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Panasonic TV has blank screen with retrace line

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Retrace lines usually means screen voltage is to high . that could mean bad picture tube.or flyback.

But there is something you could try. Be careful high voltage.on the back on the flyback transformer there to adjustments screen voltage and and focus go slightly counter clockwise or in your case clockwise that pot addustment will make it darker or lighter.If this does not fix it you have a flyback oy tue problem.
I hope this helps thanks doctor video leadingedgeelectronics 1987

Posted on May 03, 2008

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Tv showing with lines, screen blank but hearing clearly.


its white retrace fault, check video section or crt internal short problem

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Panasonic ctp2780sf no picture faint line going vertical across screen


There are two reasons for this fault. A fault smoothing capacitor at the video output voltage rail, or excess of screen voltage. These lines are called 'vertical retrace lines' technically. Check this link for more details. It has a post, which have information regarding this fault. Go to older posts there.

Dec 25, 2012 | Panasonic Televison & Video

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I have a panasonic tv with retrace lines at the topI


If you can locate the vertical IC you are nearby!. You will have to resoder the grounds on the vertical IC and any cap in the immediate area of this vertical IC is weak. I would replace them all as they will pull each other down. There may be four caps and the largest one, possibly a 25 volt 2200MF would be the only good cap. I dont have the specs on this set, but this will surely lead to a good repair!

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2 Answers

How do you repair or rather remove the retrace line on screen there is no picture


You have may the brighteness set up too high. if not retrace blanking is faulty. try turning the brighness down a bit.

Dec 19, 2009 | Daewoo DTQ-13P2FC 13" TV

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.
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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

1 Answer

Lines on the screen


Are they thin, white lines running east to west? If so, they are called retrace lines and indicate that the screen settings for the picture tubes is set too high or there may be a mal-function of the CRT driver circuitry. Try adjusting the screen controls which are located behind the front grill of the TV behind an access panel. Once you remove the grill and access panel, you'll see a small control assembly the has two sets of controls. Three for adjusting the red, green, and blue focus, the other, the red, blue, and green screen controls. To adjust correctly, put the TV on an unused input(dark, blank picture) and adjust until there are no visable retrace lines or color in the image.

michtech

Feb 14, 2009 | Panasonic PT-51HX41 51" Rear Projection...

1 Answer

Switches off after 3 to 4 secs--little bright screen hor line and small retrace lines


On the my sony website, they said try unplugging the set for 3 or 6 minutes. Then plug it directly to the wall. If that don't work, and it won't; seek a service center. I have the same problem.

Next time we better buy Panasonic. Sony products fail ALOT. I had a 5 disc DVD Changer and it was defective and it was part of a class action lawsuit,

I believe this is the same sort of problem.

The sony Vaio laptop computer gets consistent poor reviews.

I brought an alarm clock and its back up battery never worked right out of the box.

I brought a cordless phone and the LCD display went blank.

I am so DONE with Sony.

Good name; Bad products.

Aug 23, 2008 | Sony KV-24FV12 24" 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

21PT3324/71 Philips TV wont stay on


Try this: On the flyback transformer, raise the SCREEN voltage. There are 2 controld on the flyback - the top one is FOCUS and the bottom one is SCREEN. As the tube ages its emission decreases, and the computer monitors the tube's emission. When the emission gets to be too low, the computer shuts the set down. This is exactly like IK blanking in Sony sets, except Sony blanks the video and Philips shuts the set off. To set the screen voltage properly, turn the brightness and contrast to 0, raise the screen voltage until you see the white retrace lines in the picture, and then back down on the screen voltage until just past the point where the retrace lines are gone. Reset your brightness and contrast and the set should play fine.

Aug 13, 2007 | Philips 20PT6441 20" TV

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