Anon, the bulb/lamp plugs into the ballast, The attached videos shows the ballast and location near the end of the video. Check the attached links. Good luck
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HITACHI how to replace your enclosure guide
Mitsubishi Toshiba Samsung DLP TV Bulb Won Turn On DIY Easy DLP Ballast...
hitachi ultravision dlp tv replacement ballast Google Search
SOURCE: I Have a Hitachi Ultravision projetion TV Ned help to fix it.
This sounds like the solder joints on one of the convergence output IC's have cracked loose or the IC itself is defective and quitting when it warms up. The IC needs to be either resoldered or replaced.
SOURCE: hitachi ultravision
Check IC601, C603 for leakage, I601 and vertical pulse detector QN05
for poor convergence check RK42 for open circuit.
SOURCE: PROJECTION TV HITACHI ULTRAVISION COLOR CONVERGENCE PROBLEM
it sounds like your blue convergence ic is getting weak you need to replace the ic's STK392-110 and you should replace both because when 1 is bad the other will go real soon. They are inexspensive at the sight I posted and you will also get free tech online support if you purchase them there.
http://servicemanuals.vstore.ca/
SOURCE: Rear projection HD Hitachi Ultravision always has greenish tint
This is what you're going to do, Turn on the Tv and go to the service manual, if the green tint is still there, you have a defective dmd board, but if it's no there, then you have an issue with your video board
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