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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Re: collector on horizontal output is 75 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.

Posted on Jul 31, 2007

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We had apower surge while watching tv. now there is no picture, but we can hear the program.

This could be the tuner damaged or a regulator damaged depending where the surge entered the set. Lighting will damage tuners while line power surges will damage regulaters and often horizontal output transistors along with sweep mode power supplies. Since you have audio I would suspect the horizontal output transistor first and check it from collector to base and emmiter for short with a digital volt ohm diode check meter. Check with diode check mode.

Oct 14, 2009 | Akai PT5598HD 55" Rear Projection...

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ALL the next is with the tv unplugged (NO NO power)
  • resold the jungle (video processor) all around
  • 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.

Apr 15, 2009 | Projection Televisions

1 Answer

Rear projection mitsubishi vs5042 no high voltage

Are you talking about the LV power supply or the HV power supply? The terminology your using is related to the horiz drive circuit. Have you checked the B+ off the regulator which should be about 120v or, it will on the pc bd for the correct voltage. Do you have sound? If you do then you will have to use use your scope to see if you have proper drive at the base of the Horizontal Output Transistor. Then we can go from there. Oh, by the way I can tell by the voltage readings you stated both of those transistors of turned off.

Feb 21, 2009 | Mitsubishi Projection Televisions

1 Answer

Flyback transformer and horizontal output transistor change out

There is a little loose sleeve at the transformer. It can be pulled out, but it is best to squeeze the sides through hole on each side of the terminal to remove the sleeve. The wire just comes out with a small pull afetr the sleeve is removed. Good luck.

Dec 20, 2008 | RCA Projection Televisions

1 Answer

Dead set

These sets had a serious crt problem.Check and see if there is any arching on the tubes or tube sockets.

Mar 07, 2008 | Samsung HC-P4752W 47" Rear Projection...

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Horz. Output Transformer for a GE Mod#46GW945

Check this guys: //
This guys may carry that part: //

Jan 24, 2008 | GE 46GW945 46" Rear Projection Television

2 Answers

Akai PT4298HD No Power, Blinking timmer light

if you know aything about tvs which it appears you do check to see if you are getting voltage to the horizontal output ckt at the collector of the horizontal output transistor if you are probably you either have a horizontal drive or output problem if you are not check to see if you have either fuses or icps or pico fuses are open generally you will see about a 135 volts to yhe hoizontal output ckt.

Dec 15, 2007 | Akai PT4298HD Rear Projection Television

1 Answer


Unsolder collector and if the unit stays replace p/n#239111 FBT - and those resistors. Also check the solder on L14401, it's the coil off the base of the HOT (Horizontal Output Transistor). You might want to re-solder it anyway just for good measure.

May 29, 2007 | RCA P46924 46" Rear Projection Television

1 Answer

Clicking sound, wont turn on

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...

1 Answer

Will not come on

IS good you have some indication of power,that means some of the volts supplies are working,if you are familiar with tv service you can check for loose conections in the horizontal drive and output circuits,this circuits energize the output transformer and he provides more volts supplies,if the output transistor is bad(shorted) is likely it damage the fusible resistor too.You might have to do some measurements and soldering.If you are not too familiar with tv service be safe and call for assistance from a servicer.

Oct 11, 2006 | Hitachi 46F500 46" Rear Projection...

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