Loading ...Uh oh. A poster here named Andy pointed me to a thread over on AVS where some Mitsubishi WD-XX732/831 owners are reporting “white bleed” or “blooming” problems with the Mits light engine. Some of the users have replaced their light engines multiple times already and our friend Andy already had his replaced once before and is having trouble again.
Take a look at some of the example posted by users as to what the issue looks like:
It’s an interesting effect. I’ve never seen it, or maybe I just haven’t noticed it before, but you better believe I’m going to keep my eyes peeled for it now.
Now I’m on pins and needles 
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June 17th, 2007 at 11:49 am
This happened to my set after I replaced a blown lamp. The original lamp shattered with a loud bang after seven months spewing glass all over the inside of the lamp assembly. I suspect the lamp’s mercury has contaminated the light tunnel with light reflecting off the walls. I am awaiting a replacement light engine ass’y by mid-week. I’ll follow up after the replacement.
June 17th, 2007 at 12:59 pm
Bob thanks for following up… any idea why the lamp exploded? Was your viewing environment unusually hot? How long had the set been on?
I didn’t know that could happen, that really sucks… thanks for the heads up. Atleast I’ll know what is going on if it happens to me.
June 17th, 2007 at 1:35 pm
My set had been running for about four hours with the room temp ~72F. There was no visible sign of dust blockage on the lamp vents after it was removed. The lamps are under pressure while operating with mercury vapor being the primary constituent. The exhaust air temperature now from the fan is 131.7F, and airflow seems normal. The local tech admits he had never seen this effect before, but he was more than willing to exhaust any avenues to clean it up. This lamp is rated at 180 watts. It uses a ballast to create an arc across the electrodes. 180 watts is a lot of heat. With the electrodes very close to the lamp’s glass tubing, a great deal of heat is transferred directly to the glass. Previously, the longest continuous timeframe with the set turned on was 13 hours.