Dell XPS 13 9370 - CAZ60 LA-E671P No POWER, No CHARGE

[D@nt3s_1nfern0]

What is the voltage to ground of:

Pin 16 ; ADP (PU300)

ALW_PWRGD_3V_5V

PU300 Pin 16 voltage is 4.999v

the net name you mentioned underneath corresponds to PU500 , if thats the one you wanted then the voltage on Pin 16 was 3.374v

[mon2]

Measure the voltage on pin #9 of PU500 = PG = power good. Must be a logic '1' to denote the power is good.

[D@nt3s_1nfern0]

Measure the voltage on pin #9 of PU500 = PG = power good. Must be a logic '1' to denote the power is good.

voltage on pin9 of PU500 is 3.344v

[mon2]

Some of the inductor checks from post #2 were missed. Measure the resistance to ground of:

PL601
PL701
PL801
PL901

PL1107
PL1151
PL1403
PL1401
PL1503
PL1501

[D@nt3s_1nfern0]

Some of the inductor checks from post #2 were missed. Measure the resistance to ground of:

PL601
PL701
PL801
PL901

PL1107
PL1151
PL1403
PL1401
PL1503
PL1501

PL601= 600 ohm
PL701= 105 ohm
PL801= 1.2 mega ohm
PL901= 1.2 mega ohm

PL1107= there is no component there
PL1151=23.4 Ohm
PL1403= 72 OHM
PL1401=98 OHM
PL1503= there is no component there
PL1501= there is no component there

[D@nt3s_1nfern0]

Some of the inductor checks from post #2 were missed. Measure the resistance to ground of:

PL601
PL701
PL801
PL901

PL1107
PL1151
PL1403
PL1401
PL1503
PL1501

in the places that are no components sould i just measure the pads ?

[mon2]

No components should be ok to leave alone. They are likely optional parts for optional versions of the PCBA builds. Assuming that this unit worked as-is before otherwise if purchased from Ebay or similar - perhaps someone removed parts before selling the unit to you? Have had this happen on Ebay to us. Vultures in California - some hack of a repair shop there stripped off many critical parts from a macbook before selling to us. Destroyed our USB-C charger upon first use.

[D@nt3s_1nfern0]

No components should be ok to leave alone. They are likely optional parts for optional versions of the PCBA builds. Assuming that this unit worked as-is before otherwise if purchased from Ebay or similar - perhaps someone removed parts before selling the unit to you? Have had this happen on Ebay to us. Vultures in California - some hack of a repair shop there stripped off many critical parts from a macbook before selling to us. Destroyed our USB-C charger upon first use.

No the device was not purcased from ebay. also i can confirm that the solder joints they look factory. so i believe they are optional for other versions of PCBA.

Is your mind guessing why te board is behaving like that? you think the PU300 is faulty ?

[mon2]

No. Suspecting at this time that there is something wrong with the power delivery controller. The PD controllers @ U19 / U20 / U21 are responsible to communicate with the external power adapter to extract the power contracts and then select the best one to fully power this board. Perhaps the firmware of the PD controller (held inside of UT6) is corrupted. It is strange that the 20V pd contract is actually selected and then reset back to the 5v default.

Do you see the same reaction for all USB-C ports? Do test each USB-C port by rotating the USB-C connector by 180 degrees to confirm the opposite side of each connector. This process will test the CC1 and also the CC2 communication lines that are present on each USB-C connector.

[D@nt3s_1nfern0]

No. Suspecting at this time that there is something wrong with the power delivery controller. The PD controllers @ U19 / U20 / U21 are responsible to communicate with the external power adapter to extract the power contracts and then select the best one to fully power this board. Perhaps the firmware of the PD controller (held inside of UT6) is corrupted. It is strange that the 20V pd contract is actually selected and then reset back to the 5v default.

Do you see the same reaction for all USB-C ports? Do test each USB-C port by rotating the USB-C connector by 180 degrees to confirm the opposite side of each connector. This process will test the CC1 and also the CC2 communication lines that are present on each USB-C connector.

Yes i just did checked all 3 usb ports on both sides of the Type C. They all behave the same. Is there a controller that regulates all of these ports ?

[mon2]

There is a local PD controller for each port but it appears that only one is holding the firmware @ UT6 flash device. One thought is that perhaps after the 20V PD contract is reached, an event of excessive current draw occurs and is reported back to the PD controller(s) to power down. This flag would be through one of the GPIO pins on the PD controllers and the firmware would have to be coded to support this feature.

Suggest to backup and reflash UT6 provided a dump of this flash memory is available. Only a suggestion to rule out firmware corruption. It does take working firmware to negotiate the 20v contracts but why does it reset back to 5v??

Are you power cycling with the USB-C meter?

[D@nt3s_1nfern0]

There is a local PD controller for each port but it appears that only one is holding the firmware @ UT6 flash device. One thought is that perhaps after the 20V PD contract is reached, an event of excessive current draw occurs and is reported back to the PD controller(s) to power down. This flag would be through one of the GPIO pins on the PD controllers and the firmware would have to be coded to support this feature.

Suggest to backup and reflash UT6 provided a dump of this flash memory is available. Only a suggestion to rule out firmware corruption. It does take working firmware to negotiate the 20v contracts but why does it reset back to 5v??

Are you power cycling with the USB-C meter?

Hello mon2 and goodmorning (from greece)

unfortunately i do not have the tools to do reflash of the UT6. Can that chip be replaced if i buy one from the internet ?

i tried to power cycle with and without the usb-c meter