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legionaru

ZANDER TC-21JP8

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Sasiu ph02-lsq060113 echipat cu tda9361, cadre la78040, sursa cu tranzistoare

A venit cu defectul: nu porneste

Am gasit condul de 470uf/16v de pe bara de 8v in scurtcircuit; l-am inlocuit si a pornit

L-am lasat sa functioneze si dupa vreo 2-3 ore s-a oprit brusc, ramanand aprins led-ul de st-by

L-am pornit din nou, am marit putin ug2 si a aparut linie ingusta pe orizontala

Facand masuratori am constatat ca stab-ul de 8v nu se alimenteaza, pe emiterul v570(b892) exista 11v

Daca scot v570 si fac punte intre e-c alimentand intrarea stab-ului 7808 televizorul functioneaza normal

Am verificat lantul: pin1 proc-r729-v572-vd562-r578-r579-v570 totul ok

Ceva imi scapa, dar m-am blocat... ma puteti ajuta?

 

 

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Poate e defect tranzistorul chiar daca da bine pe multimetru.Sau comandat gresit in baza.Nu am schema in fata sa pot spune mai mult.

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am schimbat vd 562 si c1815 chiar daca dadeau bine pe aparat, fara nici o modificare; o sa caut un b892 sa-l inlocuiesc si le acela...

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pe pinu 1 proc ce tensiuneeste ON si OF pe acest pin da startul

are start pe pin 1 proc :96

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Am scos b892 de pe placa, am cautat ceva echivalent prin ce aveam eu, am gasit b764, l-am montat si a pornit normal

Fiind totusi inferior lui b892 ca, caracteristici, am montat un bd434 si functioneaza bine.

Ramane in proba sa vad cum se comporta

Multumiri pentru implicare!

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