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Sony tv I need to adjust the flyback voltage to remove faint flyback lines. This resitor is nto to be found on the transformer, where can i find it or how can i trace it on the schematic diagram? thanks

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  • nightbat Apr 08, 2008

    Sorry for delay in answering, but was very busy lately to work on TV. Your guidance pointed immediately and directly to the fault! No more flyback lines... :)

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  • Master
  • 6,966 Answers

Hi again,

If your Sony KV29C5A is of the FE-1 chassis, the G2 voltage controller is in the C board. The C board is the squarish board at the very rear of the CRT. Adjustment could be made on RV701. If no amount of adjustment would make the flyback lines disappear, you need to check R722 (680K). In some instances it could also be any of R709 (330K) or R718 (33K) or R724 (470K).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Apr 03, 2008

  • 4 more comments 
  • Louie  Role
    Louie Role Apr 03, 2008

    A friendly reminder, you will be working probably on a live set and very near the high voltage section. The G2 alone carries nearly 1KV, please exercise extreme caution and safety practices/procedures when performing any of the indicated corrective measures.

  • Louie  Role
    Louie Role Apr 03, 2008

    Any luck?

  • Louie  Role
    Louie Role Apr 04, 2008

    This might be ofg additional help.

    Cheers.

  • Louie  Role
    Louie Role Apr 08, 2008

    Any development(s)>

  • Louie  Role
    Louie Role Apr 08, 2008

    Glad to be of assistance and appreciate the rating.

  • Louie  Role
    Louie Role Apr 29, 2008

    Pls don't respond. Just wondering how to remove this post/thread in "Unsolved Problems from My Askers", Tnx

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Hi, I had a problem with my Sony CRT television.


The faint background lines are vertical flyback lines. Start your diagnosis by turning the brightness and contrast controls to minimum and view the screen in a darkened room. If you can now see a raster with horizontal lines visible then it is likely that the tubes A1 screen voltage is excessive. The screen voltage is usually within the range of 400v to 600v. Adjustment for this is often part of the flyback transformer. Check all high value resistors
in the screen and focus circuitry. Some of these reistors may be
built into the flyback transformer. As the picture gets brighter the beam current increases, this will eventually cause the X ray protection circuits to trigger shuting off the set. A fault in the video drive circuits to the cathodes of the tube will cause similar symptoms but usualy results in a predominance of one colour, ie
bright red, blue or green raster with flyback lines.

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The problem is in the flyback transformer, or there is a open resistor in the video output, one possible solution is adjust the screen control on the flyback transformer a very slight tweak anti-clockwise, this in a lot of cases will fix the problem, but you must use extreme care, "high voltage danger"

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Sylvania tv srt2232s picture is dark. i have used the remote gone to pictureand still unable to adjust brightness. need your help to adjust brightness. What do i need to do to change the brightness


Hi
Remove back fron tv locate line flyback transformer
on this transformer there should be two adjustment controls very carfully adjust the bottom one, do not adjust to far as picture will have fine white lines on it

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1 Answer

Picture is very blue most times.This is a light blue, but makes viewing difficult. Also before this issue came about, you could see a faint set of arcing lines running across screen especially when screen...


You can try adjusting the Blue color output. (Very touchy and dangerous adjustment)

If you take off the front cover/speaker cover, there should be a access panel. Behind that, there should be a small rectangular black box with 6 screws on it. This is the focus block. (At least this is where most of them are located) If there is no front panel, It may be located on or near the flyback (High Voltage) transformer on your model accessible from the back instead.

It sounds like you may need less Blue in the mix. There is a screw for each color. R, G, and B. Do not mess with the focus screws, just the ones labeled 'SCREEN.' They may have silicone over them to prevent them from moving. If so, you will need to remove it and put more on when adjustment is complete.

Go to an unused input where the screen should be dark. Barely turn the blue down in a dark room so that the Blue spot is at the same level as the Red and Green.

Use an insulated screwdriver and DO NOT TOUCH the focus block and ESPECIALLY NOT the back of it.
Very HIGH VOLTAGE. I found that out the hard way.

Do not turn any of these up too high or damage may occur to the tubes. If you turn them up too much, the TV may detect a short and shut off. this is a normal fail safe. These only need VERY slight adjustments.

I have found that if the three colors are adjusted in a dark room to where the 3 color spots (R/G/B) are just barely visible on the screen at equal levels, there is a pretty good color balance.

I hope this helps! Just be careful. Once again - LETHAL HIGH VOLTAGES ARE PRESENT WHEN UNIT IS ON!!!!!!

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1 Answer

My tv wont turn on the light on the power button blinks and the lamp turns on in the back but the screen dont light up


check if crt screen voltage correct (g2) try to adjust screen settings at flyback transformer and monitor if g2 response, some model if vertical ckt down monitor have black signal only can determine if screen adjustment knob in flyback transformer turn increase. vertical line appear.

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1 Answer

My tv is blurry. how do i get it to clear up? I


CRT tv's have a FOCUS adjustment on the flyback transformer. There may also be a "screen" adjustment on it, but you DO NOT want to turn that one.

You would have to open the tv, and take an INSULATED TOOL and turn the little adjustment labeled FOCUS or F on the flyback transformer, which is the large (usually black) thing that makes the high voltage for the CRT. It can easily be found by tracing the large red wire that has a suction cup at the top of the tube in the back. This wire goes to the top of the flyback. the focus is usually on the side of the flyback.

IMPORTANT!!!!

You must be very careful when doing this. Use a mirror to see the front of the screen while adjusting, don't reach around! Since this is the part of the TV that has LETHAL voltages you must be VERY careful not to touch anything else, since this must be done with te set turned on and warmed up.

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1 Answer

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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

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1 Answer

Visible scan lines


Hi,

Two possible reasons/solutions why:
1. one or more of your color drive transistors is/are faulty. These are the 3 transistors normally heatsinked in a separate squarish PCB connected at the rear end of the picture tube (CRT). If one or more is shorted, open is leak, then the video display would have faint re-trace lines. other indicators include too bright, unusual color;
2. the screen voltage from the flyback transformer (FBT) is a bit high. This is adjustable and the control is normally at the FBT itself (towards the rear). There is another control present for the focus.

Of course the usual safety precautions applying when working with live sets or electronics with high voltage and possible residual power (in the capacitors).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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