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Goldstar CF 20A80B SASIU MC-41B


Guest B_Ioan

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Guest B_Ioan

Buna ziua,Am si eu o problema cu un Goldstar CF 20A80B SASIU MC-41B, sursa defecta am schimbat STR-S6707, Q805 cu BD681, ZD811(6.8v) , optocuplorul, SE110N, Rezistenta R826(18r), C820, C826, C825, alte piese nu am gasit defect. In secundar totul pare ok cu toate acestea STR-S6707 se incinge foarte puternic dupa circa 5 min intra in blocaj termic. Tensiunea in St-by =36v in funct= 109vMentionez ca am incercat 3 STR-S din loturi diferite.Altceva nu gasesc defect , va rog poate puteti sa imi da-ti alte idei, in cele 5 min de functioare tv-ul lucreaza ok.

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Guest B_Ioan

Am decuplat finalul linii si am pus bec de 60W in loc, am decuplat baza tranzistorului Q804 ca tv-ul sa nu intre in st-by.Valorii : C805- 9v C830- 11v C815- 53v C814- 108Vpe STR-s am urmatoarele valori : pin 1= 290v 2= 0,05v 3=0,21v 4=0,27v 5=0,6v 6= 0 7=0,28v 8=0,92v 9=6,9vSTR-ul se incinge si in cazul asta (cu bec)

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Guest B_Ioan

R826 ce valoare are 18 r sau 18k ? pe schema am vazut ca e 18r dar in alta documentatie am gasit ca ar fi data de 18k. Eu am pus de 18r.

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Guest B_Ioan

e schimbat deja, am schimbat toti condensatorii"[...] sursa defecta am schimbat STR-S6707, Q805 cu BD681, ZD811(6.8v) , optocuplorul, SE110N, Rezistenta R826(18r), C820, C826, C825 [..]"

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Guest B_Ioan

Am observat si eu ca tensiunile sunt un pic diferite fata de schema, dar nu gasesc nimic defect si am schimbat 3 STR-uri din loturi diferite.Altceva nu stiu ce sa mai caut

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"Tensiunea in St-by =36v in funct= 109v" - ceva nu'i in regula aici .

Tens secundare ale trafo chopper t802 sint; pin14 U1=56v st-by U1=112v pw(D806,C814-220v/160v+C827-100mf/160v), pin13=48v>D807,C815-10mf/100v pin11=12v>D805,C830-470MF/35V + 5v 7805 pin8=25v>D801,C805-1000mf/35v si opto pin1=48v8 pin2=50v.

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