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TV hermes- lipsa rastru.


Guest Tl70Cig
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Guest Tl70Cig

Salut! Sint Gigi din Tulcea si am o problema cu un tv .Hermes ,care are componentele:c4237+js-8017;d1555;fcv-1422l01;tda 4504b;tda4650;tda3653b... Problema e ca nu am rastru . Am masurat U filament 0,98-4,6v(oscilanta); Ug1-0v;Ug2-0,8 -2v;nu am nici FIT . Am schimbat traf-ul linii cu unul nou(fcv1422l01),dar acelasi simptom.U1=85-127v.U video 127v(normal 190-200v). Ce e de facut ? Are cineva un sfat ? As dori si o schema ca nu am. Suspectez cadrele,gindindu-ma ca ar bloca U26v. E posibil ? Astept orice parere si o schema;va multumesc.

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Guest Tl70Cig

Revin cu niste rezultate si info.: tv. cu pricina,din momentul defectarii pina mi-a fost adus, a fost folosit ca radio(zice proprietara)! Eu nu i-am pus semnal.Apoi,am masurat U pe colector t final cu bec de 75w si am gasit 113v.Cu t final montat U=127v.Am si U de 15 v.U video, la fel 127v;U bv.=0;Baza t driver este comandata de tda 4504b,printr-o rez. =100 ohmi din pinul 29 unde am 0,35 v.Schimbat c-uri,re-verificat d1555,care e ok. Puteti trage vreo concluzie ? Cum verific impulsurile de comanda a lui t final caci nu am osciloscop ? Se poate fara ? Multimeterul meu masoara frecvente pina la 20Khz. Schema trimisa de ''Meta Fizica'' e partial asemanatoare ,asa ca as dori una mai aproape de ce am eu ca si componente si valori.

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Guest Tl70Cig

Problema rezolvata cu Hermes-ul ; t401 din baza t final intrerupt in primar,c410 devalorizat,c414 intrerupt.Multumesc celor care mi-au dat ''o mina de ajutor'' (sfaturi,schema) ! :aplauze

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