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Thomas 54tcb063


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Defectul la acest tv consta in faptul ca la o imagine mai alba apare pe ecran o dunga neagra, intunecata de fapt, orizontala, lata cam de 7-8 cm

Am verificat BV dar nu cerd ca este de acolo, pare defect de imagine, am schimbat si tubul si face la fel.....rog ajutor...eventual pot pune o poza.

mentionez ca dunga apare ori in mijloc, ori sus sau jos, cateodata apare inca o dublura....

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Tubul avea uzura, mergea cu focus la maxim si ug2 destul de mare...dar tot asa facea....M-am gandit ca este si de la linii...banuiesc ca va referiti la cei de recuperare si intoarcere linii..am gasit R431 arsa, insa nu-i stiu valoarea...am pus de 1kohm? 

Edited by catalin004
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Incep sa banuiesc trafo linii....dunga neagra apare cand schimba lumina de la intunecat spre luminos....tensiune TK 180V, ug2 =400V....si nu variaza....

 

eu cred ca nare legatura trafu linii ai schimbat cond pe tensiunea de 180v finali video chiar daca are tensiunea el poate fi devalorizat si eventual pune o poza cu dunga sa vedem despre ce este vorba

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hmmmm....nu prea o mai face...care sa fie cauza?

la marirea ug2 cursa inversa apare de jos in sus nu toata instant ....dar tot face numai ca este mai gri si mai transparenta

 

daca dau contrastul aproape de minim nu mai face dunga deloc 

Edited by catalin004
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