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ROADSTAR-problema sursa


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sasiu 11ak08: procesor ctv351s, jungla tda8361a, cadre tda3653b, sursa tda4605+buz90. lipsa tensiunilor la iesirile sursei; am schimbat tda4605, am verificat toate piesele aferente lui, inlocuit conzii electrolitici, nimic...cu ups 001 tv-ul functioneaza normal. suspectez chopper-ul, a doua infasurare are 0,1 ohmi. clientul spune ca se oprea din ce in ce mai des pana nu a mai pornit... ce parere aveti? chopper-ul este capsulat.

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Verifica tensiunea de start pe pinul 6-tda4605, posibil sa ai rezistorul de 75k/2w intrerupt(parca R807 sau R808 nu mai stiu exact) si d806 1n4148 in scurt sau rezistenta inversa. Bine ar fi sa verifici si R809-0.47ohmi, R805-330k si d808-ba159.

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