Question about RCA F36650 36" TV

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Replaced Flyback Transformer and Horizontal Output Transistor

Had the same problem everyone else describes with this model. Replaced Flyback Transformer and Horizontal Output Transistor. Now the TV powers on and the sound works fine but the picture is so dark it can barely be seen.

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  • wmaximusd Aug 13, 2008

    Figured it out. Just needed to adjust the screen and focus. Works great now.

  • wmaximusd Aug 15, 2008

    Got the parts on Ebay from a guy (sewsales55), his store/web site is Suburban Electronics. The flyback transformer was about $11 and the Horizontal Output Transistor was about $2, with shipping the order came to less than $20.



    I'm pretty good with mechanical repairs but electronics has always been a bit of a challenge. I practiced soldering a little before I started and was able to finish the job in about 4.5 hours without any problems. Probably not a record time but the TV is as good as new now. We'll see how long it lasts. My television had been unplugged for a few weeks so there wasn't any juice left in the capacitors but make sure you discharge them before you start.

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  • RCA Master
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I am proud to see you got your set working Good job!

Posted on Aug 26, 2008

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How miuch was the repair can you do it yourself

Posted on Aug 15, 2008

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I HAVE SHARP COMPANY 21 INCHES CRT MY FRIEND TV SET PROBLEM IS SET DEAD IN POWER SUPPLAY TRANSISTER 1886 REPLACED AFTER POWER SUPPLAY IS OK FBT ARCKING THEN IMMEDIATLY SET SWITCH OFF SET IN CIRCUIT R6


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Nov 21, 2014 | Sharp Televison & Video

1 Answer

Picture on Samsung TXL2791F gets smaller after a few minuets


The horizontal output transistor that drives the flyback transformer overheats now. There might be other reasons too for this fault. If the flyback transformer has any internal winding short, this transistor will overheat.
Just replace the horizontal output transistor. Check its heat. If the newly replaced transistor too overheats, replace the flyback transformer.

May 24, 2012 | Samsung TXL2791F 27" TV

1 Answer

We replaced the transformer for our RCA F27650. It was sparking and now it is not, but now the screen won't turn on. It is just black. We hookd all the wires up like they were. we can hear sound, but...


Hello
Along with the flyback transofrmer, its horizontal output transistor also must be replaced. I don't know whether you have replaced it or not. If not, replace it too. It can be located very near to the flyback transformer, a three terminal component, black in colour, usually screwed to a metal heatsink. Then switch on the TV and measure the video output voltage at the video output card pluged directly to the picture tube neck. The collector of the video aoutput transistors must come around 145VDC. If it also is there, advance the screen control on the flyback transformer to get a raster. If that voltage is not there, it means that the flyback transformer is not working, and horizontal oscillator stage should be checked for oscillation, check the lined drive transformer for its primary winding open, Check the entire horizontal oscillator section. The collector point of the line drive transistor, the transistor that drives the line drive transformer, a small transformer soldered diretly to the printed circuit board; should be checked with frequency meter. The frequency at that point should come around 15525HZ approx: OK.

Mar 19, 2011 | RCA F27650 27" TV

2 Answers

Sharp tv primo 21`inch turn on red light only


check your horizontal transistor maybe it's shorted replace horizontal transistor or maybe the fusible fuses are open check for open resistors at the horizontal section of the circuit.

Dec 22, 2010 | Sharp Televison & Video

2 Answers

I replace horizontal output transistor with new one but it happens the same short


check yoke coil for open ckt, and and check for 12 v dc supply to vertical circuit, sometimes resistor open that supply dc voltage coming from flyback transformer.

Apr 27, 2010 | Televison & Video

1 Answer

Find a horizontal output transistor or flyback


Flyback transformer part number for a tv RCA F32648

Mar 06, 2010 | RCA F32648 32" TV

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 Televison & Video

1 Answer

Tv problem


The F27442 uses the CTC203 series chassis and that symptom is very common. If the horizontal output is shorted you MUST resolder the coil in series with the base of that transistor and the pins of the small horizontal drive transformer. When they have been properly resoldered you can put in a new original horizontal output transistor. If the output transistor shorts out again then your flyback (high voltage) transformer is shorted and needs to be replaced.

Aug 08, 2007 | RCA F27442 27" TV

3 Answers

Sony KV-32S40


When the horizontal output (2SC4927) is shorted it means one of 2 things is wrong - the horizontal drive transformer has cracked solder joints or the flyback transformer is shorted inside. If the solder joints on the horizontal drive transformer (the small grey transformer connected to the base of the horizontal output transistor) are cracked then the set will play for a little while and then the parts you just replaced will again be destroyed. ALWAYS resolder the driver transformer when replacing the parts you mentioned! When I replace the parts you mention and I do not see any obvious cracks on the driver transformer then I unsolder the B+ pin of the flyback (labeled 135, for 135 volts) and put a 60 to 100 watt lightbulb (drop-light) in series with the flyback. This means that the 135 volts B+ goes through the lightbulb and then into the flyback, so the lightbulb acts as a current limiter to protect the horizontal output. When you turn the set on the bulb should glow no more than about half bright and you should hear the high voltage come up, but you should not see a picture. If you turn the set on and the bulb glows as bright as if it was plugged into the wall then you can bet that flyback is shorted and must be replaced.

Jul 12, 2007 | Sony KV-32S40 32" TV

2 Answers

No power


Check the FBT and the Horizontal Output Transistor also.

Sep 18, 2006 | Panasonic TX-15AT1 15" TV

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