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If have already unplugged and waited for atleast 15min. and still no success. Then only if you are Electronicly inclined. Check to see if you get dead completely or you get an indicator light momentarly. Which these are two different symptoms. first dead no indicator. check R931,E994,Q777. Then if indicator light comes on and goes off, check E994 which is fuse opening, C707-1000pf 2kv cap, also check D915, I601, IK04, and 05
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You have a bad light engine (optical block). This is the most expensive part of the TV. Do a search with the model number on Google or Ebay and even type the words "light engine" in your search. You can then find the price of the part. You can find a service manual by typing in the model number followed by "service manual". This will show disassembly instructions.
On this Hitachi model there is a common failure with some capacitors and fuses. Its a simple fix if you know which parts to use/avoid and how to do the repair. You can get complete instrucitons and parts for your model from www.TvRepairKits.com . Their kits include step by step photo instructions as well as the correct parts to fix this issue.