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The green gun on my set flickers. i get a clear picture without the green, although very red and blue. do i just have to replace the green gun?

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  • jnsd Jul 25, 2008

    57F500A

  • jnsd Jul 25, 2008

    thank you should a tv repair service be able to fix this easily

  • jnsd Jul 25, 2008

    what is the part number and where can I get it?

  • 6slimshady9 Jul 29, 2008

    I have a Hitachi 46F510. When I turn the set on, the screen is blue and you can faintly see a picture, then it shuts itself off anywhere from 30 seconds to a minute after.



    I opened it up and turned it on and the green gun is not lit but the blue and red ones are.



    I have read the posts on here and haven't quite found the exact problem i am having.



    Do you have any suggestions?



    Thanks,

    Lee

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  • Master
  • 8,617 Answers

Whats the model number of your set? Please respond to this same post when replying

Posted on Jul 24, 2008

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  • Sonny Berry
    Sonny Berry Jul 25, 2008

    Hitachi are not known for bad CRT (tubes or Guns) it may quite possibly be the Green CRT drive board that is attached to the green gun, as usually if the green Gun is bad it will shutdown a hitachi. I believe the problem is within that drive circuit and they are very inexspensive boards to replace.

  • Sonny Berry
    Sonny Berry Jul 25, 2008

    As long as you get an honest one, as most may want to say the Tube is bad because they know its an exspensive part, alot of shops are not very honest sad to say. You may want to consider ordering the board and installing it your self as its very easy to replace depending on what a shop tells you for an estimate.

  • Sonny Berry
    Sonny Berry Jul 25, 2008

    I am not seeing a part number for it. But it should be stamped on the Board itself.

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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 Televison & Video

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SONY TRINITRON ONE COLOUR PREDOMINANT SCREEN


Sony Trinitron sets are of CRT [Caothde Ray Tube] types. The common fault seen in these type of TVs are any one colour predominant on screen wih sound OK. Either red, blue or green colour with some thin horizontal lines at about an inch apart will be seen on the entire screen. This is totally a display card problem, which can be seen pluged onto the picutre tube neck. There are three electron guns for every picture tube, which emits red, blue, and green beams, which in turn illuminates the phosphor on the screen to get that colour. If no emission from all guns, results in a blank screen, ie black screen without any disply at all. The three colour beams together produces proper coloured picture what we see on screen. These three gun's terminals are brought out by pins of the picture tube outside to which video signals are given in appropriate proportion to produce a TV picture. Normally, all these three pins are biased with a voltage of about 170 to160VDC+ve. Take one colour gun, as an example and and let me describe the problem.
Let it be a green gun. These guns are called cathodes of the picture tube. If it gets a voltage with respect to its grid, it will emit electrons according to the voltage applied to it. This is a negative process, that is, as the voltage at this pin drops, its emisson incresses and vice versa. If the emission increase, the colour with respect to that gun also will increase and gets predominant at the screen. So when we see a green predominant screen, there will be less voltage at the green cathode with resepect to the other two. If red colour is predominant, the voltage at red cathode will be less than the other two. If blue colour is predominat, the voltage at the blue cathode will be less than the other two.
We must find out the reason for this fault first. Assume that your Tv has a red predominant screen with some thin lines across it, at about one inch apart of the entire screen, it is clear that the the red cathode voltage is very lower than the other two. the main reason for this fault, normally seen in most of the Sony Trinitron, are loose soldering points either to the picture tube base socket or the resistor connected between the red drive transistor's collector point. Resoldering the most of these points on the base card by applying a little more solder will rectify this probelm. Other possibility is shorted video output transistor of that cathode. A direct short [collector to emitter] of these transistors will drop volatge to very low at that respective cathode of the picture tube, and that colour will be pridominant along with lines. Replacing the transistor will solve the problem. In some cases, the resistor connected to that transistor may have blown out. If so, it should alo be replaced. Whatever the case may be, voltage at the respective cathode that emits colour will be very low with respect to the other two. Find out the reason and rectify it. You can compare the voltages of the other two cathodes with respect to the faulty colur cathode. Cathode pins will be marked on the base card, and can be identified. It is best to pull out the base card from the picture tube neck and place it somewhere a safe place without shorting it with other parts of the TV. You can measure the voltages of these points very easly, without fearing the damge to the picture tube. After all are found Ok, replug the base card and switch on the TV. The set will be alright. In rare cases, chroma IC also can be a reason for this fault. if it is faulty, after a short period after switch on the TV, the IC will overheat and shutdown the entire system.

