• Laptop Lenovo 330-15IKB MB: NM-B451 rev. 1.0 - PU301 próbkuje..

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#1 Laptop Lenovo 330-15IKB MB: NM-B451 rev. 1.0 - PU301 próbkuje..


by HotIce 24 October 2024, 18:46
Cześć,
W laptopie podczas próby zwarciowej grzała się mocno PU301, znalazłem zwarty PC307. Po wymianie na sprawny i podaniu zasilania do gniazda słychać cykanie PU301 i skokowo pojawia się napięcie na bramce PQ311 ale wpięcie się zasilaniem 19v w PJ301 sprawia że pobór prądu przez płytę wynosi 15mA, nic nie "cyka", są napięcia 3.3v i 5v a płyta startuje normalnie, jest obraz na matrycy. Co z tym problemem dalej począć?

Re: Laptop Lenovo 330-15IKB MB: NM-B451 rev. 1.0 - PU301 próbkuje..


by Google Adsense [BOT] 24 October 2024, 18:46

#2 Re: Laptop Lenovo 330-15IKB MB: NM-B451 rev. 1.0 - PU301 próbkuje..


by tekort 24 October 2024, 19:18
Zacznij od wymiany PU301, możliwe że "dostał" gdy padł PC307 i teraz nie jest w stanie odpowiednio podawać mocy.

#3 Re: Laptop Lenovo 330-15IKB MB: NM-B451 rev. 1.0 - PU301 próbkuje..


by clops35 25 October 2024, 00:06
Cześć,
zmierz rezystancję pomiędzy n.1-2 PU301.
Jeżeli będzie przejście (0Ω) podłącz zasilacz i zmierz napięcie na n.1, 2, 4, 5, 6, 24, 25 i 28 PU301, oraz PL302.

Sprawdź czy PR314 ma 10Ω.

#4 Re: Laptop Lenovo 330-15IKB MB: NM-B451 rev. 1.0 - PU301 próbkuje..  [SOLVED]


by HotIce 25 October 2024, 10:47
przepraszam, mój błąd, miałem nastawione 19v na zasilaczu a przecież to lenovo i powinno być 20v, choć dziwi mnie że tak różnica 1v miała takie znaczenie... w każdym razie po podaniu 20v nie próbkuje i działa.

Re: Laptop Lenovo 330-15IKB MB: NM-B451 rev. 1.0 - PU301 próbkuje..  [SOLVED]


by Google Adsense [BOT] 25 October 2024, 10:47

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