lunes, 25 de julio de 2011

General Electric MG13400 No Enciende.

Tv.General Electric Mod. MG13400 No Enciende.
Me llegó esta Tv. y al proceder a revisarla observé que trae un chasis del usado en Samsung Chasis 15A, la conecté a la C.A. y observé que no enciende el led de stand-by por lo que procedí a checar voltajes de la fuente,Encontré el B+ de 125V ok y demás volajes que entrega esta fuente conmutada también correctos, probé el voltaje de 5V y no lo había.Probé el C.I  multiregulador TDA8139 (en algunos chasises trae también el KA7631) y observé que no estaban los 5V de salida en pin.9 por lo que probé el voltaje de entrada que en este caso se alimenta con 12.5V en pin 1 y pin2, encontré ok en pin 2 y faltó en pin 1, al rastrear los 12.5 V.encontré abierta la R809 de 10 ohms 1/2W que alimenta al CI por dicho pin.1, cambié dicha resistencia y listo.El diagrama de este TV.lo encontré como RCA mod. MR13401 y es idéntico pues usan el mismo chasis 15A.Otros modelos idénticos son CR14401,CR20401,MG19400 y MR19401.

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