Jump to content
ELFORUM - Forumul electronistilor

Sursa Vestel 17PW25-4 probleme dupa supratensiune


Recommended Posts

Buna. Am la depanat un TV, cu sursa din titlu. Am gasit schema pe net insa am ceva probleme si nu ii dau de cap. 

 

Initial am gasit IRFplesnit (Q908) si ceva diode 4148. momentan sunt date jos, insa nu merge nici partea de ST_BY. Am schimbat IC800 cu unul nou (defectu se manifesta la fel), am verificat condensatorii si sunt buni, am dat jos Q809 ca sa ma separ de Vcc2 si tot  nu vrea sa plece. La conectarea la retea tensiunea de 5V pulseaza si nu sta mentinuta. Daca din sursa de laborator ii dau o tensiune de 5V peste ea (ma refer in secundar), tensiunea +5Vstby se mentine si totul pare ok dupa ce deconectez sursa exterioara. Mentionez ca optocuploarele sunt bune.

 

Rog un mic ajutor in depanareea partii de st-by  pentru inceput

multumesc

Link to comment
  • Replies 16
  • Created
  • Last Reply

Top Posters In This Topic

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.Terms of Use si Guidelines