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How to change the picture tube as the colour is not coming

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It is not the fault with its picture tube. Something wrong with its chroma section circuit at its main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Dec 09, 2014

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My videocon 21" colour tv's screen colour changed to green


you problem with your picture tube.I recommed you must replace your picture tube for better view

May 05, 2014 | Televison & Video

1 Answer

My tv has a purple destorted colour


It maybe due to the disorder in the picture tube of your T.V. or it maybe the moisture in present in or on the picture tube. Try to clear out the moisture and if it dosen't work then change the picture tube.

Sep 24, 2012 | Televison & Video

1 Answer

The colour on my TV is awful, the colours are not true at all. Red looks orange, blue is glaring blue and sometimes the colours fade out a bit and then come back. I have tried adjusting everything but...


I presume this is a TV with a picture tube, and if so, it would either be the chroma decoder IC or the jungle IC which could be possible causes of untrue colour, as well as the small components around them. Electrolytic capacitors, especially those in the chroma decoder circuit, tend to change value over time. Check and replace these first before diving in and replacing ICs. If the greyscale tracking is OK, as well as the overall picture, then the tube is probably OK. If it is not, and the images appear washed out and blurry, then the tube is on its way out, which means only one thing: throw it away.

With any IC replacement, it is a good idea to invest in special IC sockets - these are available from most electronics stores for a small price (you then trim and solder the sockets to fit the board as required) this will make it easier to swap ICs in the future if necessary without further soldering.

Feb 16, 2011 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

Sony Model # KV-HA21N80 Def. Picture Tube due to redish color with retrace line. I need brand new picture tube or 2nd hand.


i have a problem with kv ha 21 m 80 t. i change the colour ic but colour are not good dot have any pre set to controll. is it controliing from the biase trassistors. green gun is not workin propaly

Jan 13, 2011 | Televison & Video

1 Answer

When I turn on my Gundig TV the sound is there, but the picture does not come for about 15 minutes. It starts off blue then slowly changes colour and eventually comes on. The TV is only 16 months old....


Hello
It may be due to the fault of its picutre tube base socket. Some of them may show this type of fault eventhough it is a new one. Picture tube base socket is located at the picture tube bas card itself. It is directly soldered to the base card, throu which the connections are going into the picture tube via its pins. You just open the tv, and pull it out [not make any shakes while pulling it, as that may bed the picture tube pins, or iven break the picture tube neck. Just pull it straight out, and refit it at the same way as you pulled it out, for two or three times. Sometimes this will retify the fault, as this process will remove any loose contact between bascard socket and picture tube pins.
If this doesn't hlep, desolder it out from the picture tube base card, go for a similar type and pin confuguation. Replacing it will solve the problem. As you replacing the base socket, look into the base card for any loose soderings are there too. OK.

Nov 08, 2010 | Grundig 21" TV

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

1 Answer

Thomson colour tube is gone


If you had mentioned that the picture tube is defective and confirmed it is a serious fault. You can rejenuvate the picture tube with a gun tester and short remover.This is not a confirmed solution but you can take a last try. Changing the picture tube is not recommendable for an old set and I would like you to go for a new Tv which will work out cheaper and gauranteed.
Hope you decide sensibly. Good day

Jul 14, 2010 | Thomson GE 27907GE1 Cordless Phone

2 Answers

The tv comes on but the picture tube has gone bad. at first if i warmed the tv up it eventually came on. the all at once the tube went out completely. i need to find a repair place where i can find an buy...


check tv screen on three colour RED /BLUE /GREEN is prasant but light or contrace is low .
if yes
then
first option is video output voltage 180v dc.canacting capaciter Replace with 10uf/250v dc
second option filament voltage 4.5v ac to up 6.5 v ac
and see pictur qulaty is improw .
theerd option is pictur tube charging 3 cathod

after change tube
see tube find this addrees
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Oct 29, 2009 | RCA F36650 36" TV

2 Answers

T.v problem with picture,too much red and no green colour


your TV's picture tube has gone ,just immediately change it.. it will be again working good.

Oct 09, 2008 | Televison & Video

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