Question about Standard (CRT) Televisions

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Dirty picture when i adjusted the picture level the image seems blotting or out of focus. The brightness of the picture became shadowy.

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Re: Dirty picture

Your problem is in focus control ckt.please check 1 focus wire going to crt base from flyback transformer is loose or foreign material deposited in crt base near that wire. 2 focus control mistuned. 3 if tv is old than crt is weak. hope this will help.

Posted on Oct 05, 2007

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Zenith pvr6069 rk is out of focus for letters and picture not very bright

First this set should have a production date on the rear of around 1995--fairly old.

If letters outlined in red etc--a convergence problem--either adjustment with remote (in menu) or a circuit problem in same area.

If picture dull and darker--locate the 3 large lens inside from the rear and wipe them clean--they are the light source for the sets picture and if dirty will cause a dark dull picture.

Let me know if questions.


Apr 22, 2012 | Standard (CRT) Televisions

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I have a tube tv. the picture as lines and is blur that goes in and out.

If the lines are colored DIAGONAL lines, they are referred to as "retrace lines," which indicates either that the picture tube bias is set too high, or the brightness level is set too high.. If the blur occurs when the image is particularly bright or a particular color is bright, it is referred to as "blooming." This is caused by either a weak high voltage circuit or because the picture tube bias is set too high.

Is the picture set very bright? Try reducing the brightness control to a level where the retrace lines disappear, and reducing the contrast control below the level where the blooming occurs.

If the television is more than ten years old or has many hours of use, the picture tube may simply be deteriorating normally. By nature, they have a limited life span. Before you decide to throw the set out, if you are technically-inclined, try adjusting the bias and screen drive controls for the television as recommended by the set manufacturer (you didn't specify what make or model the set is), and you may get a few months or years of additional life out of the set.

Jul 05, 2011 | Standard (CRT) Televisions

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Lines on the screen

If the lines are thin and spreaded allover the screen from top to bottom, and are equally spaced around one inch of so apart, it will be a screen voltage rise problem. You just decrese both brightness, contrast and colour contols of your TV to zero position, and look into, where there is lines are visible on the screen or not. You should notice this in a drak room, so as to see is well, or close all the doors and windows to make the circumstance to a little bit dark.
If you can see these lines still, it is clear evidence of the above said fault. To rectify this fault you should open your TV. Open the back cover of the TV, and you will see a Line Output Transformer. It is otherwse known as LOT. It can be recoganiized easely as it its size. Normally it will look black in colour and a thick wire from it goes the picture tube's final anode, and look like it is stcked to it with the help of a rubber ******. Other two wires from it goes to the picture tube base board. These two wires are, one for focus and the other for screen.
There will be two controls on the lot, which can be varied, and seem to be integrated with LOT. Among, upper one is for focus adjustment, and lower one is for screen adjustment. Both will be marked as "Screen" and "Focus". You just find out the screen control. With the healp of a screw driver it can be adjusted.
Keep the TV on, Brightness, Contrast and colour to minimum, adjust this control to a little [ a very little movement should be done, otherwise the picture will be get blurred], to just eliminate the lines you see on the screen. Focus control and screen controls are interactable, that is adjusting one may effect the other. After eliminating these lines just up the brightness and contrast control to at about their mid position and press the menu button on the TV or remote control to get the menu screen. Look at the letterings, and if it seem to be out of focus only, just adjust the focus contorl to get well focused captions. The adjustments are hot, that is while the TV is operating. Take care. Ok.

Oct 26, 2010 | Mitsubishi CS-40503 TV

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Jvc 27'' TV is too dark

There are two small holes on the rear side through which you can adjust focus and screen. Use a flash light and locate the two adjustable slots inside the holes. This part carries high voltage. Do not use a metal screwdriver to adjust. Put the TV facing a mirror so you can see how it works. Do not turn more than 1/8th of a turn. The focus control makes picture sharp or fuzzy. Screen control could change brightness. While watching the picture in the mirror, slightly adjust the screen control. Do not turn too much. If it doesn't work, then call a JVC authorized repair center.

Jan 22, 2010 | JVC AV-27D203 27" TV

1 Answer

JVC AV27430 picture seems to have lost the red color

Hi, good day.

Pls check for loose contacts along the crt circuit and likewise, the possibility of a defective crt socket


Feb 15, 2009 | JVC AV-27430 27" TV

1 Answer

Turns itself off

screen control. pict to bright. normal to shut down. when this happens. ****** screen control.

Nov 19, 2008 | Zenith B25A10Z 25" TV

1 Answer

Poor picture, raster & sounds ok

If the picture is fuzzy (out of focus) it may have a focus adjustment on the flyback transformer. Possibly an adjustment available from the outside, through the back. Look for any markings on the plastic housing indicating Focus, Brightness etc.. You can use a small screwdriver through the labeled holes in the case to make adjustments.
If the picture is crisp, but faint or the colors seem washed out it may be the tube is at it's end of life or needs to be rejuvenated. TV shops can rejuvenate tubes but it's not cheap.

Mar 11, 2008 | Konka K2386U 23" TV

1 Answer

Colors are distorted, brightness excessive

You may have a bad Fly Back transformer. The focus and screen(brightness) controls are located on this transformer. Some of the new RCA's have had problems with this transformer. If the screen control opens up the picture may either go dark or light which would cause your problem. Also a bad Picture tube could cause this. It shouldn't since the tv is not very old though. I've seen a few new ones go bad. Stargazer

Jan 29, 2007 | RCA 35V432T 35" TV

2 Answers

Picture - Flickers/Shimmers

I think the solution to your problem is adjustment, not of the brightness but either the `contrast' which is probably too high, or the `sharpening' if your set has this function. Too much sharpness will cause a shimmering effect, especially where you see an edge between colours.(due to ringing at a very high video frequency). Too much contrast can start to turn the video signal upside down, causing noise on the peak white in the picture. Another cause is if the RF signal into the aerial socket is too large, This can be corrected by an attenuator, costing about £2. 6dB or 10dB can be tried.

Oct 23, 2006 | Sony FD Trinitron WEGA KV-34HS420 34" TV

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