Asus R510J - płyta X550JX rev.2.0 - brak obrazu

Witam, laptop po wciśnięciu włącznika uruchamia się ale bez obrazu. Pobór prądu wynosi 1,73A i jest stały. Na płycie jest wbudowana pamięć ram plus jeden slot na dodatkową, gdy wyjmę tą dodatkową kość ramu to pobór prądu wynosi 0,85A i też jest stały. Na cewkach obecne są wszystkie napięcia:
PL8501 - 0,9V
PL8502 - 0,9V
PL8301 - 1,35V
PL8200 - 1,06V
PL8801 - 2,2V
PL8001 - 1,74V
PL8003 - 1,74V
PL8002 - 1,74V
PL8100 - 3,3V
PL8101 - 5V

Pendrive z diodą led podłączony do usb świeci tylko ciągłym światłem nie mruga.
Bios i KBC programowałem różnymi wsadami ale bez zmian.
Czy nakieruje mnie ktoś gdzie szukać usterki?

Does it work on an external monitor?
Measure the voltages on pins 5, 11, 12, 26, 27, 30, 33, 36 of J4501 (LCD connector).

Doesn't work on an external monitor.
I will take the measurement and send it after work

J4501 (LCD connector).
5, 3,3V
11, 3,3V
12, 0V
26, 0V
27, 0,27V
30, 19,79V
33, 0V
36, 3,3V

Is U4601 present on the card?
Measure the voltages on all pins of PQ9102.

There is no U4601 on the card

Voltages on the PQ9102:
1 - 3,3V
2 - 12,96V
3 - 3,3V
4 - 12,96V
5 - 3,3V
6- 3,3V
7 - 3,3V
8 - 3,3V
9 - 3,3V
10 - 3,3V

J4501 (LCD connector).
12, 0V

Double check this measurement. If it is 0V make a bridge with pin 36.
Measure the voltages on all pins of D4502, D4503.

I checked pin 12 on J4501 (LCD connector). This pin is not connected anywhere on the motherboard

voltages on the:
D4502
1 - 0,015V
2 - 3,3V
3 - 0,25V
D4503
1 - 3,3V
2 - 3,3V
3 - 0,25V

Measure the voltages on all pins of U0302.
Measure the voltages of R0311 or R0311 (If present on the card).
If voltage is present on pin 4 of U0302 you have a problem on the PCH.
Attempt a reflow on the PCH (you can also try to re-solder the PCH, replacement is still recommended)..

voltages on the U0302:
1 - 0V
2 - 3,3v
3 - 0V
4 - 0V
5 - 3.3v

voltages on the R0311 - 1V

You must have mismeasured the voltage on pin 4 since it is connected to R0311.
If the voltage on R0311 is correct, I confirm what was written before about the PCH failure.

I measured correctly. I am attaching a printscreen from boardview. Pin 4 of U0302 is not connected to R0311.

Measure the voltages on all pins of R0318.
From the diagram I have it is connected (via R0310).

Voltages on all pins of R0318 - 1V
resistor R0310 is not mounted.

The mystery discovered. Indeed, the diagram indicates that some components may be missing.
The power on sequence reaches the end but the PCH does not generate the signals to activate the LCD screen.
The culprit can only be the PCH.

Do I understand correctly? There should be 0V on pin R0318, then the laptop will start? PCH doesn't give this signal?

The missing signals are LCD_BACKEN_PCH, L_BKLTCTL_PCH, L_VDDEN_PCH coming from the PCH (are used to activate the LCD).

Now I understand. Machine, thank you very much for your help. I am impressed with your knowledge.
I have one more question. Do you think that reballing the PCH would solve this problem, or should I replace the PCH immediately?

You can try, maybe solve it, even if the best solution is to replace the PCH.

I reballed PCH and it didn't solve the problem. I have second motherboard X550JX rev.2.0. I want to take PCH from this board.

On this motherboar after turn on, all voltages appear. the motherboard consumes a current of 0.8A. On resitor R0318 (PCH_PLTRST_CPU) is 1V. After 10seced current consumption drops to 0.2A and board doesn't start. Do you think the PCH is also damaged or something else?

Voltages and resistance on the coils are the same like previous motherboard