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You need to replace the power supply board. The new ones have a bigger heat sink - obviously JVC knows about the problem because they made the new ones bigger. It cost $250 from JVC and I installed it myself - took about 3 hours to do. If you are not tech savvy call a repairman. Hope this helps.
Could be shorted convergence chips. There are two of them in the TV. If they short they will shut the TV down. One quick test is to desolder both of them...then power the TV on..if it fires up the chips were shorted and would need to be replaced. You can get a complete kit from www.TvRepairKits.com
Check the coils on the main board. Coils mean round ferrite donuts (1
inch or less) with copper wires on it. I have seen this come out. if not check convergence amp ic's http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html