DELL Insprion-7577 brak obrazu

WItam. Laptop przyszedł do mnie z uszkodzonym (dziura) układem JHL6340 (thunderbolt). Po wymianie układu na nowy płyta się uruchamia. Napięcia pojawiają się na wszystkich cewkach oprócz CPU. Brak ładowania baterii:



Pobór prądu po podłączeniu zasilacza to ok 370mA bez wentylatorów. Gdy podłącze wentylatory to uruchamiają się na maksa. Grafika robi się ciepła.

Płyta: cka 50/ckl50 la-e992p

Co dalej?

Hello!

Measure the voltages to ground on pins 12, 13, 25, 26, 27, 35, 41, 42, 43, 44, 45, 46, 47, 48 of chip PU5000.

Check the pd controller UT4 for damage, I've faced multiple la-e991p & 992 that doesn't initialize because of damaged pd controllers !

and make sure the same chip with exact letters is installed, it doesn't init with different chip..

TPS65982DA should be there if i remember correctly..

matic napisał(a):Measure the voltages to ground on pins 12, 13, 25, 26, 27, 35, 41, 42, 43, 44, 45, 46, 47, 48 of chip PU5000.

12 - 0V
13 - 0V
25 - 0V
26 - 0V
27 - 0V
35 - 2.3V
41 - 19V
42 - 5V
43 - 1V
44 - 1V
45 - 1V
46 - 1V
47 - 13mV
48 - 0V

Measure the voltages on all pins of UZ21.

mohammedsf napisał(a):Check the pd controller UT4 for damage

Mogę go wylutować i uruchomić płytę?

Pomiary UZ21:

1 - 3.3V
2 - 1.4V
3 - 0V
4 - 0V
5 - 3.3V

Set your multimeter to the diode test mode and measure the voltage drops to ground on listed points with the positive (red) probe connected to ground:
- On pin 2 of chips PU25V00, UZ21.
- On pin 3 on the place of chip UTPM1.

pin 2 UZ21 - on diode mode is open, resistance - 760ohm
UTPM1 is not present on my board.

Program bios with known working image to Rule out BIOS issue first

domo997 napisał(a):pin 2 UZ21 - on diode mode is open

And with the reversed polarity of test leads?

domo997 napisał(a):resistance - 760ohm

This resistance seems suspiciously low.

domo997 napisał(a):UTPM1 is not present on my board.

I know that and that's why I wrote "on the place of chip".

Przepraszam, źle zrozumiałem co mam zmierzyć. Poniżej prawidłowe pomiary:

matic napisał(a):Set your multimeter to the diode test mode and measure the voltage drops to ground on listed points with the positive (red) probe connected to ground:
- On pin 2 of chips PU25V00, UZ21.

0.2V

matic napisał(a):- On pin 3 on the place of chip UTPM1.

0.53V

ERRA napisał(a):Program bios with known working image to Rule out BIOS issue first

Niestety dalej to samo.
Ponawiam zapytanie czy mogę diagnostycznie wylutować układ UT4 i uruchomić płytę?

domo997 napisał(a):

matic napisał(a):Set your multimeter to the diode test mode and measure the voltage drops to ground on listed points with the positive (red) probe connected to ground:
- On pin 2 of chips PU25V00, UZ21.

0.2V

I asked about measurements on two chips, but you only provided one measurement.

Also remeasure the resistances to ground on the same points.

matic napisał(a):Set your multimeter to the diode test mode and measure the voltage drops to ground on listed points with the positive (red) probe connected to ground:
- On pin 2 of chips PU25V00, UZ21.

PU25V00 = 0.47V (22k)
UTPM1 = 0.2V (500Ohm)

And again the measurements on pin 2 of chip UZ21 are missing.

In post #11 you specified different voltage drops:

domo997 napisał(a):

matic napisał(a):...
- On pin 2 of chips PU25V00, UZ21.

0.2V

matic napisał(a):- On pin 3 on the place of chip UTPM1.

0.53V

Which measurements are correct?

- On pin 2 of chips
PU25V00: 0.46V
UZ21: 0.2V
- On pin 3 on the place of chip
UTPM1: 0.53V

Jeżeli to coś pomoże to zrobiłem test portu USB-C (ładowania) w taki sposób:

Podłączyłem zasilacz pod laptopa i wpiąłem telefon poprzez USB-C i telefon zaczął się ładować

Czy macie jeszcze jakieś propozycję jakie wykonać kolejne kroki w celu naprawy płyty? Pozdrawiam

Measure the resistance to ground on pin 2 of chip UZ21.

matic napisał(a):Measure the resistance to ground on pin 2 of chip UZ21.

770ohm

The resistance and voltage drop to ground on pin 2 of chip UZ21 are too low.
Open (cut) the jumper RT110 and remeasure the resistance to ground on pin 2 of chip UZ21.