Question about Sony KV-35S40 TV

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No video set comes on picture dark , hi voltage ok , sound ok , every so ofton the picture comes on for a few second then goes off

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Re: no video

Try to resolder the flyback side,the vertical section,and the regulators.

Posted on Oct 19, 2007

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try checking the tv/av tact switch,if it is grounded or normally close or has a resistance with pressing, replace it with a new tact switch..

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Power supply is not ok?

In a standard set the power supply produces one large voltage and a few smaller ones---if the High voltage circuit comes up it creates the rest---this answer is based on the description that this is a set with a picture tube and not a LCD set.

Dec 07, 2012 | Panasonic TC-2119R 21" TV

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When i turn tv on it gives me a picture for 1 second then goes blank, we still have sound


Sounds like you have lost video somewhere in the video circuits. Possibly the picture tube could have gone bad or lost filiament voltage.
You can check to see if you have high voltage by holding your bare arm close to the screen. The hairs will stand up if you have high voltage. Absence of high voltage will also cause a black screen,but the sound might not work either since on some sets the power for the sound is supplied from the same circuit as
the high voltage.


Jan 30, 2011 | Standard (CRT) Televisions

1 Answer

TV goes to green, sound stays on a few seconds then TV shuts off.

Sounds like you have a bad picture tube. More than likely the CRT could be shorted, which would cause the set to shut down.
My first advise would be to power up the set with an isolation transformer with the voltage about 60% approx. 72 Volts AC, and monitor what happens when you increase the voltage slowly.
If the set remains on at 60 -70 %, then when increased to 90 - 100% it shuts down, you have something drawing too much current ( which could be the CRT )

Sep 14, 2009 | Sony FD Trinitron WEGA KV-30HS420 30" TV

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Sony kv 27V15: No picture but sound

Hi! the trouble indicates that your television's picture is the culprit, have your unit check by a qualified technician for verification.

Sep 12, 2009 | Sony KV-27V15 27" TV

1 Answer

Picture weak and stays on only a few seconds.

Hello tellis356,

He replaced the Integrated High Voltage Transformer (IHVT) (I so hate the term flyback even though it is descriptive of the function of the component). However he may have only solved part of the problem. My next question is did he perform a diagnostic on the CRT (picture tube)? It may well be the CRT, but I would first suggest that you have the repairman check the voltage and signal levels in the horizontal section of the TV and check the video signal and voltage levels at the output of the Video processor to the CRT socket board. Then after these are tested and proven to be within specifications, then run a diagnostic on the CRT using a CRT test set. This way he'll know for sure if the problem is in the circuitry or the CRT.

I am suspecting that the first trouble you experienced was the set was completely out? If so that is why he may have replaced the IHVT. He should have also replaced the Horizontal Output Transistor because it is in series with the IHVT and would have taken some of the damage that the IHVT would have sustained. So having him check that too would not be out of sorts.

I hope this helps,

Thank you,


Nov 14, 2008 | Sony FD Trinitron WEGA KV-36FS120 36" TV

1 Answer

Picture goes dark

1 your problem is in video section 2 if it is ok then check power supply for any components defective.

Sep 15, 2007 | Sony FD Trinitron WEGA KV-32HS500 32" TV

1 Answer

Toshiba 27 Inchs, the immage dsiappear after few minutes, then i have to swich the Tv off for a while

If the picture is fading slowly out it could just be a cold solder connection on the ctr board or the Hi voltage circuit that supplys the filiment voltage to the crt. To check this you have the back off and when the pic goes out you look at the crt to see if its still lighting up. if its not then you gotta find out where your missing the filiment voltage at> If there is still a light inside the tube when the picture is dark then it could be a PIP problem or in the video section /video jungle IC on the set. Now these sets have alot of high voltage inside them even when the sets unplugged so I advise against going inside and tweeking with the set unless you know all the safty issues with the Hi voltage and storage capacitors inside this set. there are no real user serviceable parts inside these sets and should only be serviced by a quilified service person. Good Luck

Jun 16, 2006 | Toshiba 35AFX54 35" TV

1 Answer

TV works fine for about 1hour.....then the picture

You have a problem in the Hi voltage or horizontal drive circuit most likly. Its a slight possiblity that the video is going out because of a cold solder connection from the flyback transformer blanking pulse to the video/sync separator circuit as it does and has happened in the past. This set should only be serviced by a trained service person as there are no real user serviceable parts inside this set. Good Luck

Jun 16, 2006 | Proscan PS36800HR 36" TV

2 Answers

Tv screen goes black for a few seconds

do you get sound while screen does black? what do you mean by "until eventually it has turned black and will not come back"? is it black from the minute you turn the tv on untill you turn it off? if sound is good but picture is black, it may be the resault of a fried monitor tube, in this case replacement will cost alot. if sound is dead also, them it is probobly power supply related issue. get out your DMM and measure the voltages in the power supply. When the screen goes black, is there still regulated B+ going to the circuitry? Do you still have HV? Is the filament of the CRT lit? Does the set still have a raster (you may have temporarily increase the screen setting to see it)? Do you measure any of the flyback derived B+ voltages that go to the video processing, tuner, Vertical Deflection, and other circuitry?

Mar 19, 2006 | Samsung TXD1972 19" TV

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