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Sears tv 774 15580

Sears tv model 774-15580 high voltage sparks from ceter post to square bracket

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I have same problem, arcing from horizontal output transformer (fly back trans), sears has no model number in their system, Flyback Transformer needs to be replaced but no luck finding one yet, anyone have suggestions on where to find one, part number BSC29-N1111

Posted on Aug 18, 2008

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Posted on Jan 02, 2017

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Sony KP-57WV700


Hi. It seems that the g2 voltage of the picture tube is too high, resulting in a white screen, often with white horizontal lines. The g2 (= second grid) voltage is derived from the flyback high voltage. The voltage divider is mostly integrated in the flyback trafo housing.(including the adjustment knobs). A failure in this divider may lead to this defect. The static you hear may come from sparking in the divider. The flyback trafo is soldered onto the main printed cirrcuit board. Sometimes, one of the pins sits loose in the soldering pads.
Turn on the set and observe for any sparking around the entire flyback circuitry, and, or the flyback trafo itself
The screen turns black after a while, as a too high beamcurrent is detected. The set disables the flyback. Stand-by blinks meaning that there is a fault condition.
Be carefull with the high voltages. The flyback voltage is very high (20-30 Kilovolts !) and may be lethal !!

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1 Answer

Spark


The black unit is the high voltage transformer and splitter and it has possibly cracked causing high voltage to leak out. Unless you have a heavy duty soldering iron and good with multiple solder connections, it may be best to have a technician check it out for you. I would guess it would cost in the $200-$300 range. Thanks for using fixya.

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The tv was working and made a hiss and pop and quit, I replaced the flyback and now it just ticks


When you replace a flyback on an RCA Model, Always replace the Horizontal Output tranistor with it. These models are notorious for for bad solder connections in and around the HV area. Also check around the High Voltage Area for bad HV Scaning Capacitors. These are usually square shaped , for cracking,arching,and swelling. Replace if found to be defective. One more thing check the neck of the picture tubes for cracks or arching inside a tube when trying to turn the set on. Sometimes a bad scanning cap will go defective and drive the high voltage so high it cracks the Green CRT.

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Where can I find a High voltage tripler for this Toshiba TP55H95


Sears Parts Direct claims to have one part number is 24082877

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It sounds like you have a shorted picture tube.
You should call a good TV Tech to confirm this and get an estimate.

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The Lamp (CRT) got shorted / leaky that gets spark / arcing and requires replacement. TV is an old model and I'm not sure that CRT is available any more.

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1 Answer

Loud static type snap from tv


TV's use high voltage to generate the stream of electrons traveling across the picture tube hitting the screen and lighting it up (thus the name Cathode Ray Tube). It takes about 25,000 volts to do this. In normal air, it takes about 1000 volts to jump an inch of air, so the high voltage transformer needs to have good insulation. It generates the voltage through a technique of charging the transformer's magnetic field with a low voltage of about 140 volts then letting it go where upon it flys back out the high voltage side at much high levels (Thus the common name flyback). A most common failure in a CRT type TV is for the insulation to crack in this transformer which is a unique component for each model of TV and leak out the current overstressing the circuit driving it. You can liken it to a little bolt of lightning getting loose in the circuit and has the same sound on a smaller scale.
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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You have a bad high voltage transformer. It is the white square device about 3inch square with large red wire coming out. Must be replaced with RCA original NO GENERIC. Also the horizontal output transistor must be checked to see if it is good. Recommend honest qualified tv repairman

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Sparks arcing from rear of tv


Wow they are charging you alot for this repair my friend. Go to this link and you will see! The High Voltage transformer, also known as a flyback only cost 50.00 Bucks!http://www.partstore.com/ProductDetail.aspx?ProductSKU=2187762&ProductType=PART&ModelID=420798 I would get the part and let someone replace it If you have no soldering and or TV repair experience, as this is a dangerous place to be experimenting with if you do not know the safety issues involved. Good Luck Please dont forget to rate this thread.

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Thats the flyback(high voltage transformer) Or the Focus/High Voltage distribution block. In ant case your shouldnt touch eather as there is enough Hi voltage there to kill you. Please seek out a pro to assist you in this repir. A tv set is not a place to experiment with. Good Luck

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