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adrianvmx

Tv sasiu chinezesc th2105f

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Am o problema cu acest tv (proc LC863532C , JUNGLA LA76810A , TRF BSC24-01N40 ,BALEAJ V. LA7840. In prima instanta au fost defecte condensatoarele de pe ramura 110 v 24 v 180 v (umflate ) Le am schimbat tensiunile ok toate bune o saptamana cand ma trezesc cu el in atelier de data asta toate condensatoarele din secundar sursa umflate procesor praf , baleaj verticala praf etc. Am inlocuit componentele defecte cu toate ca erau destule dar au preturi mici si tensiunile acum sunt normale .Am schimbat preventiv optocuplorul semireglabilul R551 bias sursa am verificat r554, r552, r555 tranzistorul v553, vd 561componentele din sursa par ok .Va rog cateva sfaturi cu privire la sursa acestui tv ...din ce cauza se mareste tensiunea din secundar in asa fel incat face ravagii banuiesc ca este un defect tipic al acestor aparate .

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Schimba v511 ! 2sa1013 !

:aplauze In sfarsit, cineva care stie. Asta trebuia facut din prima. Acest tranzistor este CAUZA care duce la cresterea necontrolata a tensiunilor din sursa in stand-by. Nu trebuie masurat, trebuie SCHIMBAT cu 2SA1013. Valabil la TOATE sursele cu schema similara din tv China.
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