Question about Standard (CRT) Televisions

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The Tv just got a green ring around the edge of the picture

We moved the sony tv which is about 5 years old up stairs and now it has a green ring of color around the screen. Can I fix that. Its not that old,

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If this is a TV with a CRT (glass tube screen) then this pattern will be caused by a residual magnetic field in the shadow mask (the metal bit at the front behind the glass). Normally when a TV is turned on from cold a set of wire coils demagnetize (or degauss) the set and clear these patterns. If this circuit is not working you will have to take it to a repairman and get him to do it manually (or the shadow mask in twisted). In future handle the set with care and keep it away from strong magnetic fields (vacuum cleaner motors, etc).

Posted on Dec 21, 2008

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24" Panasonic Tau... about 9


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The tv is at least 17 years old.The blinking red light blinks 5 times ,then the tv picture goes off . The voice is still on


Five blinks is the error code for an AKB (auto kine bias) error. What this means is that the set isn't able to balance the three color guns (red, green and blue) of the picture tube properly, and it's blanking out the screen.

To get the proper colors, the signals for the three colors need to be balanced, and Sony sets have circuitry to do this automatically. Other brands don't, and when they go out of balance you see a picture that starts to show tinting or colors that are off. As the picture tube ages, it gets harder to adjust the balance until finally the AKB circuit can't anymore, and poof, the picture goes away. With a 17-year-old tube, it's not surprising.

There isn't anything that can be done to fix the picture tube, it would need to be replaced. But the cost of the tube and the work required to get it set up after installation makes it completely uneconomical to repair this TV. A new picture tube is nearly $200. Then special tools are required to set the tube up (a process called convergence), so you'd need to find someone to put it in, and possibly pay to have the old one disposed of. A new 32-inch LCD set is around $350 now. Treat yourself to a new one.

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1 Answer

I have a sony wega and the picyure is clear but has a green tint what could that be


There are several possibilities in that area. The Picture Tube (CRT) is driven by three different video signals. One presents the Red, one the Blue and one Green. All other colors are derived from a mixture of those three colors. The greenish tint could be a sign that the green gun is being over driven or the Red and the Blue are less than adequate to create a normal picture. Sorry to say this but the most common problem that causes that symptom is the emission in the "gun" assembly inside the picture tube is declining with age and hours of operation. Sony Picture tubes are typically good for around 40,000 hours of use. I don't recommend replacing the picture tube. If the set is more than 5 years old I would suggest that you start looking for a new set.

I know this is bad news but I am just telling what I know the most likely scenario that I have seen in 35 years of TV service.

Zashiban

May 29, 2010 | Sony Standard (CRT) Televisions

1 Answer

The picture has a green tint to it on all channels


The color signal consists of Red, Green and Blue. Those three colors, at various degrees, make all the other colors on your screen.

If you have a BRIGHT green screen it's best you don't operate your set.
If it's just tinted green then there is a problem on the CRT (Cathode Ray Tube) drive board. Do check your "tint" setting and see if someone misadjusted it. If that isn't it then you need to have your set on an electronics bench and get an estimate for repair.

Apr 17, 2010 | Sony FD Trinitron WEGA KV-27FS100 27" TV

1 Answer

Our Trinitron KV-36XBR400 powers up then no picture


How old is this tv?More than 5 years old.Not worth it to repair CRT tv at this prices.Tries unplug,replug an hour later,might help,see if reset itself.U can buy a pretty good 32" LCD tv at $400 or less these day.It not heavy as the CRT tv,it alot easier to move the tv around the house or other locations.

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I bought a 3 year old Sony FD Trinitron WEGA KV SW29M50 29 and it did not come with a manual question thereare 5 jacks above the video jacks what are they for i have surround sound speakers how do...


The inputs you refer to should be colored as follows.
Red
Blue
Green
Red
White
(not necessarily in this order)
These are what are called Component Video inputs and is one of the way that HD capable equipment connect to your television. It will not get true HD picture but this input will provide you with a crisper clearer picture.

Good Luck and Happy New Year.....

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2 Answers

Sony Trinitron TV now taking around 5 minutes for picture to appear (sound comes on instantly) Is it worth repair or should I cut losses and replace set?


How old is the TV?
Sony Trinitron sounds like it may be from the 1980's?
Some TV engineers can use a piece of equipment to do a "tube boost" but this is sometimes risky and can completely ruin the tube, but it's a risk you would have to take.
If the TV is over 15 years old, and has been used regularly, (like 4 hours every day or more) it seems likely that the tube has reached the end of life.
TV cathode ray tubes are like light bulbs...they do not last forever!

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1 Answer

Green screen and distorted picture sound is good but no picture


It must be connected with the color circuit of your tv, a board connected to back end of the tube. Could be dust, cob web or carbon deposit shorting a transistor. Popping noise if loud enough can be attributed to high voltage circuit fault and picture tube.

Have it service by a qualified person.


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Since it is 5 years old mostly dry soldered appears. First sort out the soldered problem. Then check zener diode in video input path is short. Mostly the diode is short. Still get problem check video switching ic also. I think former is the most problem.

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