My tv is about 3 years old and we noticed that it began flashing an overlay greenish color on occasion that could best be seen if the movie(picture) was dark(black). Also, once the tv turned off and back on very quickly on its own. We had a tech come in that used some type of device to clean something at the back and the flashing has stopped for now. Would love to know what to do if this problem happens again and what caused it to happen in the first.
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One color predominant screen is the fault. In most cases, it will be due to some loose solder terminal/s at its video output card [CRT base card]. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
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I hope you have a service plan for this set. Most likely--the CRT"s are going bad. This was a VERY common problem for Sony sets of this age. the CRT tubes SHOULD last a long time...BUT Sony had a BUNCH of the tubes that had 'contamination" on the cathodes of the guns...and after a few years..this 'flakes off" and shorts out the tubes. There WAS a recall on these a couple of years ago, but I am not sure about it now. You will need ALL 3 tubes to fix this problem. If it was me...I would try and find out if there is any way to get Sony to cover it..., if the set is not more than about 8years old.
The grid (called an overlay) is put in place to fine-tune one of the colors, usually green. Once one color is adjusted perfectly, the other 2 colors are adjusted to match the first color. For example, if the convergence data is completely erased, the tech will set up the overlay and align the green using to the overlay, and then align the red to the green and then the blue to the green. If the alignment is being done after replacing the convergence IC's because one or 2 colors are slightly off in the corners, the green is usually very close to perfect and the use of the overlay is not absolutely necessary. It is pretty easy to align one color using the outer edges of the screen itself. If you do need the overlay it can be purchased from any Hitachi parts distributor such as Herman Panson, Fox or Union Electronics.