• Monitor ViewSonic vx2235wm-4 uszkodzony zasilacz.

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Monitor ViewSonic vx2235wm-4 uszkodzony zasilacz.

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#1 Monitor ViewSonic vx2235wm-4 uszkodzony zasilacz.

by Hybrid • 11 December 2012, 01:13
Witam.
Podjąłem próbę naprawy zasilacza od monitora Viewsonic vx2235wm-4.
Uszkodzony był LD7575 i kilka części w koło niego.
Po wymianie uszkodzonych elementów na nowe i sprawdzeniu pozostałych, zasilacz dalej nie startuje.
LD7575 Pozostaje w trybie off i nie steruje tranzystorem.
Napięcia LD7575:
Pin 6 - 9.7v (według datasheet powinno być około 16v)
Pin 8 - 330v
Wymienione:
C801
R806
R807
R809
R833-R836
Q801
Z803
Proszę o pomoc.
Image

Re: Monitor ViewSonic vx2235wm-4 uszkodzony zasilacz.

by Google Adsense [BOT] • 11 December 2012, 01:13

#2 Re: Monitor ViewSonic vx2235wm-4 uszkodzony zasilacz.

by zbyszkok • 11 December 2012, 02:20
A tlp jest sprawny ?

#3 Re: Monitor ViewSonic vx2235wm-4 uszkodzony zasilacz.

by amorphe • 11 December 2012, 08:06
Dodatkowo do sprawdzenia i ewentualnej wymiany C810 oraz profilaktycznie do wymiany D807.
Rezystor R811 sprawny ?
Jeszcze pytanie, czy kolega sprawdza zasilacz solo ze sztucznym obciążeniem, czy podpięty pod resztę monitora ?

#4 Re: Monitor ViewSonic vx2235wm-4 uszkodzona przetwornica.

by Hybrid • 11 December 2012, 10:40
Tlp sprawny, R811 i C810 wymieniony. Sprawdzam sam zasilacz. Brak napięć po stronie wtórnej.
Dorzucam schemat całego zasilacza i inwertera.

Image

Image
Według datasheet, Ld7575 Pinem 6 ma ładować kondensator c810 i po osiągnięciu ok 16v układ zaczyna sterować tranzystorem.
Jednak na pinie 6 jest tylko 9v.
Co może być przyczyną?

Re: Monitor ViewSonic vx2235wm-4 uszkodzona przetwornica.

by Google Adsense [BOT] • 11 December 2012, 10:40
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