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Model Pan TH50PX75U Purchased May 18, 2007 at Circuit City,Sore 443. Problem: I do hear "high voltage spark sound" from the unit. A few weeks ago, the spark sound was somewhat weak, but since yester day, the sound is quite loud, as if high voltage wires are too close together,thus jumping incessantly across the wire(s).

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By any chance do you have the circuit city extended warranty?
If not you gotta act quick on this its less than a year old... DEMAND a replacement TV of the exact kind or equal to the value you originally purchased from Circuit City... Now listen your going to have to call Circuit City Corporate 1-800-843-2489 its going to take time on the phone... but if your persistent they will give you a new TV "Been there done that" I also return stuff without receipts and only because I make a stink about it do they do it... be mad... Tell them you'll never purchase from them again if they can't make this right for you... Thats an expensive TV do you think they want you telling people "DON'T BUY from them. Try this once you get a real person on the phone lol a representative say "Hello I'm offering circuit city the opportunity to keep me as a valued customer... and tell them how its going to be or Best buy will get the sales on TV/Electronics from now on.

Companies will bend over backwards to keep a customer... its easier to make an old customer happy on a single occasion than to make a new customer happy on his 1st purchase ever.

Last thing I got in the mail was a manuf coupon for "Free Battery of any type"
because my battery went capute after like 1 1/2 years in my truck.. so I told the company if they ever wanna sell me another battery they need to make up for this one.
My original battery was only $59.99 but I got the best one it was $149.99. They were smart to do that because now I'll stick with them and recommend them.

Don't feel like doing any of this just take it to a repair place and attempt to collect on the limted 1 year warranty from Panasonic.

Posted on May 05, 2008

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Hi

Your Unit is in high voltage short circuit Spark Gap! i can fix this trouble! sir do you have experience in electronic repairing? or are you a technician!?

Thanks!!!

Posted on May 05, 2008

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Rca scenium projection tv turns on lights blinks 5 times no sound or picture and make a siren noise


this is likely due to a leaky high voltage circuit an open or leaky device will allow the 30 or more thousand volts to spark to ground or another component, if you have the back off turn the lights off for total darkness have a partner turn the tv on wile you observe in the back, if there is a spark you will see a deep blue flame or ark and a squealing sound will be heard.. If so i suggest you read on....






Hello, i will list the criteria required to service TV and projector TV`s first and foremost you require a good understanding of how TV`s work and the ability of reading schematic diagrams, then you require a knowledge of how printed circuit boards are patterned so you can navigate around them to locate possible trouble spots.
then you require
1 multie meter of good quality
1 oscilloscope 20 MHz or better
1 shop service manual pertinent to your type and model of unit you wish to repair
this is a minimum requirement of test equipment you can have

you also kneed a location or locations to obtain the replacement parts you may require to complete the service task.
Now if you have all the above criteria in place then you have some hope to service your unit

a flashing red indicator on your TV usually refers to an internal circuit failure, most modern TV`s have circuits incorporated in the circuit design to protect good working components not involved in the fault from further damage so the set will not power up and an indicator light will start flashing, trouble spots can be anything like power supply under voltage, over voltage over current, no vertical deflection, excessive high voltage, XRAY, convergence failure,, EXT EXT,EXT,
Warning rear projection televisions can harbor in excess of 30,000 ,yes that is thousand Volts

There are and never will be user serviceable components inside LOL

Now if you are ready and require further assistance you may contact me and i will step you through the diagnostic procedures Good luck

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Sharp tv not coming on


Check the power connections first.

Sep 09, 2008 | Projection Televisions

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I have a Hitachi Ultra Vison 57S700 2004 model, the TV has had a slight high piched whine for a couple of weeks and today the screen went green then black and the sound was gone. When it is turned on the...


This tv is under five years old?Yes,it is worth fixing.Over five,i would compare the prices for a new LCD tv and the quote priced from the Tv Tech.for the old tv.This tv have high voltage problems around the Deflection circuitries area.Could be any things burn in this area.The high pitched whine sound,i'm sure it is from the FBT-the high voltages flyback transformer,high voltages current have no where to go.Must hire a tv tech. to troubleshoots and replace parts on the Deflection circuitries area.Also the FBT could be dead too,because HV Current bounces back forth and have no where else to go.The prices to troubleshoot unknown problems is about $400 bucks and plus cost of replacement of parts.

