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Frame flyback lines at top of picture - Televison & Video

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Hello re fault on ferguson tx 9 replacing R277[210k] with a180k cleared the fault
thanking you
Michael Cullen

Posted on Nov 06, 2008


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You have to tap firm sides of the Toshiba TV in order to see a picture

Hi Jaime.
Well it seems you have a dry joint or loose connection somewhere
in or to this receiver. Faults of this nature may at first seem straight forward but they can be very frustrating and often send you on a wildgoose chase.
The most valuable tool you posses will be patience and if you are still reading this then this virture in you is onfirmed. So let us continue.
We first need to narrow down the suspect area where the problem may be hiding. You say the picture is intermittent so I'm assuming
you still have sound. If you still have a raster (brightness on the screen) then the line oscillator, line drive, line output and EHT circuits are all functioning and your attention should be drawn to the composit video circuits in particular dry jionts on the rca video input socket your a/v cable is connected to (it's the yellow one)..
If you have only a blank screen did the disappearing picture
go to a horizontal line across centre of the screen just before going blank. If yes then the problem probably lies in the
frame output stage. Resolder all pin connections to the frame output ic (even if they look ok) and all pin connections on the flyback transformer (Line output transformer to some of us).
If the picture fades away rather than flashing off then look to see if the tube heaters are still glowing, If not resolder the heater pin connections on the tube base socket and all pins on the flyback
transformer. Stll haven't cured the problem ? Have a nice cup of tea before poceeding, you've earnt it by now.
OK once more into the breach dear friend, it's time to get violent
with this stubon beasty and start tapping the circuit board to find the most sensetive area and resolder all the joints you can find within a two inch radius of this point. The most common points for dry joints to occure are in the power supply, line output stage and
frame output stage (vertical stage to even more of us)
Good luck Jamie. Best regards from Vintie

Jan 04, 2014 | Toshiba CF36H50 36" TV

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No picture

No picture can mean different things to different people. To a technician it often means no raster. Since we have sound it most likely means we have no EHT supply to the tube and our attention will be drawn to a problem in the line output stage. But television receivers are devious litle devils and often hide the true nature of the problem. A fault in the frame output stage often results in a blank screen. Shurely not you'd get a bright horizontal line across the screen I hear you say (my good hearing is a result of listening to peoples service problems for the last fifty years) well no since
in most sets the beam limiting will take effect, blanking the raster to prevent image burn on the screen. If you increase the A1 voltage on the flyback transformer, it's right next to the focus adjustment you will see the horizontal line become visible. Turn the A1 back so the line disappears. Check LT supply to frame stage for open circuit safety resistor, replace frame output ic and check all electrolytic capacitors around the IC.
Give yourself a pat on back for not being fooled by the little devil and explain to your television that your more than a match fot it.

Nov 17, 2013 | GE Televison & Video

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Picture looks like its 3D what is the problem

The D52W20 had an issue with solder joints around the flyback. When you take the back off the flyback is on the very left closes to the back of the tv and has a large red wire coming out of it. Looking from the top down you will see three small orange rectangles in a row. These are fuses and one of them is going to be opened.

All you have to do is resolder the pins on the flyback and replace the fuse and you should regain convergence.

Jun 10, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Horizontal lines on picture

Can't advise on entering setup but the lines may be due to the maladjustment of the brightness control on the flyback. There will normally be two adjusters, one for focus the other for brightness. 

Nov 26, 2008 | Televison & Video

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When turn on no picture and there is a high pitch buzz or frying. Then after a minute or two it will shut off by itself. Before thid happened the picture would come on slowly with a frying sound and then...

my first instinct in this is flyback transformer. or if it is three tube projector could be a high voltage splitter lines in picture sound like what is called retrace lines ... this is another indication of a possible bad flyback. high pitch sound is another sypmpton of a high voltage flyback transformer problem. WARNING televisions generate potental lethal charge. the device called flyback is used to generate several THOSAND volts. so be carefull if you take the back of any television. along with the flyback the horizontal output transistor possible could have failed. What type of tv is it? model

Oct 01, 2008 | Televison & Video

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Lines on tv

Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback lines, frame ok. I detected two badly soldered double diode rectifiers in the secondary part of the power supply ! I checked all other joints, and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok

Nov 23, 2007 | Mitsubishi WS-65511 65" Rear Projection...

1 Answer

Brightness of picture

If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.

Aug 21, 2007 | JVC AV-27D104 27" TV

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Did you adjust the two controls on the new flyback? The top one is almost always the focus control and the bottom is the G2/screen control (brightness) If you adjust the G2 do it until the picture looks normal, too high and you will get retrace lines through the picture.

Jan 25, 2007 | RCA D32F750T 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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Picture flickers off and on

I would try adjusting the screen control on the flyback. The flyback can be easly located, find the red wire attached to the top of the picture tube & follow it down to the flyback. on the flyback you should find two controls, one screen & one focus. you sould be able to read the words above each control, only adjust the screen one. slightly increase the control till the picture stays on, if you turn it too much you will get small white lines going across the screen. Now if what i have told you fixes the set, then it is only a tempoary repair. could last days or mothes, maybe years. if it starts to happen again later the set will have to be replaced. this is a sign of the picture tube starting to get a weak. ALSO DO NOT PLAY WITH THE RED WIRE IT CARRES VERY HIGH VOLTAGES EVEN WHAN UNPLUGGED FOR DAYS.

Oct 30, 2006 | Sony FD Trinitron KD-36XS955 36" TV

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