Question about Thomson 21DC320 21" TV

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Red colour on screen

I have thompson 21 inches quadra Tv. red colour is apppear on tv while seeing movie. speech, sound, picture is ok. what will be cause <

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If crt pic tube magnitized need to degausse with coil

Posted on Jun 01, 2010

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6ya6ya
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Posted on Jan 02, 2017

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What do you think is wrong with my television, it has sound but no picture. How can I fix the problem?


Hi there
I would go to menu on the remote , from there to picture go down the list, if you do not find anything there to help you. Go to Support and to the E manual .
26053790-x3zeawgeewbvgdzeyuixqaom-4-0.jpeg Kolbrun

Jan 14, 2016 | Samsung LN52C530 52" LCD 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

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Lg ultra slim 21 tv sound picture power


ok ur tv powersupply is ok but horizantal is not working chk ur fbt hot & micronass

Mar 21, 2014 | Televison & Video

1 Answer

Sony kvj21mf1ak


It sounds like either the TV or the device is trying to do S video instead of composite video.
see if you can change the output type of the media player and make sure that the TV input is not set to S Video.

Nov 19, 2013 | Cell Phones

1 Answer

Red colour appearing on screen


Your tv could have one of several faults. None of which are to be tackled by anyone except a qualified engineer due to the electric shock hazard.the first problem could be the crt (tube) the second could be the componets on crt base circuit board ie resistors or ic.
With a tv 9 years old it may not be economical to carry out a reair.

Jun 01, 2010 | Thomson 21DC320 21" TV

2 Answers

Sound is not coming but picture is ok in philips 21 RF vardan tv


sound is not coming but picture is ok in philips 21 RF vardan tv

Dec 16, 2009 | Philips 32PW6506 32" TV

1 Answer

Colours missing from tv


There are three color guns in a TV that make up the picture. Red, Green & Blue. It sounds like you have lost the green color gun.

You can get it rpeaired again, but your TV sounds like it is ready for TV heaven.

Jul 25, 2009 | RCA 20F512T 20" TV

3 Answers

THOMSON - QUADRA 21''(21MT62IN)


were you able to get the problem solved Even I have the same problem

Sep 08, 2008 | Thomson 21DC320 21" TV

1 Answer

Hitachi 32LD6600 - When the TV has been on for abot 30 minutes the colours start to go blue/red and the picture is distorted,noting I do gets the picture to display as normal.


Hi i have this tv and last night the screen went black i can hear sound ok but no picture just a black screen, Also i can see dark
outlines /shadows of whats on the tv, can you tell me please what has caused this

Mar 05, 2008 | Hitachi 26LD6600 26 in. HD-Ready LCD...

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