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nelutuPO

Ciudatenie sau nu- tv QBell

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Buna seara am un LED QBell model QXT.32KF , placa TP.MSD309.BP85, defectul  constatat , led-urile se aprind ptr  cca 15 sec dupa care se sting, sunetul este ok.  Bun am zis , am suspectat baretele cu ceva led cu supraconsum si sa intre in protectie, desfac display , verific si totul pare in regula. Tensiunea de alimentare pe barete este de 36.5 V , are 2 barete a cate 10 led-uri. Sincer nu am  barete cu 10 leduri sa pot verifica daca intra in protectie sursa din cauza lor. Ciudat este ca led-urile au acelasi flux luminos , totul ar parea OK. Un sfat , o idee ? Stima !!!

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Am dezactivat odata protectia la un Vortex cu aceiasi placa........scoate din montaj R1 si vezi daca se mai sting ledurile, daca da, atunci scoate si R2 din montaj, aceste rezistente monitorizeaza tensiunea si curentul ledurilor la pinul 7 OVP al controlerului OB3350CP, nu mai stiu exact care din cele doua rezistente le-am eliminat, incearca si tu combinatii ca nu se strica nimic......

 

Eliminare Protectie OB3350CP.jpg

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