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SONY KP-46S55 GREEN RETRACE LINES ON SCREEN

The green screen control will adjust slightly. The adjustment doesn't last anymore. The green retrace lines keep appearing. I measured the voltage on the screen controls. Red & Blue are 400 vdc and can be adjusted, the Green is over 800 vdc and will not adjust down to 400 vdc. I reversed the green & red leads to confirm the green control was bad and the red retrace lines appear.

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SOURCE: 28PW9527 Retrace lines (?)

These adjustment controls are on the HT transformer. (Large plastic block on one corner of the main board - looks similat to a distributor cap on a car.) They are usually a plastic pot with a cross in the end to fit a flat blade screw driver. (This is the large blocks Philips TVs usually have three adjustments on the transformer:

  • Voltage
  • Screen high voltage
  • Focus
If you can locate these controls on the transformer, make a slight adjustment to each in turn, noting where the control position is before adjustment, so you can put it back.
When you have found the right control it will go brighter or darker.

Before adjustment, set the TV brightness control to about mid way. Ideally the screen should have a completely black image to show up the scanlines.

Adjust the control until the scanlines disappear. Do not over-adjust or the screen will appear too dark.

TAKE GREAT CARE not to touch anything other than the control. HIGH VOLTAGES

Posted on Mar 28, 2008

  • 2267 Answers

SOURCE: retrace lines in top of tv...

These lines are cause by defective capacitors in the vertical section of the TV. No adjustment will work unless the capacitors are replace. The values of the capacitors are between 1uF, 10uF or possibly a 47uF.
I do not have the service manual at this moment but you can google it by the model number of your TV.
Let me know if you need further assistance.

Posted on Jun 16, 2009

welcomejee
  • 10594 Answers

SOURCE: SONY TV PICTURE TURN GREEN WITHOUT RETRACE

Picture goes to high green with retrace lines that shows picture tube is defective and requires replacement.
Usually in above symptom, TV goes to standby mode and standby light blinks when green raster problem occurred.
New TV is better option because picture tube of KV-34XBR960 would not be available any more.
Thanks.

Posted on Aug 14, 2009

  • 1 Answer

SOURCE: TELEVISION CHASIS HAVING TDA 9370 SINGLE IC

Try zener from abl.

Posted on Sep 13, 2010

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My Zenith SG2721H has thin green horizontal lines across the screen.


Most "modern" CRT TVs have automatic color biasing which means a complete of manual control. Depending on how your set is manufactured, it may have a control for each color located on the neck board for adjusting the drive to each of the CRT guns.

What you're seeing is called 'retrace' and you're correct that this has to do with color blanking. The most common issue causing 'faint' retrace is too much drive to one of the CRT guns. Hopefully, your set has an adjustment to back off the drive for the green gun. If not, this can be the result of a bad capacitor or leaky transistor in the green circuit.

If all else fails, locate the SCREEN of G2 knob on the back of the flyback transformer and back it down a touch; sometimes this is all it takes.

Dec 14, 2012 | Televison & Video

1 Answer

NOISE LINES I THINK


Hello
These lines are calle vertical retrace lines. Try to eleimitate them by adjusting its screen control. Screen control is inside the Tv, can be located at the LOT.

Mar 02, 2012 | Sony KV-27V65 27" TV

1 Answer

I gotta a green screen


It is possible that you have a shorted green CRT, you can remove the front speaker cover, and you will fine a focus block, and if you turn down the green screen voltage, very slowly, the green should turn down. if not then the gun (CRT) will have to be replace, If it does turn down, then go into the menu and turn the color are the way down and that should give you a black and white picture. If it is not black and white. adjust the red, blue, and green screen voltages until you receive a good black and white picture. Turn slowly they are touchy, and if turn to high, you will get retrace lines and the TV will shut down.

Nov 14, 2010 | Toshiba 61A60 TV

1 Answer

SONY TV PICTURE TURN GREEN WITHOUT RETRACE


Picture goes to high green with retrace lines that shows picture tube is defective and requires replacement.
Usually in above symptom, TV goes to standby mode and standby light blinks when green raster problem occurred.
New TV is better option because picture tube of KV-34XBR960 would not be available any more.
Thanks.

