Question about Hitachi C21-FL21F 21" TV

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Television fault My television has on a couple of occasions given me a green colour cast over the picture but after a short while has returned to the proper colour. It has now done this again but has not returned to the proper colour, does this indicate that there is a fault with one of the colour guns or could it be as simple as a dried out capacitor somewhere.

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On this set its a common thing to have an intermittant connection on the crt driver board. That would be on the socket itself or on the driver transistor. Also could be a driver problem as one of the drives comming from the video jungle IC could be bad or even in some cases could be the picture tube. Hope this helps.

Posted on Apr 11, 2006

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Posted on Jan 02, 2017

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I have a 32inches LCD tv,when I ON. it will be flashing different colour like red follow by blue and also green colour with no picture and sound.please what can be the fault?


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/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Oct 21, 2015 | 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

1 Answer

My Tatung plasma TV model no. P42hsmt when powered on shows green static no picture when changing channel screen turns to a strip of lines and returns to green spot static


If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent.

Jun 07, 2015 | Tatung Televison & Video

1 Answer

Thank you for the answer, but i got for flat tv but mine is crt tv.so is it apllicable to that crt tv also.I got LG 29 INCHES FOUR YEARS BACK, NOW IT IS GIVING A PROBLEM WHEN I ON THE TV ITS OK BUT A


Hi Babu

Check all the solder terminals at the CRT base card. If any of it get loose at the solder terminals, this kind of fault can happen. It is very difficult to detect a dry solder terminal, as it will be microscopically small. can\'t be seen by naked eye. To this type of fault, what we technicians do is, to resolder all the suspected solder terminals. In 90% of this kind of faults, get rectified by this. You too can try this. Be sure not to short circuit adjacent solder terminals to make a short circuit by any solder bridge short, when re-soldering. Electro help

Oct 28, 2014 | Televison & Video

1 Answer

I have a baird 55" LCD TV and there is sound with


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/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Sep 09, 2014 | Televison & Video

1 Answer

My tv has suddenly gone to an all pink picture. What do I do???


Possible that the green gun has failed or there is fault in the drive to the green gun or a circuit issue in the drive.
You can tap the TV and see if the colour returns, if so there is soldering issues. Check the CRT board which is behind the picture tube as due to heat the components could develop dry soldering. Solder all suspected joints, solder the chroma IC and drive.
This must solve or if the green gun does not respond the picture is a suspect and a rejenuvation is the next step.

Jul 07, 2012 | LG Televison & Video

3 Answers

I have a 4 year old WEGA Trinitron HD TV (model # KV- 30HS420) that over the last few months has been switching between full color and color missing green colorations. Most of the time now the full colour...


A good TV repair shop should be able to repair this but given the current price of flat panel TV's you might want to think about scrapping it.
I was a little confused about your description of the fault, one colour disappearing is in a very different area of fault from all colour disappearing. Does it flash into correct colour momentarily if you fine tune it? Is the picture as far as you can tell black and white or does it have a strong colour cast on it where everything is for example reddy or bluish etc?
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

Mar 01, 2011 | Sony Televison & Video

2 Answers

Same problem as many others- GREEN TV bought from Circuit city and went green about same time as extended warranty ran out. no blue left in picture green cast over all pictures any options at this date.TV...


Sony has extended the warranty on the optical block regardless of purchase date until 6/30/10. I just had them cover the repair for me. They were very good about it. Call 1-239-768-7547 in US.

Mar 21, 2010 | Sony KDS-55A2020 55" Television

1 Answer

Problem with a colour display on Hisense tv


If your picures are all purple it means that the green colour is missing. TV colour is made up by mixing Red, Green & Blue. Removing Green leaving Red & Blue makes purple. Study the green colour circuit for a fault and confirm that the green gun inside the tube is working.

Aug 31, 2009 | Hitachi 60SBX78B 60" Rear Projection...

1 Answer

Bluish green tint to television picture


Find out what board and circuit is responsible for the color and you have your answer.

Mar 12, 2017 | Panasonic PT-52LCX66 Projection Television

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