• ASRock Z270 PRO4 - 5V STB wariuje

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#1 ASRock Z270 PRO4 - 5V STB wariuje


by ocho8 16 March 2022, 00:21
No jak w tytule, 5VSB skacze od 0.6v do 1.5v. Zauważyłem jeszcze że 3VSB_A jest zwarte do masy, ale nie wiem może tak to powinno być.
Po zwarciu pinu PS_ON do masy; zasilacz oczywiście startuje, dość odczuwalnie grzeje się regulator GS1085LXF SOT-223 GS (na boardview: PQ23). Ten że regulator ma wyprowadzenia na 3VSB_A oraz na 5V STB więc myślałem że on powoduję te zawirowania. Niestety po jego wylutowaniu nic się nie zmieniło, 5VSB nadal wariuje, 3VSB_A nadal zwarte do masy.
Po optycznej analizie płyty nie dostrzegłem żadnych fizycznych uszkodzeń, w szczególności przyjrzałem się ww. liniom 5VSB oraz 3VSB_A.

Nie mogłem nigdzie znaleźć żadnej dokumentacji do tej płytki więc używam boardview od ASRock H270 PRO4 (dodałem schemat tutaj na forum, jak moderator zaakceptuję to będzie), pewny nie jestem ale obie płytki wyglądają na lustrzane konstrukcje.

Każda pomoc mile widziana :D

Re: ASRock Z270 PRO4 - 5V STB wariuje


by Google Adsense [BOT] 16 March 2022, 00:21

#2 Re: ASRock Z270 PRO4 - 5V STB wariuje


by matic 22 March 2022, 15:38
Hello!

What are an actual resistances to ground on pins 2, 3 of chip PQ23?

#3 Re: ASRock Z270 PRO4 - 5V STB wariuje


by ocho8 15 April 2022, 11:51
pin 2 is pretty much shorted to ground (0 ohm displayed on my multimeter)

pin 3 have 575k ohm

#4 Re: ASRock Z270 PRO4 - 5V STB wariuje


by matic 16 April 2022, 11:22
Remove the chip PQ23 from the board and perform a short circuit test described here on pad 2 on the place of chip PQ23. Limit the voltage to 3V.

The PCH chip is very likely damaged.

Re: ASRock Z270 PRO4 - 5V STB wariuje


by Google Adsense [BOT] 16 April 2022, 11:22

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