Lenovo Legion Y530-15ICH zwarcie na PL1801 - nie widzi GPU

Witam

Laptop Lenovo Y530-15ICH
Platforma: EY515/EY517/EY519/EY520 NM-B701 REV 1.0
CPU: SR3YY
PCH: SR40B
GPU: N17P-G1-A1

Laptop uruchamia się po dłuższej chwili, uruchamia się windows10 i działa ale w menedżerze urządzeń w ogóle nie widzi grafiki GeForce (brak wykrzyknika ani pozycji, jest jedynie grafika Intela). Zauważyłem brak napięcia na PL1801 i szybko grzejący się PU1801. Po podniesieniu PL1801 niska rezystancja ustała po stronie zasilania ale została po stronie obciążenia. Idąc dalej rozwarłem zworę PJ1801 - dalej 0,3 Ohma po obu stronach zwory.

Bardzo proszę o podpowiedź czy to świadczy o zwarciu na GPU ?

soczek42 napisał(a):Idąc dalej rozwarłem zworę PJ1801 - dalej 0,3 Ohma po obu stronach zwory.

Hello!
Are you sure there is a low resistance to ground on both pads of this jumper? Are you sure the jumper is opened?

Yes i am sure. Jumper is opened (checked with a microscope) and low resistance is on both pads

There are two jumpers connected in parallel - PJ1801 and PJ1802 due to higher current capacity.
It's necessary to open both of them

Yes it's true - there are two jumpers. After open PJ1802 the low resistance is on the PJ1801 pad closer to the UV8 RAM bone

soczek42 napisał(a):After open PJ802 the low resistance is only on the PJ801 pad closer to the UV8 RAM bone

It's the system side of the jumper.
Perform a short circuit test described here on shorted pad of this jumper. For a short circuit test limit the voltage to 1V.

I did a short-circuit test but I can't find any hot element. I gave 1V and 5A for a long time and nothing. I have wires soldered from the service power supply

Did you use a wire of at least 1mm Square?
What voltage do you measure on the board at the current injection point?

Yes I you use a wire of 2mm Square. on the board at the current injection point i have 0,03V (measured with a multimeter) but in power supply on LCD i have 0,5V and 5A

soczek42 napisał(a):on the board at the current injection point i have 0,03V

Are you sure the positive (+) wire is not in contact with ground at the injection point on the motherboard?

If so, it's necessary to perform the short circuit test at greater current. Sometimes it's need to go up to 10A or even more to find a shorted component.

Yes I am sure the positive (+) wire is not in contact with ground.

I have two power supplies, each can give a maximum of 30V 5A. Can I somehow connect them together to get a total of 10A and 1V?

soczek42 napisał(a):I have two power supplies, each can give a maximum of 30V 5A. Can I somehow connect them together to get a total of 10A and 1V?

Yes, of course.
Set the same voltage (1V) on both power supplies and connect them in parallel as shown in the following picture.

Uszkodzony okazał się układ GPU. Dziękuję za pomoc!