Sorry to be the bearer of bad news but I have the same model Sony with the same problem it was just returned from the repair shop (not to mention a $95.00 diagnosis charge) I was told that it will cost $700 to repair. The bulb in the back is gone and Sony no longer makes it so it would have to be re-built from scratch. I'm done.....
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Sony TVs has an Optical Block issue. If there is an issue with the optical block, then there will be green, blue patches or tint on the TV display. Try resetting the TV to the factory settings and try Power resetting the TV. Turn Off the TV and remove the power plug from the wall outlet for 1 minute and reconnect it and check the operation. If the issue still persists, then TV may require service. You can contact the Customer relations team and check for the available options. Sony had repaired free of cost for such issues. Hence, contact the customer relations.
Sounds like the picture tubes are failing,common on sony. do you notice any thin horizontal lines? You mite get lucky and be able to adjust the voltages. Remove back cover and look inside to see which tubes are lighting up.The front panel below the screen will come off and behind it is a small access cover.remove it. there you will find the voltage controls (its a plastic square with 6 knobs). 2 knobs for each tube, 1 is focus the other is the voltage labeled "screen". they are marked so look closely. Green is always in the middle but sometimes they flip the controls for red and blue so pay attention to which you are controlling .slowly adjust screen voltages to see if you can get it to stay on. If you over do it those thin horizontal lines will pop up and the tv will shut off again. If you already have lines back off the voltage by turning knob to the left slowly until they diappear. If that seems to fix it but the problem but it comes back later, then the tubes are shot. good luck!
it sounds like the blue crt is failing Pull the front off and turn the tv on When it still has a good picture tap the blue crt if it flashes blue with lines across the screen then you know it is a bad crt
completly remove speaker cover untill you can see the electronics. there will be a box with 6 setting screws. on the bottom row of screws , look for the screw with the letter r under it . verry verry slowly turn that screw counter clock wise untill the picture clears up . good luck