Dell Inspiron 15 3511 - brak startu, grzeje się charger

Do you have an oscilloscope?
If so, measure the voltages to ground on pins 4, 5 of battery connector with an oscilloscope with and without battery connected (power supply connected all the time).

below are the measurements:

pin4 with battery:


pin5 with battery:


pin4 without battery:


pin5 without battery:

Do you have a Svod 3 or Svod 4 programmer?

Unfortunately, I don't have svod 3/4. If it's a matter of reprogramming the KBC, I think I would try to outsource the programming to someone who has... Does SVOD 3/4 support MEC1515?

pawel1978 wrote:If it's a matter of reprogramming the KBC...

No, it isn't. It matter of a battery test that can be performed by connecting the battery to the Svod 3/4 programmer.

Without the Svod programmer, I can suggest you to test the machine with another battery.

Another battery was installed. Its charge level is 69% - Excellent status - in the BIOS after connecting the power supply, information about charging/after disconnecting idle. Unfortunately, still no charging. At rest, power consumption is 0.00 - 0.01

Repeat the test suggested in post #19 with another battery.

with battery:
1-11,3V
2-11,3V
3-11,3V
4-3,2V
5-3,28V
6-3.3V
7-0V
8-0V
9-0V
10-0V

and here's an interesting fact... after removing the battery, there is 18.5V on pins 1-3 for a while... after a dozen or so seconds it drops to 0.08V

Measure the voltages to ground on pins 1, 2, 5, 7, 8, 12, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 28, 31, 32 of charger chip PUB01 with the power supply + battery connected.

1, - 11,3V
2, - 11,3V
5, - 19,5V
7, - 24,7V
8, - 5,3V
12, - 10,9V
14, -0,09V
15, - 0V
16, - 2,2V
17, - 19,3V
18, - 5,3V
21, - 3,2V
22, - 3,2V
23, - 5,3V
24, - 3,1V
25, - 0 V
28, - 5,2V
31, - 11,3V
32,- 9,1V

Check PRB07, PQB11, PQB12.

PRB07 checked - 4ohm - OK
PQB11 - looks OK when measured on the board
PQB12 - desoldered to be sure and it's a strange thing... sometimes there is a short circuit between the drain and the source - other times there is about 500 ohm resistance. To be sure, I replaced it with AON7702 - unfortunately without a positive result

Measures voltage on pins 1, 4, 8 of PQB11, PQB12 (with battery and power supply connected).
Measure the resistance to ground on pin 7 of PUB01.
From schematic PRB07 = 4.02k.

Voltage:

PQB11
1- 19,6V
4-24,8V
8-19,6V

PQB12
1-19,5V
4-24,8V
8-19.7V

Resistance
PUB01
7 - high ~ 5.5Mohm

PRB07 - my mistake - it has 4kohm

14, -0,09V
15, - 0V

If you have 19v on pin 8 of PQB12 how do you have 0v on pins of PUB01?
Measure the resistance between pins 14 and 15 of PUB01.

pawel1978 wrote:PQB12 - desoldered to be sure and it's a strange thing... sometimes there is a short circuit between the drain and the source - other times there is about 500 ohm resistance.

Bridge the pins 4 and 8 of this transistor to discharge a possible charge on the gate and check the resistance between drain and source again.

Check the resistors PRB11 (1Ω) and PRB12 (2Ω).

The resistance between pin 14 and 15 is 1.5kohm.
PRB11 - measured on the board is 1.2Kokm and PRB12 - 200ohm

So the resistors PRB11 and PRB12 are definitely damaged. Replace them.
PRB11= 1Ω/5%, package 0402
PRB12= 2Ω/5%, package 0402

After replacing both resistors, unfortunately PUB01 was damaged again. Current consumption 0.16A and PUB01 is getting hot. Notebook won't start

Both resistors also damaged again.. two measurements on the board indicate 500ohm

Measure the resistance to ground of PRB02.
If it is low, test again for short circuits.