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MITSU 65" MODEL # 65613 I HAVE PICTURE BUT NO SOUND , ALREADY TRIED THE RESET BUTTON . ANY HELP WOULD BE APPRECIATED


I have a similar model, and I had it completely apart a few months ago. There is a power supply that provides power to the motherboard, the light engine, and the sound system, and the lamp (all seperate power taps). It sounds like perhaps someting in the power supply connection to the sound portion of the system is malfunctioning, or that the sound boards themselves have failed.

My unit's problem was the power supplied to the high voltage lamp, a trace on the circuit board was broken, and it was unable to source enough current to reliably start the lamp.

Be careful around the power supply, the capacitors store a significant charge, and they can very easily shock you. I would not recommend disassembly of the unit or an attempt to repair unless you have experience with high voltage electronics. Any dissassembly will void your warranty as well.

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Tv trys to start. you'll hear audio for two secounds, no picture, then 8 flashing lights, repeats after a few secounds 8 more flashes etc,etc


There is a problem in the audio circuit or the high voltage circuits. Check IC406 audio amp, PS401, and 402. Check also the flyback transformer T8005 or the associative components around it or associated with the high voltage circuits on the D board. Try also unplugging the unit for an hour to allow the unit to reset and make the unit work. It sometimes resolves start-up issues with the unit.

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1 Answer

You turn on the tv then it turns off right away with no picture displayed could probably used new screen too


The repair of this unit will be determined by the status of the high voltage on initial power up. You need to do a few tests in order to narrow down what the high voltage is doing. You will need someone to assist you.

Unplug the AC cord. Remove the rear lower cover from the tv. Make sure the room is quiet. Put your ear inside the tv being careful not to touch anything metal, although most metal objects are ground. Next, have someone insert the cord into the AC outlet while listening very carefully. What you are supposed to hear is a click which is a relay and high voltage snap up. If you do not hear a swishing sound, which is the sound of high voltage have someone press the power button on the front while you are still listening. If you hear the swishing high voltage sound come on, it will come on and stay on, or collapse. Repeat the test, unplug the cord and plug in the cord to confirm the high voltage is coming on and staying on or coming on and going into collapse.

If the high voltage does not come up at all it means that there is a basic high voltage power supply problem and an experienced technician needs to guide you through a high level repair which is above the scope of this discussion. You may want to contact a skilled technician.

If the high voltage comes up and collapses right away, which is the most common fault, it means that the unit is entering the protection mode. The protection mode is most commonly caused by convergence or vertical sweep system on that model and big screens in general. These repairs can possibly be done by consumers with basic electronics knowledge. If you want to repond with test results we can supply more information on repairing the convergence or the vertical sweep system.

If the high voltage stays up then the likely fault is a power supply problem is muting both the video and the audio causing the unit to go into protect. Consult a service manual, track power flow though out the unit to determine which circuit is impaired.

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1 Answer

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do u hear any high voltage static when you first turn on. possible high voltage problem with the high voltage splitter or focus pack. ussally when there a problem with these high voltage is being generated but not delevered to the tubes

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This is a classic symptom of high voltage shutdown. There is probably a bad flyback [high voltage transformer]. The problem is one for the techs. Replacement usually involves also replacing several H/V components as well. The TV tries to come on, energizing the H/V circuits, then, the protection circuit detects too much current and goes into "protective shutdown" and then tries again. After a few tries, it stops trying. The protective circuit us there to keep from blowing breaker or causing a fire.

If it's an expensive set, take it in to the shop, otherwise go shopping for a new one. This repair can run anywhere from $100 - 400.

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It would be well to replace your flyback transformer before it gets worse and blows up something else as well. Best done by a professional used to handling high voltage. The picture tube can retain voltage even when the TV is unplugged for some time, and replacing the anode lead (the big red one) can be dangerous.
Hope Ya Fix It!

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