Dell Inspiron 15 3511 - brak startu, grzeje się charger

Witam szanownych kolegów. Na stole Dell Inspiron 15 3511 mb: GDM50 LA-L241P. Po podłączeniu zasilania pobór 0,15A i zupełny brak reakcji. Zauważyłem mocno nagrzewający się układ PUB01 - Intersil 95522AH - zdaje się charger baterii. Proszę o podpowiedź co dodatkowo sprawdzić przed wymianą układu. Obawiam się niepotrzebnych strat w wyniku ponownego spalenia nowego chipa.

Measure the voltages on pins 1, 8, 12, 14, 16, 17, 18, 21, 22, 24, of PUB01.
Measure the resistance to ground on pin 8 of PQB12.

Measure the resistances to ground on pins 8, 17, 18 of charger chip PUB01.

Thank you for your answers, below are the measurements:

1-0,4V
8-0,6V
12-0,44V
14-0,06V
16-2,24V
17-17,4V
18-0,6V
21-0V
22-0V
24-0,01V

resistances PUB01:

8-8.3ohm
17-2Mohm
18-3,3ohm-

resistances PQB12:

8- 5,6ohm

pawel1978 wrote:resistances PUB01:
18-3,3ohm-

That's a short circuit to ground - the capacitor PCB08 or charger chip is damaged.
Remove the capacitor PCB08 from the board and remeasure this resistance. If the resistance will increase to the high value (kΩ range or greater), the capacitor PCB08 is damaged.
If the resistance will still be low, the charger chip is damaged.

pawel1978 wrote:resistances PQB12:
8- 5,6ohm

That's also a short circuit to ground on the main power rail.
Measure the resistances on all coils in reference to the pin 8 of PQB12.

PCB08 is operational. PUB1 desoldered for replacement. Measurements for coils with 8 pin PQB12

PL301 - 20kohm
PL1801 - 1.9Kohm
PLG2 -350ohm
PLZ01- 120ohm
PLZ02 -119ohm
PL501- high resistance >20Mohm
PLB01- 195kohm

Perform a short circuit test described here on pin 8 of PQB12 (or any pin of resistor PRB02, because it's probably easier accessible). For a short circuit test limit the voltage to 3V. If nothing heats up, rise up the voltage limit to 5V. If still nothing, go to 10V.

In addition, check the transistors PQB11 and PQB12, because it may be also damaged.

PQB11 and 12 appear to be operational. Short circuit test one of the PRB02 legs. Voltage 3V - I reached a current consumption of 0.5A and the overload suddenly disappeared... currently leg 8 of PQB12 with respect to ground has a resistance of 250 ohm

Does it bother you that the new PUB01 has not been soldered yet?

With that resistance the short circuit is still present.
Repeat the injection and, after 5 minutes, check if any components heat up.

I soldered PUB01 - can I leave it?

Yes, you can.

I reached 10V .. current consumption 0.01 ... nothing heats up ...

Increase the voltage limit to 19V.

at 19V nothing happens either ...
resistance relative to PRB01 to ground 176kohm

The resistance seems fine now.
Supply the board with the service power supply set to 19V and current limit to 0.2A and test the board.
If the board respond to pressing on the power button, rise up the current limit to 2A and test the board again.

The laptop started up. Unfortunately, it does not charge the battery. He sees it in the bios, status charging, health: excellent - but 0% and he doesn't want to be there anymore
Power supply detected correctly

Measure the voltages to ground on all pins of battery connector with and without battery connected (power supply connected all the time).

without battery:
1-0.18V
2-0.18V
3-0.18V
4-3.3V
5-3.3V
6-0V
7-0V
8-0V
9-0V
10-V

with battery:
1-8.6V
2-8.6V
3-8.6V
4-0V
5-0V
6-3.3V
7-0V
8-0V
9-0V
10-0V

Install a Battery Mon software and post a screen of "Battery Info" with the battery + power supply connected.

current battery status in BIOS has changed from charging to idle