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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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I have a 51HW40 sony TV. A few problems green horizontal retrace that curves flashes green and turns off (about 2 times a month) I wait turn it back on and its fine Codes that have been tripped: 6: Low b ...


Hello: Have you tried to adjust you Green Screen control on the focus block assembly. located behind the front panel assembly. Here is a solution that might help you, turn off the green by turning off this control, make sure u look at the block and make sure you are not turning the green focus knob instead of scrn crl. Turning the control slowly to the left the retrace lines should disappear as the green video darkens. Then turn the control slowly to the right just until the retrace lines reappear, then turn back slowly left just until the lines go away. If the screen is Blanking on green tube only then you have a video blanking problem on the main signal board. Or possibly a IK bias problem. It is also possible that the green CRT is defective. The FBT is not bad because the screens are lighting up indicating you have high voltageand heater voltage which is derived from one of the secondary windings of the FB. If it is a Blanking problem i would look into replacing the A Board assembly.

Sep 25, 2009 | Sony KP-51HW40 51" Rear Projection...

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Vertical almost clear lines running systematicly across the scree


Hello rockfordcam,

These lines are called retrace lines they are caused when the blanking pulse is insufficient to turn off the current to the CRTs (guns) during the retrace period (the time when the CRTs internal electron gun is returning to the start position after "painting" the picture on the screen). Since this is a signal problem, it will require troubleshooting to figure out why This is occurring. If you do not have a background in electronics and a working knowledge of TVs I would suggest that you have a qualified TV technician examine and repair this TV for you.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Jun 30, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

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Blank screen audio ok. Picture tube has a line only going up and down


adjust voltage G2 Screen. thats why have retrace line. resolder also CRT board.

May 31, 2009 | Proscan PS50700 50" Rear Projection...

1 Answer

Mitsubishi TV had horizontal lines across the screen and rolls up


Answer
ONE: Yes, the speaker mounted close/near to the set can be a cause of mischief; please move it further away and see if that helps clear up the problem. But, you must keep it away for several days before you will know for sure because it takes some time to degauss all the internal parts that may have become corrupted by the magnets in the speaker.

TWO: Yes, any set can be repaired the question is cost and wisdom. Old sets are sometimes not worthy of the repair simply because of the likelyhood that another failure will follow soon after. A big screen always invokes a repair charge of $200 and up. After a few of these you will wish you had put all the money into a new set!

THREE: The lines are most likely a problem in the vertical blanking circuits of the set. These are horizontal retrace lines that are supposed to be blanked out during vertical retrace of the raster. Think of it as a paintbrush that scans across the screen painting thin lines and when you get to the bottom of the screen it goes quickly back to the top, but during that time the horizontal, which is many times faster, has made several sweeps; so it must be blanked out during the retrace. The repair involves finding the guilty parts and replacing them. Usually this repair runs over the $200 somewhat.

FOUR: Prior to calling in a service tech try a hard reset to see if that will recover any of the circuit degradations. Merely unplug the power cord and leave unplugged for 4 hours or more. It may help. Or, it may not help; but worth a try since is won't cost you anything.

If the set is over 5 or 6 years of age it probably is not a condidate for any expensive repair. On the other hand, it is a Toshiba - and they make a fine set.

Hope this helps. Let me know if you have further thoughts.

May 09, 2009 | Mitsubishi WS-55511 55" Rear Projection...

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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...

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Sony KP65WS500 5 blinks


Hi,
1st set Brightness and Contrast settings to 50% at tv menu.
You need to cover 2 CRTs with any thing like thick paper while adjusting 3rd CRT.
For example, lets adjust Red CRT G2 volts, Select audio-video input 1 and cover green and blue lens with paper note-book and rotate Screen control up to level where you see retrace lines on projection screen, now decrease screen volts (G2) so retrace lines disappear and projection screen should be blank.
Now do same process with green and blue adjustment while other lenses should be covered.
Im not sure I conveyed it to you properly or not because English is not my 1st language.
Thank you.

Sep 23, 2008 | Projection Televisions

1 Answer

Sony 65 inch screen tv


The lines you saw, i;m sure they are the ones called retrace lines but know the failure could be located on the red CRT board. Most likely the video amplifier is defective and not necessarily the CRT.
What is the model number of your TV?

Jun 17, 2008 | Projection Televisions

1 Answer

I have a panasonic PT47WX51E projection tv. It is about 7 years old and I am getting some faint diagonal lines all across the screen. I was wondering wht the problem may be. Thanks


They are retrace lines , do they have a paticular color, red, blue green or white? Let me know and i should be able to help you with it.

Apr 13, 2008 | Projection Televisions

1 Answer

Green lines on my Sony projection


Those are called retrace lines and they are the result of the blanking pulse not having the desired effect. This could denote a problem in the Horizontal section of the TV. In this case the green gun is not being turned off as it goes back to the left side of the screen.

Sep 20, 2007 | Sony KP-57WS500 57" Rear Projection...

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