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

[D@nt3s_1nfern0]

Hi there guys i have this laptop that doesnt power on. When i plug the charger i see 2 white blinks on the front leds with a small delay. If i press the power button the led ligts up for less than a second then dies down.

When i plug in the USB AMP meter on the Type C i get 20v and a jump up to 0.34A then the value changes to 5.02v 0.03-5A. Please if someone could guide me on how to troubleshoot and possibly fix it. i am new into fixing boards so this will be a valuable lesson to me.
Thank you in advance guys .

[mon2]

Remove all power. Meter in resistance mode. Measure the resistance to ground of each inductor (often grey in body color and with 2 pins - one on each side). Each such inductor is linked to a local switching power supply. Each rail is being tested for shorted parts which will cause that local power regulator to sense an excessive current draw and then that power rail will power off for safety.

Post any suspects found during your inspection.

What is the history of this unit? Just died one day? A good day to die?

[D@nt3s_1nfern0]

Hello and thank you for your reply.

Just stoped working one day. i dont see any obvious issue on the board like burn or liquid damage.

ok so here are the inductor measurements

PL1100 =7.1 ohm
PL1103 = 7.1 ohm
PL1150 = 10.5 ohm

PL301 = 28 Kilohm
PL302 = 128 Kilohm
PL501 = 28.1 Kilohm
PL504 = 50 Kilohm

[D@nt3s_1nfern0]

Remove all power. Meter in resistance mode. Measure the resistance to ground of each inductor (often grey in body color and with 2 pins - one on each side). Each such inductor is linked to a local switching power supply. Each rail is being tested for shorted parts which will cause that local power regulator to sense an excessive current draw and then that power rail will power off for safety.

Post any suspects found during your inspection.

What is the history of this unit? Just died one day? A good day to die?

The first 3 that their measurements are on the range of ohms does that indicate a short ?

[mon2]

PL1100 =7.1 ohm
PL1103 = 7.1 ohm
PL1150 = 10.5 ohm

Each is ok. The first 2 are linked to VCORE = CPU power rail. By design low voltage rails are with a low resistance to ground.

PL1150 = power rail for the GPU. Again, not considered a short.

Review the charger IC @ PU300.

Carefully measure only if you have fine tipped meter probes, the voltage to ground of the following:

Pin 17 ; DCIN for PU300
Pin 19 ; CHG_ACIN
Pin 24 ; ACOK
Pin 15 ; CSIP
Pin 14 ; CSIN

Post each measurement.

[D@nt3s_1nfern0]

Each is ok. The first 2 are linked to VCORE = CPU power rail. By design low voltage rails are with a low resistance to ground.

PL1150 = power rail for the GPU. Again, not considered a short.

Review the charger IC @ PU300.

Carefully measure only if you have fine tipped meter probes, the voltage to ground of the following:

Pin 17 ; DCIN for PU300
Pin 19 ; CHG_ACIN
Pin 24 ; ACOK
Pin 15 ; CSIP
Pin 14 ; CSIN

Post each measurement.

Pin 17 = 8.5v
Pin 19 = 0.912v
Pin 24 = 3.045v
Pin 15 = 4.999v
Pin 14 = 4.999v

[mon2]

PD300 appears to be defective. You should see the power adapter voltage on pin #17. Confirm again. The higher of the 2 power sources should appear on pin #17.

[D@nt3s_1nfern0]

PD300 appears to be defective. You should see the power adapter voltage on pin #17. Confirm again. The higher of the 2 power sources should appear on pin #17.

ok so when i plug in the usb meter with the power adapter the meter shows 20v and in the pin 17 shows 20v as well but after a few seconds the usb meter drops to 5v and then the measurement on pin 17 drops to 8.5v

[mon2]

Noted. Remove all power. Meter in resistance mode. Measure the resistance between pins #1 and #2 on PU300. Confirm the full path resistance for the battery charger circuit. This total resistance must be close to the schematic values else the charger IC will see this is as a risk and power down. Post the measurement.

Measure directly on the charger IC pins (without power).

[D@nt3s_1nfern0]

Ok just to confirm that i will put the one probe on pin 1 and the other on pin 2 no matter the colors right ? if thats the case then i do get 4.3 ohms

[mon2]

Correct. The resistance is correct and is not the fault.

Is the USB-C power adapter the original device for this laptop? You cannot use a cell phone / mobile charger.

[D@nt3s_1nfern0]

Correct. The resistance is correct and is not the fault.

Is the USB-C power adapter the original device for this laptop? You cannot use a cell phone / mobile charger.

It is the correct carger indeed. model No: HA45NM180

[mon2]

What are the results if you power up without the battery connected? Is the 20v steady or also powers up / down to 5v?

[D@nt3s_1nfern0]

What are the results if you power up without the battery connected? Is the 20v steady or also powers up / down to 5v?

It powers down to 5v after a while. checked all the 3 ports

[mon2]

Does it reach 20v without the battery?

Measure the voltage to ground on each pin of the battery connector. The SMBUS (SCL / SDA) pins are of most interest. These lines are also used to communicate with the charger IC. If either of the TVS diodes have triggered, they will shunt the communication.

[D@nt3s_1nfern0]

Does it reach 20v without the battery?

Measure the voltage to ground on each pin of the battery connector. The SMBUS (SCL / SDA) pins are of most interest. These lines are also used to communicate with the charger IC. If either of the TVS diodes have triggered, they will shunt the communication.

yes it does

[D@nt3s_1nfern0]

Does it reach 20v without the battery?

Measure the voltage to ground on each pin of the battery connector. The SMBUS (SCL / SDA) pins are of most interest. These lines are also used to communicate with the charger IC. If either of the TVS diodes have triggered, they will shunt the communication.

should i do that with the battery connected ?

[D@nt3s_1nfern0]

Does it reach 20v without the battery?

Measure the voltage to ground on each pin of the battery connector. The SMBUS (SCL / SDA) pins are of most interest. These lines are also used to communicate with the charger IC. If either of the TVS diodes have triggered, they will shunt the communication.

Pin 6 = 3.094v
Pin 7 = 3.374v
Pin 8 = 3.374v
Pin 9 - 12 = 5.023v

[D@nt3s_1nfern0]

Does it reach 20v without the battery?

Measure the voltage to ground on each pin of the battery connector. The SMBUS (SCL / SDA) pins are of most interest. These lines are also used to communicate with the charger IC. If either of the TVS diodes have triggered, they will shunt the communication.

took the readings with the battery disconnected. If i had to do it with the battery being connected please let me know

[mon2]

What is the voltage to ground of:

Pin 16 ; ADP (PU300)

ALW_PWRGD_3V_5V