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It might be due to picture tube problem... As its too old, the picture tube might be weak and hence you might get colors at the edges.. Better replace the picture tube with a new one to solve this problem
Tv is old the tv CRT-(tv tube) it CRT Yoking circuitry not good as before.The tv deguassing coil in not eleminating all the interference of the tv functions anymore.Move the tv unit to the right or to left like about 3 or 4 inches either sides will help for this problems.
It sounds like your TV may need degausing.
Is your TV situated near to any loudspeakers or other devices with large magnets inside them? Or has anyone been near your TV screen with a magnet???
You need to try to get the screen demagnetised (degaussed). Many TV engineers have a degausing coil that could do this. It only takes around 20 seconds at most.
Some TV's like Mitsubishi have a DG button on the remote, that does this function without the need to call out an engineer! It only needs one press of the button every few years!
If you leave your tv in standby try switching it off properly at tv switch leave a few hrs then switch on.
Have you got hifi speakers or anything that is magnetic near tv if yes move it away from set switch set off wait a few hrs then switch on.
Or if the above has not sorted problem the set has a fault with the degause circuit. Its not to bad to repair but you will need to use soldering iron.
Hi there my t.v has a similar problem, I turned it on and the colours arn't right, there the colours go out in three circles mainly mainly blue, green, red yellow, but depends whats showing on the t.v? Please help.
Do you have any large stereo speakers near your tv? They have large magnet in them.
It sounds like your screen is magnetized
Your set has an automatic de-magnetizing circuit built into it. This circuit could have failed.
If you have large speakers near your tv, they need to be moved,but you did say that you're sure that no magnetic field was near your set.
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.