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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
It must be connected with the color circuit of your tv, a board connected to back end of the tube. Could be dust, cob web or carbon deposit shorting a transistor. Popping noise if loud enough can be attributed to high voltage circuit fault and picture tube.
Jar-Head, bad news, the picture tube has a mild short in the green cathode, tech can come out and try to restore it but it`s usually a futile attempt on sony tubes, sorry to be the bearer of bad news, BMW Rider
We had a TV repairman look at our 3 year old (Oct 2004) Panasonic CT-32HXC14J FLAT SCREEN TV. It suddenly stopped working and appeared to have no power getting to it. It was a high voltage supply or transformer that was bad and has to be replaced - estimated cost is around $400. In a year we will also need to spend around $125 for a digital converter box. We went for the repair since that is still cheaper than a $1,000 plus equivalent size LCD or plasma.
Our old tube tv was still working after 15+ years. They aren't making them like they used to. Way to go Panasonic.
If you had a burning smell, well the board is toast. These sets are made to replace the entire board at one time. Before installing the replacement module, the picture tube should be checked. A defective picture tube ( such as a G1 short) may cause a failure in the power supply section.
It definitely does not seem to be a problem with the Picture Tube. More like a cold solder. It is definitley not a job for a layman. Also, get a good technician to have a look, as locating cold solders is a labourous and time consuming process. It could also be possible that the main DC filter capacitor is getting dry, and may require replacement.