Question about Sony KV-27S42 27" TV

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I turn the power on, but it keeps shutting off. The standby light is pulsing two times if that helps any. Thanks

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  • Sony Master
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Hello
Two blinks of standby light in Sony sets denotes that there is some short circuit inside the circuit board. It could be with a shorted capacitor, shorted horizontal output transistor or defective Line Output Trnasformer otherwise known as [LOT]. To determine it you have to open the TV. You must have a concept of soldering and more confidence. LOT described above can be located on the mainboard itself. One wire from it goes to the top side of the picture tube's final anode, and seem to be sticked to it with a rubber ******. That is [LOT]. Very near to that LOT you can locate the horozontal output transistor stated above, screwed onto a metal heatsink. You just resolder it out from the board, and check it for collector to emitter leak. It is best to replace it with a new one of same type and number. Insist on same type and number, since it is a critical component. After replacing it, just switch on the TV for a few seconds, say four or five, and switch it off, unplug it from wall socket and feel the heat of that trasistor with bare fingers. If it overheats, it is a sure symptom of LOT fault. You have to replace the LOT also with same type and number. Before replacing the above said components, you just resolder the transistor said above, and just switch on the set without it. If the sytandby LED lights for the same number of time, there may be any shorted capacitor in the main secondary supply rail; usually 130VDC, LOT power supply. There is a EHT boosting capacitor fitted very near to the transistor said above, at about 470Pf; ceramic or so. There is a chance that this capacitor may get shorted. Anyway, your TVs secondary power supply rail has a short. Two blinks of standby light denotes Over Current Protection [OCP]. It is a self diaganosis process going inside the the TV, and every Sony set has the same fuction. Ok
Take every precaution before you open the TV. Mind that you are going to work with an electrical equipment, which has as high as 26,000VDC points are inside it. Keep chlidren away from you while you are working. Not even allow them to come nearby you, and let an adult beside you as a precautionary measure. Ok

Posted on Nov 12, 2010

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  • Sony Master
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2 blinks of the standby LED - denotes B+ over current protection (OCP) mode. Usually due to a short-circuit on one of the main voltage rails between the power supply and horizontal output stages.

Check the horizontal output transistor(s), the flyback transformer for shorts, and check all the tuning capacitors in the collector circuit of each transistor as applicable. The working voltages of these caps should be uprated whenever they're replaced.

Posted on Feb 22, 2011

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