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The key here is you have to unplug it---it means the problem is related to the microprocessor which may become confused because of an issue elsewhere in the set---no real easy answer except it may be expensive to locate and fix.
very easy. there is 1 thumb screw behind left speaker grill.unscrew it to remove the grill.the lamp is behind that.after changing the lamp,go in to CUST.MENU,scroll down to reset lamp timer. Best price for lamp is pureglare.com. Inspect the lamp for internal glass particles for 100% verification of being bad. Also at the root of the glass stem in the middle look for bubbling of the glass. This is another sign of a bad lamp.
I had the same problem with our VS-55705 Mitsubishi. It seemed to me that this was a problem of heat.
I unplugged the TV and then took the cover off of the back of the it. I then used canned air to blow off the collection of dust from the components. Then I vacuumed as close to everything as I could without touching any of the components. I then used glass cleaner to clean up the surface of the three bulbs.
I plugged in the TV and it has worked perfect ever since. I haven't put the rear cover back on it yet. That could have been all that I needed to do to fix it. I'm too busy enjoying a nice picture to try putting it back on. Cleaning the bulbs really helped the quality of the picture.