Sony BRAVIA KDL-55EX500, no power, APS-256(CH) power supply repair

Sony BRAVIA KDL-55EX500

Failure symptom: No power

Upon diagnosis of the power supply I found that  power MOSFETs Q6304 and Q6305 were shorted between source and drain and fusible resistor R6350 was open. Power MOSFETs Q6304 and Q6305 were 2SK4096 , 8 amp, 500 volt, N channel MOSFETs and were replaced with substitutes, FQPF9N50CF 9 amp, 500 volt MOSFETs. Resistor R6350 was a 1/2 watt 0.47 ohm fusible resistor.

After replacing the faulty components and installing the power supply the TV turned on and was completely functional.

 KDL-55EX500, APS-256(CH) Professional Repair:

If you are interested in having an APS-256(CH) or any other power supply repaired professionally contact johnpreher@gmail.com

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