Aug 14, 2009 | Sony Televison & Video

1 Answer

Have 46 samsung dlp that has green lines all over the screen . menu still works but doesnt go away on the menu mode. the green is so thick that you cant see any picture in the background.


Red, green, or blue retrace lines ( a quote from "Notes on the Troubleshooting and Repair of Television Sets", found at http://www.repairfaq.org/sam/tvfaq.htm#tvrgbrlin )

Where only one color is showing, suspect an incorrectly adjusted individual background/bias control or bad part on the CRT neck board for that color.
  • Individual brightness/background/bias control(s) - mark setting of pot for the problem color and then see if a slight adjustment removes the retrace lines. See the chapter: "TV Adjustments". Of course, if this happened suddenly, the problem is not due to a misadjusted control though a dirty pot is possible - turn it back and forth - this might clean it and restore normal operation.
  • Component or connection on CRT neck board - insufficient voltage to or incorrect biasing of the video driver for this color can result in the CRT never totally blanking. Compare voltages and signals, and swap components between good and bad channels to confirm.
  • Blanking circuit - this may be a part of the video/chroma chip or separate. Check and compare waveforms of good and bad colors to determine if the blanking pulses are making it to the video output.
There is a slight possibility that a bad CRT may result in visible retrace lines. To eliminate this possibility:
  • Disconnect the filament - all evidence of a picture, raster, and retrace lines should disappear once the filaments/cathodes have cooled (15 seconds or so. If there are still visible retrace lines, the CRT is suffering from cold or field emission from someplace (may not even be the cathode).
  • Turn down the screen (G2) control on the flyback (usually). If one color remains no matter how you set the control, again there is some kind of weird emission from the CRT. However, if white/gray retrace lines remain, the problem may be in the screen supply.
(quote ends)
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You will be greatly helped if you have a schematic for your TV set, and you may need to change some parts, clean some connector contacts and/or tweak settings inside the set, so remember the original settings before you tweak them...

Good luck

3rq8 (Triarcuate)

Jul 23, 2009 | Televison & Video

2 Answers

28PW9527 Retrace lines (?)


These adjustment controls are on the HT transformer. (Large plastic block on one corner of the main board - looks similat to a distributor cap on a car.) They are usually a plastic pot with a cross in the end to fit a flat blade screw driver. (This is the large blocks Philips TVs usually have three adjustments on the transformer:

  • Voltage
  • Screen high voltage
  • Focus
If you can locate these controls on the transformer, make a slight adjustment to each in turn, noting where the control position is before adjustment, so you can put it back.
When you have found the right control it will go brighter or darker.

Before adjustment, set the TV brightness control to about mid way. Ideally the screen should have a completely black image to show up the scanlines.

Adjust the control until the scanlines disappear. Do not over-adjust or the screen will appear too dark.

TAKE GREAT CARE not to touch anything other than the control. HIGH VOLTAGES

Mar 28, 2008 | Philips 28PW9536 28" TV

1 Answer

Green is going, going, gone?


I would suggest check the the secondary side of the power supply for around 130VDC if that voltage is found to be lower than 120VDC I would suggest to replace CP80 with a 100 mfd@250 vdc. Part # 218374
Check Globalsemi.com for these parts.

Jan 13, 2008 | RCA F36650 36" TV

1 Answer

Slow to come on, picture flashes black, 32" SONY tv


blankenship, the "IK circuit" is blanking your screen, only "fix" is temporary, remove back of tv, and on rear right side (facing into the back of the set) you can see 2 philips type plastic screws mounted on the flyback transformer, one is focus the other is screen, do not adjust focus , turn screen control clockwise slowly until you get white retrace lines on screen, then turn counterclockwise until retrace lines disappear, this increases drive from tube to IK circuit, will last anywhere from 6 months to 18 months and then it`s replacement time, questions? e-mail me back. good luck, BMW Rider

Jan 11, 2008 | Televison & Video

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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