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Schema TV Hitachi 40HBT42A


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Va salut din nou ! astazi am verificat led-urile backlight si se aprind pentru aproape o secunda apoi se sting ( toate led-urile) , pe conectorul CN 12 am Dimming = 3,3 V  , Backlight pe ON = 5 V , in Stand by 0 V,  Stand by  = 12 V permanent ...pe Q 43 din mainboard apar 12 V cand TV este ON ....in schema sunt cateva posibile defecte ce fac referire la verificarea unor tranzistori si sigurante de pe mainboard dar banuiesc ca daca am verificat direct pe CN 12 (conectorul de iesire ) si am tensiunile , inseamna ca isi fac treaba . Placa de alimentare este Vestel 17 IPS 12....nu am schema , din ea pleaca alimentarea led-urilor .

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