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If there's a constant green blinking light, There's another post on this problem. Check out solution #9, Chris and Nat. They call it the green blinking light of death, but it's actually not too hard to fix thanks to these guys. We had no soldering experience, but the pics and the steps were right on (although we had 7 capacitors to replace, not 4). We were able to fix our TV for less than $15, and less than two hours of work.
John, my thoughts is something in the main power supply. I don't know what an opto chip is but I've heard of Optocupler IC's. May be a good idea to give a call to some local TV Repair Shops especially ones that work on Philip's and see if you can speak with a tech to see what their thoughts are on what the problem is and what a repair cost may be. The issue is one of hauling it to the TV shop or having them come out to you. Blessings, A/V Media Guy
You were told correctly, you have a bad lamp. When the lamp gets old, the reflector becomes cloudy and instead of reflecting the light, it converts it into heat. As the lamp heats, it draws more power, eventually too much power and the set "recycles" because the lamp is drawing too much power. Replace the lamp, use an original Sony lamp as the aftermarket replacements are known troublemakers. If the bulb fixes the problem (and I know it will because I fix these TV's everyday) be sure to rate this solution. Thanks!
Vertical protection is what the two error code is. You can get a new Vertical output IC at the following link just leave them a email indicating your model number and what youre needing. They respond quickly. http://servicemanuals.vstore.ca/
Sounds like it could be the entire light engine. The part is available on the Internet, but it runs $700 - $1200 without the lamp (although it sounds like you could use your existing lamp without a problem). These parts, however, are notoriously hard to find and may be backordered for months.