voltage to ground
PD300 pin 2 = 0.015vdc
PU300 pin 17 = 0.0015VDC
PL302 pin 2 = 0.005VDC
PD301 pin 2 = 1.1VDC

[mon2]

Determine which usb type-C connector is being used by the power adapter. This power path will lead to 2 x DCin mosfets. Which mosfets are in this path to the charger IC? The mosfets in the middle are not being enabled. From the earlier reviews, you also do not have 20v from the power adapter which is of concern.

[waakye]

using JUSBC1 PORT
Voltage to ground
PD300 pin 2 = 4.730VDC
PU300 pin 17 = 8.03VDC
PL302 pin 2 = 4.730VDC
PD301 pin 2 = 8.38VDC