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My Samsung HLN567WX color wheel just went. The lamp has 17000+ hours on it, so I will replace it also. Is replacing the ballast required? / a good idea?/ or not necessary? Any other things to do while it is opened up? Would like to only make one parts order and one job. Set is 6 years old. Would like another 3-4 years from it.

Hello donchilton.
The ballast is not necessary required, but if you are willing to spend, and keep the tv for another 4 years or more, I would recommend it. I explained a little more detail on a previous post about the components of these DLP TVs viewtopic.php?f=10&t=1249&p=4172#p4172
Well back to the issue on hand. The light engine and DMD board fail only when you abuse the TV pretty good, so I don’t think its necessary replacing them.
If you have any more question, let me know.
Good luck.