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tv LG model CF-20D16X


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salutare la un tv LG model CF-20D16X pe alim cu str s5707 si 24c02,tda8362b, lg8634-20b, are urmatorul sintom,nu porneste din tlc adica dai comanda se stinge ledul din st-by si revine imediat,am sa verific cond pe alim si lipituri recice tz merge in loc de c5250?bu 508df e bun?multumesc de ajutor,revin

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salutare la un tv LG model CF-20D16X pe alim cu str s5707 si 24c02,tda8362b, lg8634-20b, are urmatorul sintom,nu porneste din tlc adica dai comanda se stinge ledul din st-by si revine imediat,am sa verific cond pe alim si lipituri r

_____________________________________________________________Sursa defecta>respectiv partea primara;INLOCUITI cu piese NOI>C824-4,7mf/50v,C820+825-220mf/35v si prentiv C408-1mf sau 2,2mf/160v din alimentare trafo driver.Scaderea capacitatii c-urilor mentionate din sursa primara ,face ca integratul STR-S5707 sa nu oscileze corect in sarcina(la comanda ON led-ul se aprinde si se stinge imediat>deci NU se genereaza tensiunile corecte in trafo Chopper primar necesare ptr.tensiunile secundare25v,14v4>5v,110/123v>33v.Tensiunile corecte in pinii ci STR-S5707 sint;pin1=304v...2,3,5=0v02...4=0v1...6=min necesar1v5/2v...7=32v...8=0v2...si 9=9v.Daca in pin6 nu sint min 1v5/2v-respectiv in pin5 optocuplor ,sursa se opreste pe sarcina.Tensiunile pe tranz.Q810-2sc1026y trebuie sa fie b=7v45,c=32v,e=9v.Comanda st-by/on-off se realizeaza de traz.Q803 comandat in baza de procesor pin22 care la rindul lui comanda pin2 opto cu referinta Vcc pin1 din bara secundara de 14v4( sau o tensiune mai mica de 12v in pin1 opto nu regleaza oscilatorul din primar ptr. factor de putere(umplere).ETC...
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