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csongore

TV CROWN defect

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Buna ziua!

Am un TV Crown ctv-b5051 defect nu porneste sursa a intrat in protectie(tacane).

Am gasit defect urmatoarele piese:

                      -tranzistorul final

                      -condensator 10n/630v pararel cu CE(umflat)

                      -cateva lipituri reci

 

Daca pun bec pararel cu CE am toate tensiunile din secundar deci sursa e ok, am sunat trafo linii, bobina deflexie si pare ok.

Am avut un HR7578 si am montat dar acelasi simptome cu un bec inseriat cu colector(Lini) becul palpaie cu o frecventa foarte redusa 5 secunde sta aprins 2 sec se stinge....

 

Daca aveti ceva ideii... Multumesc

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Tot in final linii par a fi inca  probleme ,dupa cum descrieti defectul!!!! Decuplati baza final linii si vedeti daca apar impulsuri.....

Vedeti si tiristorul din cadre+TEA2029.....sau eventuale scurturi pe recuperate linii....

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Am verificat partea cu recuperate + tiristorul totul e in regula. Am pus becul de 40W in serie cu rezistenta de putere de la B+ , cu becul aprins am masurat 40V in loc 200V la recuperat.

Am suntat becul parca a vrut sa porneasca si inalta dar sa dus tranzistorul s-a facut sarma inre BE. Semnalul de baza nu pot sa verific nu -am Osciloscop tensiunea la driver e OK(17V) . Poate era ceva facatura tranzistorul.

Edited by csongore

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Si fara osciloscop puteti verifica impulsurile......''ascultandu-le'' cu o casca audio.... Se aude un ''tiut''daca apar impulsurile!!!! E o verificare mai ...empirica...dar tot e ceva decat deloc!!!

Sau ,daca in baza final linii aveti o tensiune NEGATIVA inseamna ca sant si impulsuri!!!

Edited by BUGHIU

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E sasiu 10.3 probabil.traful schimbat e ok 100%?Eu acolo zic ca e problema daca sursa tine in consum.Totusi ar trebui verificata rez de 27K din snubber.

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