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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Re: television fault

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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Check its video output card for any loose solder terminals. This card can be located at the neck of the picture tube, will directly plugged on to it. The is a common fault found to most of the Sony CRT TVs. Re-solder all the suspected loose solder terminals, by applying a little more solder, without making any solder bridge short circuit in between adjacent close solder terminals. In most cases, this must solve the problem. To get some details, up older posts.

Dec 05, 2013 | Sony KV-27S42 27" TV

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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 Standard (CRT) Televisions

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The picture is blue on every channel, but still has sound and picture

Hope is might help , if the others colours red and green are showing on the screen then resetting the grey scale as per service manual might clear the problem , but if one colour is missing then voltage cheek,s of the cathode voltage on the tube might give a clue to the fault a possibity might be a fault in the tube. regards Derrick.

Jan 30, 2011 | JVC Standard (CRT) Televisions

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No green and yellow colour

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.

Nov 21, 2010 | JVC AV-27230 27" TV

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I have seen a problem in my tv is that there is no green colour display in crt. only two colour ( i.e. Red and Blue) or combination may be display. Pl. look into this matter , replay soon

Your problem may related to the green output or driver stage in your tv. Usually green calour is not tranmitted, only blue and red colour informatein are comming from transmitters. Green colour information is regenerated inside the tv by matrix network. If the matrix get damaged no green colour will be displayed. To check first; whether the TV colour picture tube's green gun is right or not. For that you must connect a resistor of value more than 470k 2W, to the green cathode of the picture tube base to earth. The connection should be done causiously, not for a long time. It is advised to do in intermittantly with just touches. When you touch the green cathode with the resistor with one side of it earthed, a green flash must come on the crt. You can do this test for red and blue too. If there is no green flash, or light picture tube may be faulty. It is a very rare case. You must check the volltages of the other two cathodes [red and blue]. The voltage at green cathode must be almost the same as other two.
Just check the green output transistor for open. If it is open, voltage at green cathode will be high. Also check the base voltge of the green output transistor. It should be around 2.5vDC. You can compare the base voltages of the other two transistors with green drive base voltage. If there is no base voltage, the fault should be in the matrix section. It is inside an Ic. Philips usually uses TDA series Ics in chroma section. Check the Ic pin voltages according to service manual and try to rectify the fault. It needs a technical knowledge and skill.

Oct 14, 2010 | Philips Magnavox 27MS343S 27" TV

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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

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Color Problems: No Green

Because the fault is intermittant this can be a cold solder connection anywhere along the video path of the green drive output at the colour demodulator through the various stages up to the CRT socket. It is also possible that there is a failure occuring in the bias supply that works for the green electron-gun in the CRT in the case of a CRT type set. It is also possible that there is an intermittant component along the green video path. On rare occasions the CRT itself can have an intermittant fault.

This would have to be serviced by an experienced tech. You can take the set in for an estimate to see if it is worth servicing.

Jerry G.

Apr 14, 2008 | Panasonic CT-32SL13 32" TV

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Pink colour

Hi there!
May be that the colour Amp is at fault or the tube is busy failing. Commonly it would be the colour Amp (Dry joints or faulty drivers). The Green is dead. I have had cases where power surge can magnetise the tube to such an extend that the whole picture will show one colour. In your case I doubt it very much. Good Luck,JUS004

Feb 26, 2008 | Bush WS6671 28" TV

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RCA tv only in black and white?

The route through the circuits in the TV from the various sources all lead to the final video amplifiers for red green and blue. Somewhere along the route is a circuit called a colour switch. This allows colour if the signal is strong enough, otherwise it only allows black and white. This fault suggests a weak video chip which is the one just before the switch circuit. the fault could also be a faulty coupling capacitor to or from this chip, or a low power supply voltage. Check for dry soldered joints around this circiut. Please note if resoldering on new televisions that they may have non leaded solder which requires about 50 degrees centigrade hotter iron.

Oct 15, 2006 | RCA F27628 27" TV

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