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?

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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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Posted on Jan 02, 2017

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I assume you might have post this problem under CRT based TV; and not with Flat Panel TVs. Anyway let me post a solution to this. The first thing you have to do is, to solder all the four connections to deflection yoke. It's a must. Never allow any loose contact with these connections. It might lead more troubles. Never switch ON the set, without soldering these connections well.
Then comes, the case of raster. If there is only a blue raster, with horizontal lines, as you describe here, it should be the fault with its video output stage circuit itself, provided CRT is good. If the horizontal lines displays at equal space, that is, at about an inch space, all around the screen [white thin lines], and are some what parallel to each other, check the voltage at the blue cathode of the CRT base. If this voltage is very less than the other two cathodes, check the blue video output transistor's collector voltage. Check the transistor for collector-emitter leak. Replace it. Check its collector voltage. If found very low, check and replace the load resistor connected to it collector to video output supply voltage [180VDC].
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Check the LOT. If it is faulty, horizontal output transistor will blow out. Check the capacitor connected across the collector of the horizontal output transistor to Gnd. If it is bad, or have any loose solder terminals, H-Out transistor will blow out. If you wish to get more http://electronicshelponline.blogspot.com/ check this link. Pull up older posts there, either by its left side bar, or see it in Timslide option.

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If you have more than 1v drive on the base and 145volts on the collector, I would suspect the LOPTX.

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ALL the next is with the tv unplugged (NO NO power)
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  • following the horizontal drive pulse path and arriving to the horizontal area just after the horizontal transformer and in the base of the horizontal DRIVER there is a electrolytic capacitor (if this chassis uses this one,) Change it (maybe is dry)
  • solder all components i just told you in the last step. horizontal driver, transformer, etc
  • remember:
  • if a transistor is blowing with no reason (there is a reason: the collector receives 130 volts but cannot hold it forever, It has to be in some place. if the switching pulse doesn't arrive to it the transistor throws this 130 volts and burning itself. i hope it is help full.

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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.

Nov 07, 2006 | Sony KP-53V75 53" Rear Projection...

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