T.v problem with picture,too much red and no green colour
Please can you help..... t.v is 8 years old,still has picture but there is too much red colour present and no green colour....has the crt gone and would it be worth trying to repair it,and at what cost.............cheers firstname.lastname@example.org
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Re: t.v problem with picture,too much red and no green...
Without knowing the model number, there is little detailed information I can provide. It is unlikely for the picture tube to cause this (although it is possible). Most likely one of the CRT driver transistors has failed. Please post the make and model and I'll provide more details and possible solutions.
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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.
there should be 5 or 6 preset on the crt(tube) base 3 of them should adjust red /green blue in the white aera and the other 3 adjust re/ green /blue in the dark aera make these adjustment with the colour turned off.
Sad to say that this is most likley a low crt the blue gun as gone low.
One of two things, if you have a lot of use on the set or if it's on every day for a long period of time you probably have a worn out picture tube. If this is the case it would far exceed the price of a new set to repair, if a picture tube could even be found for it. The other thing could be open transistors on the CRT circuit board. Based on it's age, it's probably not worth repairing unless it's a very large set 32" or 36" .
Convergence amp ic bad http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html http://www.hdtvoice.com/voice/showthread.php?t=28929 Or send to ptscorp.com
Unfortunately this model has a bad CRT. If is 3-4 years old and the greenish picture is in all inputs, for sure the picture tube is gone. If the picture is green only in component input check the connections for the blue and red cables.
this symptom is characterised by the loss of one or two primary colours. this symptom can be classified into three cases: 1) loss of red colour, 2) loss of colour blue,3) loss of green color. this symptom may be caused by a trouble in the colour demodulator, in the color amplifier or in the colour subtraction amplifier circuit. in your case loss of blue colour. this is a very complicated problem that you need some special test equipment like oscilloscope and color pattern generator in order to trace the signal. tune the receiver to a color broadcast station(a colour bar generator can be used to transmit a colour signal to the set). check the Z-axis demodulator, z-axis amplifier and the B-Y output circuit for the chroma signal. observe the signal process with an oscilloscope. if the color signal is not present use a VOM to locate the defective component in any of the above circuits. check the transistors and the resistors in the collector circuit. good luck!
With the set being 12 years old, I'm sure the picture tube is near the end of its useful life. You probably have a defective semiconductor, either an IC or transistor that has gone up giving you no color, but with the green picture, it is not likely worth repair.