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.
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Re: Sony KV29C3A 100Hz
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.
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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.
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
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.
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.
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.