Guest gabby80 Posted December 15, 2012 Share Posted December 15, 2012 buna seara.am in lucru un tv provision 1427t,sasiutv2kr-txt.cu sursa de in scurtcircuit.Am gasit fet-ul ars ,puntea redresoare arsa,o rezistenta de 150k ce alimenteaza uc3842b era si ea arsa ,dupa ce am inlocuit toate aceste piese mi-a ars dinou fet-ul ,credeti ca este busit si uc3842b?in rest am masurat toate piesele din sursa si sunt ok.multumesc anticipat. :cry: Quote Link to comment Share on other sites More sharing options...
raileanu florin Posted December 15, 2012 Share Posted December 15, 2012 pai si normal daca ai schimbat toata sursa acel ci de ce nu lati inlocuit Quote Link to comment Share on other sites More sharing options...
popa ionut Posted December 15, 2012 Share Posted December 15, 2012 normal ca atunci cand se repara o sursa se incerca si ea cu becul,iar in cazul tau sigur este dus si UC3842 daca s-a ars rezistenta de 150k Quote Link to comment Share on other sites More sharing options...
Guest gabby80 Posted December 23, 2012 Share Posted December 23, 2012 e si normal sa incerci sursa cu becul si am si facuto dar nik,si nu am schimbat acel integrat pt k nu am avut unul la indemina si cel mai apropiat magazin e la vreo 35km,....... Quote Link to comment Share on other sites More sharing options...
dan cod Posted December 23, 2012 Share Posted December 23, 2012 Schimba neaparat CIul.In 90% din cazuri cand se duce fetul se duce si ciul. Quote Link to comment Share on other sites More sharing options...
Guest gabby80 Posted December 30, 2012 Share Posted December 30, 2012 am schimbat si ci ,tv a intrat in stby apoi intro fractiune de secunda a tronsit 2 diode din puntea principala vd301 si vd 303(1n4007) si siguranta (ceva normal),dar si un termistor mf72(r301),se pare ca fet-ul a scapat ,pot fi diodele de proasta calitate sau de ce le trosneste,am cautat un scurt circ si nu am gasit si nici vreo piesa in scurt... Quote Link to comment Share on other sites More sharing options...
mariantoader82 Posted December 30, 2012 Share Posted December 30, 2012 Pune alte diode ,chiar din recuperate (1n4007) si pentru a nu mai arde alte piese pune bec in locul sigurantei ,totusi cred ca sa ars si mos fet-ul. Quote Link to comment Share on other sites More sharing options...
validae Posted December 30, 2012 Share Posted December 30, 2012 Nu mai face probe decat cu bec inseriat (in locul sigurantei) dupa ce-l lasi un timp si masori tensiunile B+ si celelalte, atunci alimentezi normal.Vezi ca unele surse nu prea vor merge decat cu bec de 100Weu probez cu unul de 150W. Vezi sa nu ai finalul audio in scurt, sau alte module si de aia bubuie sursa.Vezi condensatorii din sursa si orizontal in ce stare sunt, schimba-i eventual ca nu-s multi. Quote Link to comment Share on other sites More sharing options...
Guest gabby80 Posted January 7, 2013 Share Posted January 7, 2013 am inseriat becul de 100w sursa intra in stby tensiunile sunt foarte ok b+ este 112v,celelalte 30v,14v,3.3v,singura tensiune care nu o am este 8v care imi iese de pe regulatorul de tensiune lm317t si din cite stiu are ca echivalent ka317 am sa incerc inlocuirea lui Quote Link to comment Share on other sites More sharing options...
dan cod Posted January 7, 2013 Share Posted January 7, 2013 LMul e comandat de procesor sa scoata 8V.Vezi daca are comanda. Quote Link to comment Share on other sites More sharing options...
Guest gabby80 Posted January 7, 2013 Share Posted January 7, 2013 de la pinul1 al tda9351 unde am 1,5v Quote Link to comment Share on other sites More sharing options...
dan cod Posted January 7, 2013 Share Posted January 7, 2013 Acolo se modifica tensiunea cand e pe on sau pe off?Pe intrare in Ci cat ai? Quote Link to comment Share on other sites More sharing options...
Guest gabby80 Posted January 7, 2013 Share Posted January 7, 2013 pe ci lm317t am asa pin1 0,08v;pin2 1,31v;pin3(in)11,5v;iar pe proc la pinu 1 ramine constant 1,6v, nu ia nici o comanda ramine blocat in stby Quote Link to comment Share on other sites More sharing options...
dan cod Posted January 7, 2013 Share Posted January 7, 2013 Asa am banuit comanda lui defecta.Acolo trebuie sa gasesti cauza. Quote Link to comment Share on other sites More sharing options...
popa ionut Posted January 8, 2013 Share Posted January 8, 2013 Ai incercat pornirea din telecomanda?! Quote Link to comment Share on other sites More sharing options...
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