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Model Sony KP48S35 here's a good trouble first H output was short, change it and blow again Find that the flyback was defect, change it and then tv turn on But only have 3 horizontal line (R,G,B) at the bottom , like no vertical deflection when I press chanel up, tv shut down I change the eprom, same trouble I change the ic001 , same trouble then I change the ic301 (CXA2025AS) everything work fine after execpt I have a bad convergence, I can't have a straight horizontal line at the top and the bottom when I adjust the vbow on the top the bottom is worst the midle of the top and the bottom are both curve to the center and there is no adjustement to adjust only the vbow at the top and the bottom also change the 2 convergence ic's and vertical , no result anyone can help??

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  • audioshop Apr 28, 2010

    Thank you very much
    i'll put back the old eprom
    will take less time



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Put the old NVM (eprom) IC back in if you have it. If not, you will have to reconverge and adjust the picture. This is a long process and there is an important bit of information you should know before you even turn the TV on. The replacement eprom does not come with any preset memory settings. Because of this the deflection current could rise causing the fuse to open. Before powering on the TV, unplug sub deflection connectors on the G board they are CN-801, CN-802, and CN-803. Color-coded red, white, and black. Adjust the main H/V size and position first. Apply the standard deflection data if you have it , otherwise, here is a starting point:

Model Sony KP48S35
here's a good - 896100b.jpg
Then you need to connect 1 subdeflection yoke at a time and make rough adjustments. Once you have the first rough adjusted, leave it connected and then move on to the next one. The point is not to overload the STK Vcc and blow the fuse. Sorry, this is going to take you a while to correct... there's no way out of it. The production line equipment can do it in about 2 minutes... us humans, it can take 4 hours or more. I hope this gets you to a working point. Best wishes.

Posted on Apr 28, 2010


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Helo sir, i have a L.G T.V. Model No blowing the horizontal output..i change the flyback tranformer ,bt is still blowing the horizontal output

Check all the capacitors connected to horizontal output transistor. Especially one connected with its collector to ground. a high voltage [1.5Kv]. capacitor. Replace them. Check for any short inside the winding of the yoke. It is difficult to detect the winding short inside the yoke. Connect an other yoke in place, after pulling out the CRT base card out of the TV. This you can make sure about the condition of the deflection yoke.

Oct 02, 2012 | Televison & Video

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I have replaced the horizontal output transistor for my 32 inch Sony Trinitron but it still won't power on. Two blinks on the stand by light, how do you correct the overcurrent protection fault. Thanks!!

I would first be suspicious of the flyback transformer if the HOT was shorted. I have also found many Sonys with shorted video output i.c. s which are on the CRT pc board. I do not recall if this model uses one output i.c. or three separate ones. Either way you can unplug the cabling feeding the crt board and try powering the set again. If the high voltage comes up you likely have a shorted video i.c. (The i.c. s short most likely because the crt momentarily arcs.) If this test does not result in a clearing of the over current problem I would, as I said initially, suspect the flyback. There are other possible causes, but those are the two I have seen most often.

Nov 10, 2009 | Sony FD Trinitron WEGA KV-32FV300 32" TV

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I have two Sony KV-27FS120, they have the same problem, 4 blink, both have no vertical & horizontal drive from IC001 jungle chip, and Q505 horiz output blow. Circuits between them look good. I replace...

Check very carefully for cold solders on horiz. drive transformer also replace the electrolytic cap that shapes the horiz. drive signal - if you have a scope and manual compare the drive signal shape.
Some times using poor after market horiz o/p's also causes the problem - does the o/p heatsink get to hot to touch or does the horiz o/p blow immeadiatly?

Oct 19, 2009 | Sony FD Trinitron WEGA KV-27FS120 27" TV

1 Answer

Sony 2167 No power on

I have not worked on your particular model. But, I have serviced many TV sets over the years. My answer will ge generic.

Check all the capacitors in the horizontal output stage and power supply areas for high ESR. All the caps that are out of spec must be changed.

The high voltage multiplier & flyback can also cause the fault you are having.

You have to consider that the DC voltages are not the only important spec that has to be met. There are also many power drive signals that work with reactive devices. If there is any defect in the critical areas there will be failures.

Jerry G.

Nov 26, 2008 | Sony FD Trinitron WEGA KV-21CL10 21" TV

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Wont startup

Youre flyback is defective.Its an easy repair your flyback is 145328551 which is no longer available but the substitute flyback is thats available at the following link and they provide free tech support with instant messageing so you can replace the flyback yourself. You need flyback 145328511 you can get it at this link with free shipping also. I use them all the time they are a good company with qiuality parts and free tech support.

Jun 27, 2008 | Sony KP-46WT510 46" Rear Projection HDTV

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Picture and sound went out suddenly on a Sony KV-35S40

sony has problem with bad picture tubes as well as flyback transformers .if you have shorted hori output then replace it if set shorts it out again your looking at bad flyback transformer as well as maybe leaky tube.

Oct 27, 2007 | Sony KV-35S40 TV

1 Answer

Tv dead

no problem

replace by same number.

but remember before you replace check the following.

  1. check for normal output from power supply.
  2. check components connected to flyback capacitors & diodes.
  3. check for print short.
  4. while replacing h/output be careful to check heat sink compound & mica sheet normal.
  5. put on the set
  6. if still it blows then flyback transformer is faulty.
  7. hope this will help.
  8. good luck.

Oct 11, 2007 | RCA HD56W58 56" TV

2 Answers

RCA big screen tv

whenever fuse blows every time it is the indication of short circuit in tv. so please do not put fuse unless you know the cause of blowing fuse. these are the reasons of blowing fuse. 1 main filter cap.short. 2 rectifier diode short. 3 swithing transistor short 4 horizontal output transistor short 5 caps & diodes connected to flyback transformer short. 6 print short. 7 at last if every thing ok then flyback transformer defective. hope this will help. if you are not a tech person call skilled tech to fix it. good luck

Sep 24, 2007 | RCA P60828 TV

1 Answer

No power.

Usually, in those Sony sets, a crack developes on a small transformer in the horizontal drive circuit, which causes the horizontal output transistor to short. This immediately shorts out the switching transistors in the power supply and blows the Sony 0.1 ohm resistor fuse. A shorted flyback (high voltage) transformer will also have the same result. The power supply does NOT need to be replaced. The parts should be replaced, the flyback checked and the board resoldered by a qualified tech familiar with Sony sets.

Aug 23, 2007 | Sony KV-32V35 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.

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