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Procesor pca84c640,tda8305.Arde instantaneu dupa 5 minute de functionare tr final de linii.Acesta nu se supraincalzeste.Va rog un sfat.Tensiunea de alimentare este buna 125v.Tr D1651 cu ce l-as putea inlocui?Va multumesc!

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Schimbati toti condensatorii electrolitici din primarul sursei si cei doi condensatori de pe bara U1. Scoateti finalul linii din montaj. Puneti un bec de 60-75w in locul finalului. Lasati sursa sa functioneze, si urmariti daca in timp U1 creste. Daca ramane stabila pe 125v sursa este rezolvata. Schimbati C411, C409, si verificati R410. Montati tranzistorul si vedeti cum functioneaza.Atentie de unde cumparati tranzistorul.Daca aveti din recuperari ar fi cel mai bine. Puteti incerca si cu un 2SD2499.

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