Question about RCA 20V500T 20" TV

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Green Screen When I turn on the TV the screen is green. I have chechcked the voltages at the small card that plugs in the neck of the tube and they are okay! I trace the RGB points back ti a chip in the mother board. The information on this is as follows:TCL-A28V02-T08852CRNESPU4 Tv model is RCA 20V500T Do you thinks this chip is bad?

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  • Jage Jan 19, 2008

    Just received this T.V. from a friend.... The screen is green. I have tried to adjust for color using the "menu".... I have MUCH better "everything" now; but the screen is still green. I know NOTHING about the "guts" of a T.V. Help. please?

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REPLACE R 510 18 K RESISTOR ,

Posted on Aug 08, 2008

  • JERICOS Aug 08, 2008

    REPLACE R 510 ON CRT BOARD....18K OHM......

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Did you check the voltage output of three transistors going to the crt pin of picture tube? it should be somewhere in 150V to 160V, they should have the same voltage. Try resolder all transistor and its component or repace the transistor from the green section of crt board

Posted on Jan 19, 2008

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Screeen color is green


This fault is called one color predominant screen. The cause might be to its video output card itself. There will be some loose solder terminals around the Green video output transistor. Check this card for any loose solder terminals. Just re-solder all the suspected solder terminals by applying a little more solder, without making any solder bridge short in between adjacent solder terminals. This card can be located at the neck of the picture tube [a rectangular board], will be directly plugged on to the back of the picture tube.

Dec 27, 2012 | Curtis-Mathis CM27101S TV

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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

1 Answer

I have a Panasonic TV CT-34WX50 every time I change channels


it sounds that have problem in the chroma board ( video board ) a small board that hooked up in the neck of the picture tube. if the color is greenish the cause is dead in red video driver transistor or open resistance. hope this can help good luck.

Jul 26, 2012 | Panasonic CT-34WX50 34" TV

1 Answer

Screen went green on sony tv


Check the video output section circuit for any loose soldering or component failure. Check the voltage at the green cathode of the picture tube. Can be measured by using a multimeter. At present, this voltage will be lower than other tow cathode voltages. In most cases, the cause for this fault is found to be with loose solder terminals itself.
Check all the solder terminals at the video output stage printed circuit board. You can locate this board at the picture tube base itself. Will be plugged to the back of the picture tube neck. A rectangular board. Normally, it will be very difficult to detect loose solder points, as they might be microscopically small to detect by ***** eye. So it is recommended to re solder all the suspected solder terminals there, by applying little more fresh solder, without making any solder bridge short in between adjacent solder terminals. This must solve the problem you faces with your TV

Jul 23, 2012 | Sony FD Trinitron WEGA KV-34HS510 34" TV

1 Answer

Screen turns green The picture and sound are fine when I turn on the tv. After about thirty seconds the screen turns green and then turns off and the power light blinks.


Sad to say, but that's one of the ways a picture tube can behave when it's gone bad. After it warms up, one of the wire elements in the neck of tube sags and touches something it shouldn't. As a result you're seeing the green screen, and then the set shuts down for safety because of voltage feeding back. The only way to repair the set would be with a new tube, and that's completely uneconomical. You can buy a new 32-inch LCD set now for less than the price of a new tube, not including the labor to install the replacement and get the color alignment (convergence) set up.

Mar 08, 2011 | JVC AV-32F704 32" TV

1 Answer

Friend gave us a toshiba a3642 tv,the screen is green,is this worth fixing?


Hello

Your TV is has no green cathode voltage at the picture tube pin. There are three electron guns for every colur picture tubes, Red, Blue and Green. These three guns together mixes all colours we see on the screen. If any one of them happen to be not working properly, that colour must either be lack, of excess. Voltages at the above said three colour cathodes are somewhat equal to each other. if voltage goes down, the emission of that particular cathode will rise, and as a result that colour will be predominent on the screen.
These cathodes are fed voltages from the video output stage of your Tv. This stage can be located at the neck of the picture tube itself, as a card pluged onto it, called the base card. There will be either three trasistors to drive the each above said three cathodes, in some sets, there will be independent three ICs or only one IC capabale of driving these three catodes will be used.
You just open your TV, after unpluging it from the wall power socket. You can locate the above said base card, at the neck of the picture tube. Before doing anything, check very keenly for any loose solderings are there on the CRT base board. It is very difficult to locate the loose solderings, as they may be microscopic in size. So I advice you to resolder all the soldering points on that board, by applying a little more solder, without making any short circuit bridges in between.
In most cases. this will solve the problem. If not, check the voltages at the above said three cathode, wheere tey were marked on the PCB itsef as R ,G & B. You can see that the green cathode voltage of your set will be much lower than the other tow, in your TVs case. If so, check the resistor connected to the revalent Ic or transistor, whichever it may be, for open circuit. that is check whether it has burned or not. If that resistor is Ok, replace the transistor or IC, which drive the green cathode.
If you wants furthermore assistance, feel free to get me through Fixya. OK.

Dec 15, 2010 | Toshiba 36A42 36" TV

1 Answer

I have a Samsung CT5038VC CRT TV, it was showing very well , then suddenly, the entire screen went green! you can still see, but everything is green. Please assist me in finding the solution to this...


Hello

Since picture is there, sound also mut be. The screen colour went green is your complaint. It is due to the video output stage of your TV. The fault mainly occur in the picture tube base board card. Loose or bad solderings ara always noted. There are three video output trnsistors there in the base board In some models of Samsung sets, either three individual Ics or one single Ic is used. Anyway the fault lies around this card.
You jsut open your TV, pull out the base card from the picture tube neck, care must be taken when you do, not to shake sideways or up down. Just pull it straight back, otherwise picture tube base pins or picture tube neck wiil get damaged. Before doing this check the vlotages of the three cathode pins of picture tube base. It can be done withoug detaching it out from the neck. There are three cathodes. Blue, Green and Red. In most Tvs these voltage will come near to 130 vdc or so. In your TVs case, now the green cathode voltage will be low with respect to the other two cathodes.
This may be due to a loose soldering or fault related to green cathode itsef. If transistors are used, check the green output transistors collector voltage,and compare it with the other two voltages. If Ics are used, do the same. If one Ic is used the checkings are the same.
Just resolder all the loose suspected points before replacing anything first. If it does't help, you just desolder out the green bias drive, whether it is a transitor, or Ic, whatever may be. If it is transitor, just plug it to the picturetube and switch it on without the green drive. Now you must see a different colour, a mingle of red and blue, a type of cyan. If so you can make sure that green output, whatever type it may be, is faulty. Just replace it with same type and number. Check the 2W resistors, if any used, for open, especially to the green drive transistor load resistor. Ok.

Nov 13, 2010 | Samsung Televison & Video

2 Answers

Tv screen shows green/pink


Ur video board that connected to the CRT long neck(tv tube).Have burn,capacitors?Or cold solder socket pins connected to the crt tube,must resolder,might solved prob.

Oct 14, 2009 | Televison & Video

2 Answers

Black pic on tv turns green


normally this means the high voltage preamp green control transistor on the neck of the tube circuit board is loose solder connection from heat or is going bad.

Feb 17, 2008 | Sanyo HT32744 32" TV

1 Answer

Green Screen


Your picture tube is bad,pull back off/ unplug crt broad on neck of tube make sure it does not touch anything ,turn set back on if set stays on tube is shorted!

Dec 18, 2007 | GE 13R100T 13" TV

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