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I have a 60" Sony Wega LCD projection...not sure if it will work for your model, but ours would not turn on this morning and was blinking the 3 light error code. Which indicated that the lamp cover was not on. The lamp cover was on, but when you remove the lamp cover there is a small metal piece below where the screw goes to tighten the cover on. That piece needs to be pushed in so the sensor will not go off. This saved us potentially many hundreds of $$ in calling a repair person which is what all forums and threads suggested we do. Hope this helps.
I have seen this flashing before, this could be an indication that the picture tube is weak, what happens is that if the white balance is off there is a circuit called akb it monitors the kathode of each gun and if they are not in balance it will attempt to balance it out. if it can't the picture will begin to flash, sometimes in some models the power light will blink 5 times. On some models the power light will only flash if the tv gives up trying to compinsate for white balance and shuts off compeletely. If you see the tv shutting off with 5 blinks then you know for sure it is time for a new set.
Refere to Sony Blinking Codes :
5 Blinks ===> cause AKB circuit (AKB). Something is wrong with the video. check components on the C board, also check the A board. Also unit be in IK blanking, try turning up screen slightly.