validae Posted February 28, 2014 Share Posted February 28, 2014 Va salut, am la serviciu tv-ul unui coleg, un Teletech sasiu 11AK30A11 si nu-i dau de cap. Ledul e rosu si la apasarea tastei P+ palpaie usor fara sa treaca pe verde. Inalta nu porneste.Am gasit condensatorul din baza lui BU808 cu ESR-ul marit rau, si l-am schimbat restul sunt OK la verificari. Tranzistorul e bun, l-am dat si afara sa ma conving, cu becul in locul lui ori fara bec, bara B+ nu scoate 110V. Link to comment
elmar Posted February 28, 2014 Share Posted February 28, 2014 Scoateti MCR-ul si porniti sursa cu bec c-e final linii... Link to comment
santamihai Posted February 28, 2014 Share Posted February 28, 2014 viewtopic.php?f=17&t=124195 Link to comment
validae Posted February 28, 2014 Author Share Posted February 28, 2014 Am intrerupt conexiunea de colector a finalului linii si pus bec cu MCR scos porneste si scoate ce trebuie, 5V , 8V si 110V. Link to comment
santamihai Posted February 28, 2014 Share Posted February 28, 2014 Schimbati intai C619 100nF . Link to comment
elmar Posted February 28, 2014 Share Posted February 28, 2014 conectati finalul linii si incercati sa porniti tv-ul asa...(fara MCR) Link to comment
validae Posted February 28, 2014 Author Share Posted February 28, 2014 Multumesc de informatie, stiam ceva de acel condensator da se pare ca nu ma-nvat minte Link to comment
validae Posted February 28, 2014 Author Share Posted February 28, 2014 Totusi, cu tranzistorul conectat si MCR-ul scos, sursa tacane a scurtcircuit.Cred ca tot tranzistorul final linii face figuri desi l-am scos si testat cu un bec, dar la 12V doar.Polarizat cu o rezistenta se deschide si-mi aprinde becul. C619 e in regula, l-am scos si verificat. Link to comment
santamihai Posted February 28, 2014 Share Posted February 28, 2014 Ceva asemanator am avut recent si buba a fost condensatorul de 4700 micro .Dupa inlocuire tv a pornit fara sa mai tacane se sa clipeasca led-ul rosu . Link to comment
elmar Posted February 28, 2014 Share Posted February 28, 2014 e posibil sa aveti finalul linii defect ...dar mai verificati daca nu aveti scurt pe alimentarea finalului cadre... Link to comment
santamihai Posted February 28, 2014 Share Posted February 28, 2014 Tensiunea de 8V cum este? Link to comment
validae Posted February 28, 2014 Author Share Posted February 28, 2014 Si eu cred ca-i tranzistorul, chiar daca l-am probat afara cu un bec la 12V, probabil strapunge la tensiune nominala.Din pacate nu am altul la indemana, aici la serviciu ,,repar trenuri,, vorba unui coleg Tensiunile de 5V si 8V sunt OK. Cum scot tranzistorul, nu mai tacane sursa. Link to comment
santamihai Posted February 28, 2014 Share Posted February 28, 2014 2SC5388 sau daca nu faceti unul viewtopic.php?f=16&t=134367&hilit=BU808&start=75 Link to comment
BUGHIU Posted February 28, 2014 Share Posted February 28, 2014 Asta: ...dar mai verificati daca nu aveti scurt pe alimentarea finalului cadre...sau mai rau ; trafo linii.......memoria ?Nu cred ca e BU808DF ....vinovat,parerea mea Link to comment
validae Posted February 28, 2014 Author Share Posted February 28, 2014 Tocmai ma apucasem sa improvizez unul dintr-un BU508 si ce-oi mai gasi pe-aici Link to comment
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