Acer Aspire A715-41G - brak obrazu po włączeniu

Witam.
Oznaczenie płyty głównej FH5VQ LA-J812P REV: 1A. Po włączeniu płyta pobiera 1,65A, pomieniłem ram, przeprogramowałem układy UC7, UV49 i kbc, wykorzystałem też wsady z elvikomu - bez zmian. Matrycę dla pewności podstawiłem drugą - bez zmian. Poniżej podaję rezystancję i napięcia na poszczególnych cewkach i proszę o dalsze wskazówki:
PL301 - 13kΩ; 3,4V
PLB2 - 575kΩ; 0,21V
PL501 - 16,2kΩ; 5,16V
PLW1 - 132Ω; 1,22V
PLV3 - 0Ω; 0,73V
PLV2 - 0Ω; 0,73V
PL1802 - 7,2ΩkΩ; 1,85V
PLF2 - 60Ω; 0,94Ω
PLZ6 - 3Ω; 1,16V
PLZ4 - 3Ω; 1,16V
PLZ5 - 3Ω; 1,16V
PLA3 - 3,5Ω; 1,02V
PLM1 - 176Ω; 1,22V

arjuredi написав:PLV3 - 0Ω; 0,73V
PLV2 - 0Ω; 0,73V

Hello!
Are these measurements correct?
Did you measure the resistances with the power supply disconnected from the board?

I measured the resistance with the board disconnected from the power supply, and the voltage was measured after switching on the board.

Are you sure there is 0Ω resistance (dead short circuit) to ground on coils PLV2, PLV3?

I checked again and I have 0.8 Ω on both coils, but the resistance on the probes is 0.4 Ω, so the coils are 0.4 Ω.

So is the voltage of 0.73V correct?

arjuredi написав:so the coils are 0.4 Ω.

This resistance is definitely too low.
Remove the coils PLV2, PLV3 from the board and check on which side of the coils is low resistance to ground.

After removing both coils, I have such a small resistance from the VGA chip side. On the other hand, I have a resistance of 320 kΩ.

arjuredi написав:After removing both coils, I have such a small resistance from the VGA chip side.

Perform a short circuit test described here on the pad with low resistance. For a short circuit test limit the voltage to 1V.

The GPU chip is very likely damaged.