Question about Sony KP-53V75 53" Rear Projection Television

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Sony KP-53V75 53 in. Rear Projection Television

Lightning struck very close to my home and knocked out 3 out of 7 televisions one being the most important [since football season is aproaching fast]my 53 inch sony. When power is turned on t.v. dosent come on but timer/standby LED will light up. Called repair shop and technition said it was bad power supply.[this being after I checked fuse by power cord]technition quoted price of 600.00 dollars for repair. I myself am a service technition in the low voltage industry but im not real sure on how to approach this problem and was hoping you might could help me it the whole board or can i extract a part from the board and replace with a new? storm was really bad [texas] and I've takin on multible repairs insurance is helping but not with everything. 600.00 sounds really steep but i've already paid tech to come out and make assessment[3 televitions,2 DVD players and 2 cordless phones] and cant really afford another service call by other company.I thank you. for any help you can give me. also is there any way I can get a service book on this sony product you know of? Thanks again for youre help robert campbell

Posted by robert campbell on


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Mike Longo

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I am not sure exactly which power supply that model uses but here is what I usually do: Remove the power supply board and be sure to discharge all of the power supply capacitors. Look near the large cap(s) and AC rectifier for a small white resistor whose value of 0.1 ohms is printed on it. That is your power supply fuse. Measure the resistor and if it is open then you can bet that the switching transistors are shorted. On older sets there are 2 separate transistors (2SD4834) and the newer sets have the 2 transistors combined into one 6-pin package labeled MX0841 or MX0842. If you find that part shorted then replace it and the Sony 0.1 ohm "fuse" (use exact Sony replacement parts) and your set should be fine. If you find that the 0.1 ohm resistor is good then there is a much more serious problem and the set should be serviced by a qualified tech experienced in Sony sets.

Posted on Jul 10, 2007


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