I consider myself fortunate after reading the constant horror stories about these sets over the years!
I bought my 57831 in 2006 and have only had the 'airflow sensor' problem. Luckily, I have never had an issue with the screen image/LE. Have gone through 3 lamps which is expected, but now have a problem I can't seem to diagnose..
TV was working fine last week but then had the 'blinking green light' issue. Got the Error Code '66', never getting a red light nor the code for a bad lamp. The bulb looked fine and it seemed like the ballast didn't arc at times, so decided to replace the ballast first. After installing the new ballast, I did see the arc, but that didn't solve the problem; I still received the same error code after the TV shut off after trying to ignite the lamp 3 times, as is usual. Old lamp never turned on.
I then decide to get a new, inexpensive OEM lamp to make sure the problem isn't with that. Well, put that in and it did light!... but a few seconds afterwards it turns off, then the TV shuts off right away. No lights and cannot get a code from it. I left the TV plugged in last night and now do have a flashing yellow light for a bad/no lamp, but after a reset and getting it started again the same thing happens- lamp turns on for a moment, then the entire tv shuts down.
Has anybody had this experience with this or have any ideas what the culprit might be?
I don't know what my next course of action is besides getting rid of the tv.....anybody in the Maryland area need a Mitsubishi factory stand or a 'slightly' new ballast?