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Nonny149

Rezolvare defect si tragere in banda Tv hitachi model c2874

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Acest tv provine din anglia,si in urma verificarilor am constatat defect baleiaj vertical si lipsa receptie in banda fif. Pentru rezolvarea defectului am inlocuit CI LA7838. Pentru tragerea in banda am schimbat selectorul original FL2178/84 cu un selector UV916.In modulul AFI-CC am inlocuit filtrul SFE-6MHZ cu un convertor prevazut cu cuartz de 500 khz. Dupa aceasta inlocuire televizorul functiona cu sunet BG-DK dar memora doar in banda UIF. Pentru rezolvarea acestei probleme am eliminat strapurile care puneau la masa pinii 10 si 12 de la procesorul de comenzi tip ST63T85B1/ZY si am aplicat tensiunea de 5v prin 2 diode 1N4148. Programarea si memorarea am facuto cu o telecomanda universala tip MAXI-2006. Memorarea se face prin apasarea simultana a tastelor shift si ok.

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