2009 WD-73737 has been a real champ. TV was working fine at lunch, I came home to find my wife reporting that a dark band had appeared on the top of the screen at some point in the afternoon. No power failure or anything like that. Bulb was replaced approximately 6 months ago with a factory ordered bulb. I removed and reseated the bulb, same issue. I have Googled around, but most people who report this issue never report back what ended up fixing the problem. Any thoughts on this one? Is it a light engine issue?
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