Question about Sony KV-32FV27 32" TV

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Horizontal Sync Problems with Sony and Mitsubishi sets

I have seen a recurring problem in Sony and in Mitsubishi TVs I have attempted to work on, in which the on-screen menu appears normally, but any kind of video input to the A/V jacks or a from the tuner results in a skewed picture that can't seem to sync up. I am inclined to think its a circuit or part that is common in these models that is not taking the sync signal from a video input. Can anyone shed some light on this one?

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Check this site for more info.
You can also let me know the chassis number, so I can try to locate an schematic diagram.

Posted on Mar 16, 2008

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I have this horizontal flickering problem on my philips 191EI.. Anyone know how to fix it? Thanks

This is not horizontal flickering. The picture is out of synchronization. The problem should be with its sync; separator stage circuit. For most modern TVs, this section will be a part of and IC, and is not repairable. Check what number IC is used as system-chorma-video jungle. It is faulty. Replace it. Before replacing, check all the components connected external to it. For details. You're seeing an out of sync: picture on screen. In this case, audio will be almost OK.

Nov 25, 2013 | Televison & Video

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On tv modelKV-27S42 it will not power up,Power light blinks 3or4 timesand relays do engage but no screen voltage. Can't feel hair on forearm when attempting to power up.Please help

Can be due to fault in the line output section , possible short in the EHT or there is no horizontal drive.
Need to check the +B voltage and also the sync from the IC.

Aug 08, 2011 | Sony KV-27S42 27" TV

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Standby light blinks seven times. Set will not turn on.

Your TV has a horizontal deflection failure problem. This may be due to Horizontal Output Transformer, or its driver transistor failure. You just do one thing. Disconnect it from AC mains, wait for some time, say 5 minutes or so, then reconnect it again and switch on your TV with its power switch, and see whether it working or not. If not, open your TVs back cover, after disconnecting it from the mains power supply. Horizontal Output Transformer {FBT}, otherwise known as Line Output Transformer [LOT], can be seen prominatly on the circuit board. It is a high frequency stepup transformer, that give all the working voltage to build up screen in the picture tube. It looks like a cylindrical in shape, and one of its wire will be seen sucked to the top of the picture tube with the help of a rubber ******.
Beside the above said LOT, very near to it, will be a transistor, horizontal output transistor, which in turn drives the LOT, can be seen screwed to a heatsink. If thei transistor gets leaked, collector to emitter, or base to collector, whichever may be,it will give an effect of direct short to the secondary positve power supply rail, ie 135vDC regulated supply. This may be the first rason for a seven times blinking in Sony TVs.
The second reason is LOY itself has a shorted winding developed inside. While the above said transitor fault can be measured with the help of a multimeter, LOT trouble cannot be measured by normal methods. If LOT has shorted windings insie, it will also cause a short to the above said supply rail, and will give seven blinks. You just solder out the above said transistor from the circuit board, ad replace it with a same type and humber. Switch on the Tv for a short period of time, say 30 seconds or so, plug it out from the AC mains, and touch with your bare fingers on the trasistor we have replaced, and feel its heat effect. It may be warm, but not too hot. If TV works this time you can make sure that the transistor was faulty.
If it turns very hot during this short period of time, make sure that the LOT has got damaged. Replace it with the same type and number. OK.
Take every precautions before opening your TV. As high as 28,000VDC points are there inside your TV while it works. Keep chlidren away from you, not even allow them to stand beside you, and allow an adult to be there eith you. Each time you contact the tv, make sure that it is pluged out from the wall socket.
have any doubts inform me through fixya. OK.

Nov 03, 2010 | Sony FD Trinitron WEGA KV-32HS510 32" TV

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My sony tv model no.kv-32fs100 screen goes black sound still on

