Acer Aspire V3-771 - nie uruchamia się / chyba uszkodzony PCH

Acer Aspire V3-771 G
VA70/VG70 rev 2.1

Po podłączeniu zasilania płyta sama stratuje z poborem około 1.1A. Na cewkach zaznaczonych na zdjęciu brak napięć oraz rezystancja do masy wynosi 3.2Ohma na obydwu. Most bez chłodzenia ma około 60C. Na pozostałych cewkach napięcia obecne.
W innych slotach RAM płyta startuje sama do około 1.1A i się wyłącza po czym następuje ponowne uruchomienie i tak w kółko.
Czy po tych objawach i pomiarach mam wnioskować że most SLJ8C jest uszkodzony i należy go wymienić?

Hello matic!
I was try to reflash BIOS and EC the same dump file but effect is the same. Maybe I must try refresh other dump file?

Today I connected the board and it takes about 500mA for 1-2s and it restarts over and over again. During this time, the PCH will have time to heat up to 50-60C.
It's the same without the CPU.
Replace PCH?

I replaced the PCH bridge with a used one, I did not notice it heating up. However, the motherboard still does not start. After connecting, it starts up by itself with a consumption of about 300mA, the switch diode and the powe diode on the board turn on and off, the LED diodes in the RJ45 socket turn on and off.
The voltage of 3V and 5V drops during the retart, or rather it should be all the time.

After about 2 minutes of such reboots, the GPU core is around 50C

So, before the replacement, the board consumed 1.1A, but the next day when I connected the power supply, the board started by itself and consumed 300-400mA and restarted. Then I replaced the PCH and it is still the same, it starts by itself with a consumption of 300-400mA and restarts (on the beginning after replacing the PCH it took about 10-20mA and it did not start, then it started to start from 300-400mA - that's weird!)
On the coin from 3V and 5V there is 3V and 5V, but when the board restarts, these voltages drop to about 0V and increase again to 3V and 5V. I don't remember the resistance at 3V and 5V but it was in kΩ.


Motherboard without CPU and RAM when trying to boot in basically only the GPU core warms up around 40-50C, is this normal? should the GPU start already with such a low power consumption? Maybe the GPU is damaged? Elsewhere, the motherboard does not get warm.
I have 18Ohm on the GPU coils