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buna ziua va deranjez cu o intrebare am un tv zender model ft2105d am probleme cu sunetul  ,nu am sunet am schimbat doua integrate de sunet nu merge alimentare pe pinul 1 este de 13 v integratul este AN17821A eu am pus AN7522N care este echivalent tot nu am sunet am incercat printr un amplificator (IN1) si (IN2) pin6 si pin 8   si merge se aude dar cand bag integratul nu merge rog ce ar mai putea sa fie .stima

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    La pin 5 sa fie 5V-sa iasa din standby-  :nebunrau: ,iar la pin 9 sa fie 1,3V volum maxim  :91​ 

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pe pinul 9 am 1,3 1,4 v iar pe pinul 5 nu e numic

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     Intrerupeti pin 5 de restul montajului,si polarizati-l la 5 V printr-o rezistenta de 1Kohm.Si gata sonorul  :aplauze

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verificati circuitul de MUTE :

     Intrerupeti pin 5 de restul montajului,si polarizati-l la 5 V printr-o rezistenta de 1Kohm.Si gata sonorul  :aplauze

 

Corect, asa este !  ..., dar trebuie refacut circuitul respectiv.

post-226461-0-38807300-1452344658_thumb.jpg

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am rezolvat problema ,am anulat tranzistorul q702 (c1815) si a pornit sunetul si merge si  mute  va multumesc la toti

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