If your TVs sound is Ok, and there is no picture means there is some fault in the horizontal output section inside the circuit bord of your tv. No Extra High Tension Voltages are generated in it. It may be due to Horizontal Output Transformer, usually say as [LOT], or its drive circuit, or line drive transformer failure. You can check if [EHT] that is Extra High Tension Voltage is genrating inside your TV or not.
Place your forearm parellel to the outer surcace of the picture tube, at about 2cm apart from it, and switch on your TV. If there is EHT geterated inside, the hairs of your forearm will be attracted towards the surface of the picture tube, and you can feel it. If it is not, there will be no attraction.
[1] If it is:- there is no screen voltage is coming to your picture tube. In most of Sony TVs the screen voltage is coming from one point in the printed circuit board, and its adjustment control is placed on the base card of the picture tube. Focus votage and screen voltages can be adjusted.
[2] If it isn't:- Your TVs LOT mentioned above has got damaged. LOT damage is is a general case in all TVs. Some times the driver transistor which drives the LOT also may also get damaged.
You just unplug your TV from wall socket, and open its back cover without damaging anything. Point out the horizontal drive transistor, usually can be seen very near to the LOT, screwed into a heatsink metal. Without touching any inside part, power on your TV. Wait for 2 minutes or so. Just power off and unplug it from the wall socket, and touch with your bare had on the transistor heatsink. If LOT is shorted, the transistor will be very hot during this time, and an "Ishhhh" sound also will be heard. If you have sufficient equipments, desolder and take out the horizontal output transistor mentioned above, and check it for collector to base leak. If it is leaky replacing it with same type and number will solve the problem. Anyway it should be replaced along with LOT replacement. Therefore just do it first. If the replaced one also overheats, surely LOT is damaged and it should alo be replaced with same type and number. If there is no heat in the transitor and if no hissing sound is heard from the LOT side, check for its [LOTs] supply voltage. It shoud be around 135 to 140VDC in 32" Sony sets. If there is no voltage, just track the circut print for any crack or have any series resistor failure.
If there is supply voltage to LOT and still it seems not working, come towards the Line Drive Transformer. It is a small transformer can be seen on the circuit board diretly soldered to it. If its winding gets opend, there will be no frequency [15625Hz] to drive the Horizontal Output Transistor. For all these checks you must have a multimeter and a soldering iron in hand.
Please remember how the TV was shut down. If it is during on working, and a sudden faulure it was, surely LOT is faulty. There is no doubt about it. Anyway take precautions before opening the back cover. Keep children away from you and let an adult beside you too. As much as 27KVDC [27,000VDC] points are there inside your tv. It is dangerous to touch. You can see that voltage wire, which comes from the LOT, and connected to the top side of the picture tube, seems to be sticked with a rubber boot to it. Never go nearby its side any part of your body.
you must have some skill, causiousness and more patience to do this work. Otherwise get help of any experience technicians for this job.
If you feels any difficulty; please inform to Fixya, and they will give me alerts. I'm here thousands of miles away from you and trying to solve your problem by understanding from some words of yours you remember. Anyway wish you sucess. Take care.

Oct 21, 2010 | Sony FD Trinitron WEGA KV-32FS100 32" TV

1 Answer

Sony KV-32FS120 dead

It is impossible to guess at the parts without actaully troubleshooting the set with the proper setup.

From past experience, the areas that the fault for this normaly is, are the horizontal output ampliifer, main power supply, and sometimes there may be a problem with the vertical deflection amp.

In the horizontal output stage, with this set many times I have seen the flyback and output transistor go defective. When there aer problems in these areas, most of the time the power supply is damaged.

What is interesting, is ou say that this set is about a year old. In actual fact, this model is about 5 to 7 years old.

Considering the age of the set, I would be seriously looking at getting a new set rather than put money in to this one. This model is obsolete, and many of the parts for it are no longer availabe.

Jerry G.

Jun 10, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

Sony kv xj29m50 no picture.

If I understand you correctly:
The horizontal output transistor in your TV blew.

You replaced it with a BU2520DF.

I'm not sure what you mean by "change to dynamic mode".

Dynamic what?

Usually, horizontal problems in TVs are caused by bad capacitors in either the sync circuit, the driver circuit, the geometry circuit or the output circuit.

When I repsir problems like this I use an oscilliscope to find which stage is not working properly, then start substituting the capacitors in that stage until the problem is solved.

Look for large orange or blue ceramic or polyprop capacitors with bulges or cracks in them.

Look for electrolytic capacitors with bulging tops or shrunk cases.

Check and make sure no resistors are brown, they may be blown.

Use an ohm meter to test low value resistors in circuit.

If you don't have an oscilliscopw, that's about all you can do.

Jan 31, 2008 | Sony KV-XJ29M50 29" TV

1 Answer

Rolling screen!

The sync is automatic and controled by the uPC. It is strongly not recomended to mess with the factory service set-up. There are no so-called user adjustable controls for the horizontal and vertical frequency on this model.

The fault is usualy failed components in the sync seperator and sync amp sections.

An experienced TV tech can troubleshoot this and replace the necessary parts for you.

Jerry G.

Nov 17, 2007 | Sony FD Trinitron WEGA KD-36FS130 36" TV

2 Answers

Mitsubishi CK-3513R - Horizintal white line

this ic is soldered onto the board with a heat sink it is related to horizontal circuit.your problem could also be the flyback.good luck

Apr 12, 2007 | Mitsubishi CK-35308 35" TV

1 Answer


A "Gray Scale" adjustment may solve you problem. If one of the picture tubes is set too high it will cause these RETRACE lines. Then too a weak picture tube might cause this. If the horizontal lines are one color: red, green,or blue then whichever color that is shown would tell you which tube is set too high. Your set has 3 screen controls that control the brightness of each tube. One may need to be turned down a little. Stargazer

Mar 11, 2007 | Sony KP-46S25 TV

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