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Horizontal flyback lines on my pc screen - Computers & Internet

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Problems with video chip or conection with lcd and motherboard.

Posted on Mar 15, 2011

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I have sound but only a black screen on JVC LT-20DA6SK


Is there a light from the CRT filament? if so.. adjust the "screen" screw at the back of the Flyback slowly. Measure the G2 pin for almost 4k to 6k DC volts, dont let the screen shows horizontal lines or flyback lines.

Sep 30, 2014 | JVC Televison & Video

1 Answer

White horizontal line is coming how to solve this


Since you changed the flyback did anything change? If not, you may want to take a close look at the horizontal peaking caps or the horizontal electroltic capacitor. I hope this helps.
If I can help any more, email me at wyoed1@aol.com
"Original Radio Man"
Ed

Feb 13, 2013 | Televison & Video

1 Answer

We replaced the transformer for our RCA F27650. It was sparking and now it is not, but now the screen won't turn on. It is just black. We hookd all the wires up like they were. we can hear sound, but...


Hello
Along with the flyback transofrmer, its horizontal output transistor also must be replaced. I don't know whether you have replaced it or not. If not, replace it too. It can be located very near to the flyback transformer, a three terminal component, black in colour, usually screwed to a metal heatsink. Then switch on the TV and measure the video output voltage at the video output card pluged directly to the picture tube neck. The collector of the video aoutput transistors must come around 145VDC. If it also is there, advance the screen control on the flyback transformer to get a raster. If that voltage is not there, it means that the flyback transformer is not working, and horizontal oscillator stage should be checked for oscillation, check the lined drive transformer for its primary winding open, Check the entire horizontal oscillator section. The collector point of the line drive transistor, the transistor that drives the line drive transformer, a small transformer soldered diretly to the printed circuit board; should be checked with frequency meter. The frequency at that point should come around 15525HZ approx: OK.

Mar 19, 2011 | RCA F27650 27" TV

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My TV has been acting strange lately. When I turn it on, the screen looks purple and has these horizontal lines up and down the entire screen. They don't expand to both sides of the screen, though. WHen...


there seems to be a problem in the horizontal circuit...there is a control on the flyback transformer that is labeled "screen". (you'll have to take the back off) The flyback is the component that looks sort of round with the red high voltage lead coming out the top and connecting to the top of the picture tube.On the back of the flyback there will be 2 or 3 controls if 2 there will be 1 focus and 1 screen, if 3 there are 2 focus and 1 screen..using an insulated flat blade screwdriver, slowly turn the screen control counterclockwise to see if this will make the lines go away...if not then there is a horizontal cicuit fault and quit possibly a pincushion problem(hourglass effect)..these will need to be checked by a service shop

Jan 22, 2011 | Sylvania 6432TFY TV

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Three coloured lines appered on the screen - no picture


If there is no picture and 3 vertical lines in the center of the screen, stop. Turn off TV. You have no horizontal deflection happening. Lines will burn into crts and be permanently visible after repair.

No horizontal deflection is caused by Horizontal sweep circuit failure, maybe flyback transformer and associated components. More than a simple do-it-yourself repair.

easyab

Apr 22, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Deefekt with the Monitor AOC 7klr


The flyback transformer is normally at the Horizontal section of the monitor's mother board, It sounds that your flyback transformer might be the cause, bright intensive white lines can be fly back defective. . Try changing your flyback cause I encounter a problem similar to this and it works.

Nov 14, 2008 | Computers & Internet

1 Answer

RCA F32650 32" White lines with hazy white flickering


Absolutely right about the transistor and also check any adjacent resistors to the transformer and to the line output transistor. Good luck.

Sep 19, 2008 | RCA F32650 32" TV

2 Answers

Horizontal 'pinstripe' lines on all channels


sound like the screen control on the flyback is set just a little too high. the flyback has the red wire attached to the tube. the flyback has 2 small adjustable controls. if you look close enough 1 is marked focus & on is screen. turn the screen slightly to the left & look at your picture. the screen is like a master brightness & if it's up too high you will see what is called retrace lines. good luck.

Jan 16, 2007 | Daewoo DTQ-20N3FC 20" TV

1 Answer

Tv showing blue screen with flyback lines sound ok


Flyback lines? Is the picture all white with no brightness control with faint horizontal faint lines? If this is what you are saying, the screen voltage could be bad, and if thats the case, the picture tube or the flyback itself could be bad. You could also have a bad connection on the crt socket

Dec 27, 2006 | Philips Magnavox 20MT133S 20" TV

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