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

adysowski napisal/-a:PU300 Voltage to ground:
pin 8 - 5.09V

Is this measurement correct?

At the time of writing yes, but right now there is 2.19V.. I dont know why sometimes this measurements are not the same, something is changing them, but I dont know what. One time i get 5V here (like in posts before), one time there is 2.19V like now. There must be some problemy anywhere.

Check your solder joints on all pins of charger chip PU300.

Resoldered PU300. Checked all connections, everything looks okay. Made new traces (again!) of pins 1,2,3 PU300. Still same result.

Please, post a clear picture of the charger chip area of the board with a nearby surroundings.

That black thing is a soldermask. Thank You, I think that something is missing (like a signal or anything). Have great day

Measure the resistances between the listed points:
a) Between pin 1 and pin 2 of chip PU300.
b) Between pin 1 of chip PU300 and pin 1 of transistor PQ304.
c) Between pin 2 of chip PU300 and pin 4 of transistor PQ307.
d) Between pin 3 of chip PU300 and pin 4 of transistor PQ307.
e) Between pin 5 of chip PU300 and pin 1 of transistor PQ307.
f) Between pin 6 and pin 10 of chip PU300.
g) Between pin 7 of chip PU300 and pin 8 of transistor PQ307.
h) Between pin 9 of chip PU300 and pin 8 of transistor PQ302.
i) Between pin 11 of chip PU300 and pin 1 of transistor PQ302.
j) Between pin 14 and pin 15 of chip PU300.
k) Between pin 15 of chip PU300 and pin 4 of transistor PQ302.

Transistors PQ302, PQ307 pinout:

Hello, here are measurements Thanks:)

a) 4.5 Ohm
b) 2.3 Ohm
c) 2.3 Ohm
d) 0.1 Ohm
e) 0.1 Ohm
f) 0.1 Ohm
g) 0.1 Ohm
h) 0.1Ohm
i) 0.1 Ohm
j) 6.8 Ohm
k) 3.4 Ohm

The measurements seems fine.

It's most likely one of the following reasons:
- Badly soldered charger chip PU300. Make sure that all solder joints are fine. It's best to use a microscope or a magnifying glass with a high magnification (30-40x magnification). You can find it as "Jewellery identifying lupe", "Jewellery magnifying glass" or similar phrase:

- The charger chip is bad or it's a chinese fake. Try to buy another one from a different vendor, or best get one from some donor board.
- If everything is fine replace the transistors PQ302, PQ307.

Okay, i gave up on that board, i got one for parts and one to repair cheap. Chip U21 and UZ5 were getting hot. I got this board from owner who claims that his USB-C charger killed this board. I replaced U21 and UZ5 from donor board, power lits up for a while (like 3-5 seconds) then resets and again and again. 1V, 1.05V, 5V, 3.3V are present. What should i look at? Nothing is getting hot right now. Can RAM be damaged?