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Megavision DMQ2042


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Buna ziua!Acest tv cu sasiu c50 are ceva probleme ,si anume a fost dus BU D1555 si STR50103A apoi s-au schimbat C435 22uf/160v  si C419 ,47uf160V ambele.si c830 1uf/160v.

si o rezistenta R831 inseriata cu C830 de 36ohmi.

Cu toate acestea cu becul montat am 78V .si daca pun si BU tv vrea sa pornesca dar tiuie trafo choper de alimentare si tensiunea scade la 45V.

Ce poate fi?Astept idei ,va multumesc!

 

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Mai relevanta ar fi proba cu o rezistenta de 50-100 ohmi (10-15W) in serie cu alimentarea transformatorului , in felul asta vezi daca rezistenta se incalzeste, in cazul unui consum in B.O. si daca tensiunea pe iesirea sursei mai scade tot atat de mult.

 

La modelul asta am intalnit bobina de deflexie arsa in totalitate, ca nu mai apuca imaginea sa apara ingusta pe orizontala, cum se intampla de obicei. 

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Varianta cu rezistorii se foloseau si la tv cu lampi,si apoi sa intervenit cu becul cea ce nu este rau pentru ca urmaresti ochiometric dupa filament (maxim 70 wati).Acum in cazul d-tra eu cred ca trebuie sa verificati consumatorii auxiliari ai trafului de linii,si dupa: sursa nu debiteaza conform consumului total.Este doar un sfat si nu o rezolvare,in rest va doresc succes.!

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