on Mar 21, 2011 | Televison & Video

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On a projection television you will have to replace all three(red,blue,green) projection guns in a matched set, the reason is if you replace just the green gun, your picture will be over saturated with green light making your picture look green,because the new gun will be alot brighter than the red and blue guns.
With that said, repair will cost approx.$400+, I've heard up to$600. Good luck !

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1 Answer

Samsung SP47W3HFX tv blue flickering curved line..


If the lines are slightly curved and stationary on about 2/3 of the screen its either the Blue CRT or the Blue CRT drive board which is having the problem.

Dec 19, 2009 | Televison & Video

1 Answer

Color is bad especially colors like orange and the white on peoples teeth is black most of the time andthe picture is not clear


HI, thank you for visit fixya.
Common problem on this set .
Picture tube liquid is dirty.
Mostly in crt green and crt blue.
Do you have electronics skills?. If so, open the TV ( back cover), you will see green,blue and red gun. After turn on your tv, select any channel or video signal, cover with piece a paper two guns at the top ( any), and see how look the picture in the front, try one at time, ( press menu on remote control and see leters-clear). I am sure the green and blue will be no clear. all the time red tube is fine.
REPLACE COOLANT LIQUID PROJECTION ( solution).
I will be here for any quetions.
Thank you

Dec 01, 2009 | Philips 60PP9352 60" Rear Projection...

2 Answers

No Red color at all. The convergence feature does not work either. Lots of green and blue RCA Model D52W59


Red color gun has failed, which will make the picture over saturated with the other two colors(blue,green) the bad news is the three color guns need to be replace in a set(all at the same time) because if you only replace the red it will over saturate the older blue, green guns then your picture will be mostly red.Unfortunently in most cases it's not worth the investment, better off to purchase a new tv. Good luck !

Nov 28, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Green picture only


The projection TV has 3 guns RED GREEN BLUE. In your case the red and the blue guns are gone. So you are getting the green color screen. You got to replace the picture tube.


Jul 25, 2009 | RCA TruFlat 27F520T 27" TV

1 Answer

17 yr. old 35" RCA loses color intermittently. Picture & sound ok


Three guns Red Blue and Green in the picture tube of an old CRT set. If one of the guns goes out it effects that color. Sounds like one of the guns inside of the tube is going out, To costly to replace for such an old antilog set that will have to have a convertor box next month anyway.

Jan 12, 2009 | RCA 15L500TD 15 in. TV/DVD Combo

1 Answer

Dominant blue


Can you post to the party who has too much green how to adjust the video adjustments? They need to know so they can see if
its just a simple adjustment.
In your case, first turn the color level clear down to where you
have a black and white picture. As in the case of too much green,
question is if the picture is black and white or if there is a color
on the screen so its blue and white? I suspect it will be which
is typical when the guns start to fail. Likely the green and red
guns are weak in output. There are screen adjustments in the set that a tech can set up that may help some, but the only real fix is to replace the guns which is expensive and requires a complete allignment. All 3 guns need changing to get it back to spec and it is a good idea to replace the flyback for reliability. Get an estimate and likely you can replace the set for the same money.

Jul 26, 2008 | Mitsubishi CS-27205 TV

1 Answer

Green picture


you might wanna look into the "flicker issue" with your set...If you've had it for a while a could be that it's just worsened over time and developed into a voltage leak. I have the same set and it went undetected for a couple of years due to poor quality cable signal..once I went to a clear signal (ie. directv) the issue was very noticeable, but by that time it had progressed. Eventually one of your guns will fail and the set will stop working all together (mine did just under 4yrs from purchase) and unless you have Sears warranty that WILL try to stick it to you. TRUST ME!!! Good luck.

Apr 01, 2007 | Sony KP-57WS500 57" Rear Projection...

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