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

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Clicking sound, wont turn on

My Sony KP-53V75 has a clicking sound, but wont turn on. Horizontal output transitor is ok. Any suggestions you may have?

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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.

Posted on Nov 07, 2006

  • Omar Urrutia
    Omar Urrutia Nov 07, 2006

    Your rating response is also important.

  • Omar Urrutia
    Omar Urrutia Nov 07, 2006

    The collector voltage at the driver transistor should be around 60 volts dc and at the collector of the output it should be about 130 that is if the horizontal drive signal is present.If you can measure the collector of the output at any other place it will be better.

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1 Answer

Sony KP53S75


Hello
there is some shorted component/s in the horizontal output section of your project TV. check them. Horizontal output transistor and transormer should be checked.

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1 Answer

Power ok but not eht function


Hello

If you have tested the secondary section of the SMPS power supply of your Sony TV, amd found it OK I thinks, and posts this solution.

If the secondary supply rail 125VDC is found ok, just goto to the Horizontal Output Transformer, a small transformer diretly soldered on tho the main board, very near to the Line Output Transformer [LOT], and its secondary winding is connected to the base of the line output transistor, which in turn drives the LOT said above, generates EHT you described.
The base of the line output transitor must get appropriate frequency to switch on and off. This frequenct is gerally comes to 15625Hz. Just measure the voltage across the primary winding of the above said line driver transformer, which can be a possiblity open winding. Check the voltage at the collector point of the line drive transitor connected ti the one end of the primary winding is easy. Then check the voltage at the other end of that winding. There must be a little difference of 2VDC or so, if the line drive section is working, and fault is after that section, that is line output section. If you have a digital multimeter capable of measuring frequency, measure the frequency of the collector point of line drive transtor, and find out whether there is 15625Hz or near to this frequency comming out. Never touch the multimeter prob to the collector of Horizontal Outout Transistor, while it is working. Your meter will get damaged.
Line output section, contains tha LOT said above and line output transitor. If the Line Output Transistor has some sort of leak, normally collector to base leak, it will not drive the LOT to produce EHT and it wlii heat up also.
Just check it heat effect, after switching the set on for a short period of time, say 30 seconds ro so. If it heats up abnormally, suspect the line output transistor and LOT. You just replace the line output transistor first, with same type and number. If it doesn't retify your problem, LOT said abve is faulty, and it also should be replaced with same type and number.
If you have to replace the horizontal output transistor, and the LOT said abve, insist on orginal, and not replace it with a susbstityution, as these are critical components in all TVs..
If you need further assistance, get me through Fixya, and be free to conact me. Ok

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Hello
There is some sort of indirect short inside your TV. It is in the main circuit board. Most of this kind of fault in Sony Tvs are related with horizontal output stage. You just replace the horizontal output transitor [which drives the Line Output Transformer] of your TV first. If the transitor is leaky, the above said falult may occur. If it doesn't help Line Output Trnasformer [LOT] may need replacement. Check whether the replaced transistor overheats within seconds or minutes. If it overheats the LOT is faulty. Ok.

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1 Answer

I have a kp-51ws500, that comes on the colors get wierd then it shuts off, any ideas? Lamp?


Not Lamp, it is problem of convergence output ICs failure. KP-51WS500 is rear projection tv that has 3 color tubes to make picture, this tv does not have Lamp as light source in DLP tv.
Replace convergence output ICs to fix the issue. Local tv repair shop will help you if you have no experience in electronics stuff fix.
Thanks.

Jul 27, 2010 | Sony KP-53V75 53" Rear Projection...

1 Answer

My sony rear projection model # KP51W5510 it just makes a clicking noise and the power/stand by light keeps flashing no picture and occasionally a sound. what could be the problem


Sorry it took so long to get back to you. It's been busy. You have a problem with the high voltage section. I have a tip at http://www.fixya.com/support/r4916941-diagnose_repair_projection_tv_high which explains the problem, how to repair it and where to get the parts.

Thanks for using FixYa and for the great rating.

hardrocko

Apr 27, 2010 | Sony KP-53V75 53" Rear Projection...

1 Answer

Sony KP-57WS500 57 in. Rear Projection tv When I press the power button there is no picture but the "timer / Standby" light flashes. Sometimes when pressing the power buttonthe light flashes and I hear...


CK your hori output Transitor and behind it is a blue high voltage capacitor 2k sometimes they will have small burt hole on them ,If it is OK then Replace your STK ICs example STK392-110 Mats has them 1-800-628-1118

Feb 15, 2010 | Sony KP-57WS500 57" Rear Projection...

1 Answer

I have a Sony KP-53V75 projection tv and there is not color on the screen. All three color guns are functioning and the convergence works. Why am I not getting a color picture on the screen?


sounds like you are having problems with the luminance and chroma circuits.go into menu and check the settings. If they are ok, then you maybe making a trip a repair center

Sep 08, 2009 | Sony KP-53V75 53" Rear Projection...

1 Answer

Speaker Off/On


If I am reading your symptoms correctly, it sounds like you are getting audio to your surround sound receiver, but not your TV speakers? If that is the case, I would be checking for a defective audio output IC and possibly an IC Protector fuse connected to it.

Dec 29, 2006 | Sony KP-53V75 53" Rear Projection...

1 Answer

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


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.

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

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