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lebensborn62

invertor lcd

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buna ziua , caut si eu schema invertorului model 715L 1140-1A , echipat cu 4 tz. comutatori din seria "D" ( carcasa asemanatoare cu BD ) si niste ci tip LM339 si 393

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Ce e problema cu el? Vreun tranzistor ars? Posibil unul dintre trafo ...defect!! Puteti ori sa schimbati trafo ;ori adaptati un alt invertor...Schema...exacta.... :nas: ?!?!?!

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am gasit schema gratis :da , as avea o intrebare : cum sa-i dezacivez proectia daca suspectez o lampa obosita ? Prin marirea sau micsorarea uneia din cele 6 rez de 1K care corespund celor 6 lampi ? Simptom : functioneaza perfect un timp ( daca e rece - 3min) dupa care se stinge display-ul .monitorul este : LV20E351 ...dar nu reusesc sa atasez schema :jytuiyu

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am procedat in felul urmator : am eliminat main board , am identificat pinul on/off si am aplicat pe intrarea asta un 3,1 V ( cat dadea main board cand deschidea invertorul ) . Am observat ca acum merge mult mai mult ( 10 min ) dar dupa asta , incepe un dans on/off continuu ; daca il las asa dansand , dupa o vreme , iarasi sta aprins si ciclul se repeta . Unul din cele 2 trafo se pare ca se incalzeste un pic mai tare decat celalalt , dar aprecierea asta e totusi subiectiva .

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OK , le-am verificat cu unul din ala mic de la Mivarom masurand curentul absorbit de invertor , la una mi s-a parut ca ia cu 30 mA mai mult decat celelalte , nu stiu ce sa zic , nu-a chiar ( inca ...) expert in astea si un alt invertor mai bun nu am momentan

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Daca reduci luminozitatea sub 50% se mai sting ?Cu ce controler este echipat ?

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