Question about Sony Standard (CRT) Televisions

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Sony KV29C3A 100Hz

Hi! I have problem with my Sony 8 years old .The screen is much bright(almost gray) and are visible some horizontal line (almost like a spring).Going to the center of-the screen those line are shorter in lenght.
Any ideas

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  • 63 Answers

Hi,

This will almost certainly be a problem with the Line output transformer, sometimes known as the flyback transformer. It will need to be repaired by a qualified technician I'm affraid as there are dangerous voltages on this part even with the set unplugged from the mains.

Sorry for the bad news.

Andy

Posted on Jun 26, 2008

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Hi, I had a problem with my Sony CRT television.


The faint background lines are vertical flyback lines. Start your diagnosis by turning the brightness and contrast controls to minimum and view the screen in a darkened room. If you can now see a raster with horizontal lines visible then it is likely that the tubes A1 screen voltage is excessive. The screen voltage is usually within the range of 400v to 600v. Adjustment for this is often part of the flyback transformer. Check all high value resistors
in the screen and focus circuitry. Some of these reistors may be
built into the flyback transformer. As the picture gets brighter the beam current increases, this will eventually cause the X ray protection circuits to trigger shuting off the set. A fault in the video drive circuits to the cathodes of the tube will cause similar symptoms but usualy results in a predominance of one colour, ie
bright red, blue or green raster with flyback lines.

Oct 20, 2013 | Sony KP-53HS10 TV

1 Answer

KV-HP212M83 greenish blackout blinks 2 times


Measure B+ on the set , If normal check G2 voltage


G2 adjustment is on the Flyback Transformer

Oct 14, 2012 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

Fine interference lines running diagonally across picture.


Hi There,
Sounds like your Horizontal Output Circuit is leaking current causing diagonal lines across the screen. I hope this will help and thank you for using FixYa!

Mar 29, 2009 | Sony FD Trinitron WEGA KV-36FS120 36" TV

3 Answers

TV: bright line across black screen for several hours.


vertical output ic needs to be resoldered. careful leaving that bright line displayed on the screen as this will cause a permanent phosphor burn into the tube. this can not be corrected once burned unless you replace the tube. mch

Mar 08, 2009 | JVC Standard (CRT) Televisions

1 Answer

Gray screen with horizontal lines accross it


sounds like you may have a bad ic it probley is a surface mount on the bottom of the board it could couse this problem would need to take to a shop to repair. The ic probley is numbered ic101 on board.

Mar 01, 2009 | Sanyo DS32224 TV

1 Answer

Sony KV29C3A 100Hz


Hi,

It's almost certainly the transformer itself but with the fault you are getting it wouldn't be something that can be measured with a meter.

Regards

Andy

Jun 27, 2008 | Standard (CRT) Televisions

1 Answer

Tube TV - one thin horizontal line of bright light


Vertical defection failure. Common failure. Pretty easy to repair ($50-75?). However, my general rule of thumb is not to waste any more money on TVs over 10 years old. Too much other stuff in there ready to fail as well.

Jan 24, 2008 | Standard (CRT) Televisions

1 Answer

White horizontal, zig-zagging lines


It sounds to me like you're describing the re-trace of the unit. It is repairable, and more so the sooner you get it to the repair facility.

Nov 21, 2007 | Sony FD Trinitron WEGA KV-27FS120 27" TV

1 Answer

Screen went full bright one day.


Hello, please check the 10uf/200V capacitor around flyback transformer. Best regards, Arpi

Jul 17, 2007 | JVC AV-27230 27" TV

1 Answer

SONY KP-46S25


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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