damian_sandel68 Posted February 14, 2015 Share Posted February 14, 2015 are pe sasiu; procesor saa 5531ps/m4/0329, junga stv 2246, cadre tda 1771, sursa cu tda 4605. Toate tensiunile sunt ok, comuta din stby in on dar nu pornesc liniile Tranzistorul din driver este blocat ( cu +07v in baza) Am verificat tot ce este posibil si nu porneste. O idee, va rog. Multumesc. Link to comment
IONPREDUT Posted February 14, 2015 Share Posted February 14, 2015 (edited) vezi ca este un cond ceramic pe acolo prin bh,care da acest defect! s-au mai bine verifica bv prima data,pentru ca daca acesta este def. nu pleaca liniile! Edited February 14, 2015 by IONPREDUT Link to comment
damian_sandel68 Posted February 14, 2015 Author Share Posted February 14, 2015 Circuitul integrat din bv l am schimbat din prima, am schimbat si jungla si toti condensatorii din bo. Am incercat mai multe dump-uri ( dar nu am gasit nici unul pentru adevaratul saa5531!Poate aveti unul verificat! Link to comment
dan-a2 Posted February 14, 2015 Share Posted February 14, 2015 Incearca dumpul asta >> CTS-AA_SAA5531PS_M4_0329.rar Link to comment
damian_sandel68 Posted February 14, 2015 Author Share Posted February 14, 2015 Multumesc dl Dan, dumpul este ok, executa bine comanda on-of, dar dfectul persista Link to comment
dan-a2 Posted February 14, 2015 Share Posted February 14, 2015 http://www.elforum.info/topic/21639-defect-pacific-s-cts-aa/ Link to comment
dan cod Posted February 14, 2015 Share Posted February 14, 2015 Daca dai finalul linii jos ai impulsuri in baza driver? Link to comment
damian_sandel68 Posted February 14, 2015 Author Share Posted February 14, 2015 Nu pornesc liniile nici macar o secunda.Chiar cu tz-ul scos tensiunea driver-ului este pusa la masa din cauza saturatiei tranzitorului (+075v in baza). Mentionez; comanda pleaca din stby in on si asa ramane pana la o noua comanda voita in stby. Link to comment
IONPREDUT Posted February 14, 2015 Share Posted February 14, 2015 ce ci. i-ai pus in bv? Link to comment
dan cod Posted February 14, 2015 Share Posted February 14, 2015 Si fara tranzistor driver nu ai semnal in baza?nici un impuls macar? Link to comment
damian_sandel68 Posted February 15, 2015 Author Share Posted February 15, 2015 Buna dimineata, Mii de scuze ca nu am raspuns pana acuma. Circuitul din bv este, asa cum am aratat la inceput, tda 1771. Cu baza tranzistorului driver in aer nu este nici-un impuls decat tensiunea de 8v. Impulsurile linii sunt blocate in jungla. Motive sunt multe dar nu le gasesc! Link to comment
damian_sandel68 Posted February 15, 2015 Author Share Posted February 15, 2015 Domnilor, am recurs la fortarea junglei pri lasarea pinului46 in aer, pinul 49 la masa si tot nu exista impulsuri in pinul48. Am decupluat sda si scl, exista impulsuri dar nu pornesc liniile. In pinul 49 -lbf-sunt 2,5v in loc de aprox. o,8ov. Condensatorul de recuperare din bo a fost schimbat, defectul persista. Ma gandesc la procesor, ce idee aveti, ca daca l-as avea il schimbam mai la inceput. Link to comment
Florinel TV Posted February 15, 2015 Share Posted February 15, 2015 nare treaba procesoru cu pornirea acolo mei este ceva defect urmareste pin49 la stv si acolo gasesti ceva defect de nu pleaca liniile succes Link to comment
damian_sandel68 Posted February 15, 2015 Author Share Posted February 15, 2015 Problema rezolvata. Defect tz din pin 36 procesor. Multumesc tuturor pentru ajutor. Link to comment
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