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Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
The question I'd like to ask is, Has it been determined as to why the color wheel exploded in the first place?
Also, depending upon *what* exactly and in all details, the tech did. Dimness of the screen could be caused by several different things in several different places - e.g. a readjustment made to some values/settings in the TV that affect brightness.
You could try doing a factory settings reset on the TV, first of all (if that is possible with this model) in order to see whether a changed setting was the problem.
It could perhaps... but I am rather weak on color wheel TV problems, so I feel that this is the right time for me to Opt Out, and open this case to other Experts in this category - particularly to one with Color Wheel TV expertise.
Thank you for following the process this far.