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

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Collector on horizontal output is 75 volts momentarily then to 0 volts.

There are no loose connections, and the collector side of the horizontal output is 75v and then back to 0 volts. Any suggestions?

Posted by Dan Mantanona on

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Mike Longo

Mike Longo

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Never measure the collector of the horizontal output transistor. When the set is on that voltage is spiking upwards of 1000 volts and could seriously damage the meter and possibly shock you. Measure the B+ pin on the flyback instead, it should be 135 volts. Usually what I find is that the flyback itself is shorted, so when you turn the set on the B+ comes up and the horizontal output starts conducting, but the computer senses the extra current in the flyback and shuts the set back off. The red timer light on the front of the set will then blink a certain number of times to indicate exactly why the set has shut down. If you do not have experience analyzing the Sony shutdown circuit then have a qualified tech handle it for you.

Posted on Jul 31, 2007

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ALL the next is with the tv unplugged (NO NO power)
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  • remember:
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1 Answer

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If the output transistor is good you need to measure the voltage at the collector to see if it has the needed voltage to operate,is also important to check the conections in the horizontal driver transformer and also measure the volts at the collector of the horizontal driver transistor,before you check any voltages check for loose conections and overheated areas,after everything is nice and solid then you can check for volts,be careful while measuring voltages and try not to touch anything with your bare hands while the set is on.Let us know how it goes or if you need more information.

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