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Tv not working

My tv colour is going blue

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First thing to do is to resolder the crt board basically, its always just a simple loose connected component.but u need a prof serviceman to do that..hope this help..thanks

Posted on Feb 08, 2008

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If the screen is totally blue(ie no picture information) it sounds as if it's time for a new pix tube or a new set..sorry...accordianman

Posted on Feb 07, 2008

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Posted on Jan 02, 2017

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1 Answer

What are signs of picture tube going?


Signs of a CRT going old, are bad focussing, unnatural colours and hues of a certain colour (red, green, or blue) if you watch black/white pictures. In colour pictures, black sequences also show hue.

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Sony kv-EF29M80 blue colour missing and takes time to turn on unlike how it was before. the images are blur.what could be the problem and what solution is there for it?


Check the collector voltage of blue output transistor at its video output board, which can be located directly plugged onto the neck of the picture tube. Check for any loose solder terminals at this board.

Dec 04, 2012 | Sony KV-32FX60 TV

1 Answer

No green and yellow colour


Hello
If you see the picture in yellow colour, means that there is no blue colour output from the video drive section in your tv, Yello is the mixtrure colour of red and green. Green is actualy there. blue colour is absent.
To detect this fault, you must open your tv. Just look in to the video output section, can be located at the picture tube base card, which is plughed into it diretly. See for any loose soldering points there. Check whether transisotors are used for red, green and blue output stages, or an Ic or three seperate Ics are used for this purpose. Anyway, blue catode of your picture tube pin gets a hig voltage, and so the blue emission is absent. You just check the voltages at red,gree and blue catodes, at the respective picture tube pins, which can be taken at picture tube base card. All of these three pin voltages must be somewhat equal to each other. In your case, no voltage at blue cathode will be higher that the other two. Check for the reason. It may be due to an open video output transistor [blue], or an Ic, of one Ic if used for the three colour outputs. Check and replace the same, will rectify your problem. Ok
If you have andy difficulty, get it to me through Fixya. Ok
Gopakumar, India.

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1 Answer

My sony tv KV-19BMR1 color is my problem more blue?


Hello

Advance of any one colour, Red-Green or Blue, will be due to the some fault in the video output section in your Sony TV. When the related colour cathode of the picture tube gest improper voltages, say low voltage than normal it should get, then occures this problem. As you know, all colour TVs have three electron guns, otherwise called as cathodes, are there inside the neck of the picture tube. One emits blue, an other emits green and an other emits red. You are seeing the combinations of these three colours displayed in different ratios in your picture tube when a picture is being viewed. Keep this in mind and follow please.
All the above said three cathodes of the picture tube has some voltages applied to it to emit predetermined quantity of electrons from them, which determines the intensity of that colour. Now your TV displays blue in excess means, the blue cathode of the picture tube in your tv has a low voltage with respect to the other two have. Cathodes are negatively biased, that is as its voltage goes low it will emit more and more electrons, which will cause an abnormal excess colour of that cathode.
You just open your TVs back cover, without damaging any other components inside, after unplughint it from power wall socket. As you open the back cover, you will be first exposed to a small rectangular board, plunged into the neck of the picture tube, known as base card. It is pluged into it with the help of a socket, we call it as picture tube base socket, and it can be pluge out from it by applying a gentle pull backwards. Never make a right or left shake when you do this as it may damage the picture tubes pins or even break it.
Give power to the TV and keep switched it on and see the screen. Keep the colour control to zero position, and brightness to at about 30%, and contrast to 50%. At this condition, you shuld get a clear blacke and white picture. In your case now, you only get a picture with a blue shade. Locate the "blue cutoff control' if any fitted on the base card, [as latest sets have not], and it will be marked as "b-cut" usually. If it is there, with help of a plastic screw driver rate it just a little counter clokwise or clockwise, while observeing the picture, whethere it gets any change in colour or not. If there is no colour change, the colour output transistor related to blue cathode should me changed. It may be leaky.
If there is no color cut-off control is seen, you won't have this option. If so check the voltages of the three above said cathodes, and it can be taken with a multimeter set to 400VDC or above. it should be almost equal th each other, except a voltage difference of 3 to 4vDC is allowable. In your case the blue voltage will be more less than thi tolerence. You can take this voltage by touching the meter probe to pin number "3"_blue, pin number "4'_green and pin number "6"_red. Usually sont tubes have this kind of pin cofugurations. If the blue cathode voltage is seen abnormal with respect to the other two, replace video output transistor related to it. Thsi transistor also can be located in the base card describe earlier. Ok
If you have any doubts and difficulty, inform to Fixya, and they will gvie me alerts.
Keep every precations before opening the back cover. Keep children away from you and never allow them even stand beside you. Let an adult to be beside you while you do this work. Keep the TV pluged out from the wall power socket every time before you touch any of its inside components.
Be confident and patience. If you have some knowledge in electronics, you can do it by yoursef. If not, go for an experienced service personal. I thinks tha you yoursef will do and you can. Ok

Oct 22, 2010 | Sony Televison & Video

2 Answers

Colour problems on TV


try to disgusting it and next time don't near it the magnet or speaker

Sep 25, 2009 | Televison & Video

1 Answer

I have a 32" sonya tv about 10 years old.... Have no red color any more.. Where can I get this fix and would it just be cheaper to go get a new tv.


tv producess three colours red, blue and green, each of this has a different input on the tube (crt)
each has a seperate path from the IC to the tube neck.
on the tube are three transistors, each one for one colour,these transistor can be tested individualy,
if all this does not work, then take your tv for rejuvanation (opening of gates on the tube in puts)

Apr 30, 2009 | Sanyo Televison & Video

1 Answer

Bush RFT TV


The picture tube of the tv has 3 color in CRT Red, Green, Blue. The red cathodeof tv set has no function, its either the resistor become higt resistance, that why u need a repairman to replace it.

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1 Answer

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Was the tv dropped?--try manual de-gaussing.If that does not

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1 Answer

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1 Answer

Help


Not a home repair take it to a repair store.

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