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probleme cu adaptor model k-1205 pentru monitor lcd horizon


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salutare, am si eu o problema cu un adaptor pentru monitor, adaptoru este model k-1205 scoate 12v si 4.2A, problema este urmatoarea: nu are curent constant de 12v, are 12volti scade la 5-6 volti. iar urca la 12volti, iar scade la 5-6 volti, schimbarea de la 12 la 5-6 volti si viceversa se face rapid, adica nu sta mult la 12 volti si dupa acea sa scada, cateva secunde dureaza un ciclu, ledul verde palpaie, se aprinde cand urca la 12, se stinge cand scade la 5-6 volti, stie cineva ce ar putea fi? multumesc

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