Dell XPS 13 9370 CAZ60 LA-E671P zalany, brak ładowania

Were these measurements performed with or without battery connected?

Measure the resistances between listed pins of charger chip PU300:
- Between pin 1 and pin 2.
- Between pin 14 and pin 15.

Measurements were taken without battery connected (RTC battery also disconnected)

PU300 Resistance Ohms:
Pin 1-2: 2.9Ω
Pin 14-15: 5.1Ω

Thanks

- Remeasure the voltages to ground on pins 1, 2 of charger chip PU300.
- Measure the voltages to ground on pins 1, 2 of transistor PQ300.

Transistor PQ300 pin count:

Hi, Im back - PU300 pin 1 voltage to ground - 8.6V, pin 2 9.0V
PQ300 pin 1 3.1V
pin 2 0,26V
pin 3 0V
Thanks

adysowski написав:PU300:
Pin 1: 8.5V
Pin 2: 8.11V

adysowski написав:PU300 pin 1 voltage to ground - 8.6V, pin 2 9.0V

Your measurements are different every time...

adysowski написав:PU300:
Pin 24: 0V

adysowski написав:PQ300 pin 1 3.1V

Pin 24 of PU300 is directly connected to the pin 1 of PQ300, but you have different voltages on this two pins. How is this possible, except the copper trace on the board is damaged, which is quite unlikely?

Please, use a different 100% good meter and provide the correct measurements, otherwise I can't help you diagnose the board with unreliable measurements.

Hi, sorry for bad measurements, i used two different meters. Now I will use only Fluke 115 which is 100% good. Okay - once again -
PU300 Measurements:
Pin 1 - 8.50V
Pin 2 - 8.12V
PQ300 Measurements: - why they are different - sometimes when i plug in AC Adapter to this computer i get 0V on PQ300 (for example.) and after a while Voltage kicks in. I dont know if its supposed to do it. Like when I plugged in this AC Adapter a while ago i had Pin 1 3.1V, after 3 minutes I have got 2.48V.
So right now - PQ300 - Pin 1 - 2.48V, Pin 2, 1.26V, Pin 3 - 0V.
Thanks and sorry for problems

- Measure the voltages to ground on both pins of resistors PR300, PR304.
- Remeasure the voltages to ground on pins 3, 4, 8, 12, 14, 15, 16, 17, 18, 19, 24, 25 of charger chip PU300.

Hi, while I was trying to measure pin 19 i accidentally shorted pin 18 to pin 19... Diode PD300 burnt immediatly, I replaced it with a new one (the same) but now i dont have 5V on board, tried to check at thermal camera, but there is nothing obvious that could be shorting, but I found (earlier also, before this short accident came) that PU101 I replaced is getting a little hot. Any ideas? pin 19 of PU300 is getting 0.126V right now.

Measure the resistance to ground on pin 5 of PU101.

I measured resistance to ground on all pins of PU101:
Pin1 - 410kΩ
Pin2 - 0.4Ω
Pin3 - OL
Pin4 - 250kΩ
Pin 5 - 2.36MΩ
Thanks

adysowski написав:Diode PD300 burnt immediatly

At 99% the charger chip PU300 and resistor PR309 (2Ω) are also burned. Replace them.

Hello, Im back - finally new PU300 charger chip came I replaced it - 5V is back, measurements - PU300 Voltage to ground:
Pin1 - 1.6V
Pin 2 - 1.6V
pin 3 - 1.6V
pin 4 - 5,4V
pin 5 - 0.3V jumping to 1.9V for a moment
pin 6 - same as pin 5
pin 7 - 4,85V
pin 8 - 5.09V
pin 9 - 4,85V
pin 10 - 0.3V
pin 11 - 2,1V
pin 12 - 2,05V
pin 13 - NC
pin 14 - 20.01V
pin 15 - 20.01V
pin 16 - 20.01V
pin 17 - 19.5V
pin 18 - 2.67V
pin 19 - 3.68v
pin 20 - 0V
pin 21 - 0V
pin 22 - 0V
pin 23 - 0.13V
pin 24 - 0.13V
pin 25 - 0,11V
rest is 0V

The resistor PR308 (4.7Ω/5%, package 0402) is damaged almost for sure. Check it.

Hi! I replaced PR308, motherboard still doesn't work, measurements almost identical to last post. What should I check next? B+ is 1.6V. Thanks for help

Remeasure the voltage to ground on pin 18 of charger chip PU300.

PU300 Pin 18 - 2.2V Thanks

PU300 Pin 18 - 2.2V

There should be 5v. What resistance to ground do you have?

Pin 18 PU300 resistance to ground - 29.2k Ohm Thanks for help

Measure the voltages to ground on both pins of resistor PR308.

PR308 - Upper Pin - 2.2V
Bottom Pin - 2.18V
Thanks