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The model indicated does not have a "bulb" as it uses 3 picture tubes.
Examine the picture with color set at zero---stand back and look= if the screen has a mostly yellow (all or part of the screen) you have bad Glycol in the blue picture tube(if need explanation ask) and a look in the lens of the Blue tube will confirm this.
If able with back off and a small mirror look in each lens--red picture, green picture and blue picture.
If the Blue looks like a floodlight with little or no image--bad glycol in that tube.
The convergence ICs and feed resistors need to be replaced. You can get the repair kit for your specific model at the following link. The convergence repair kit contains the replacement parts and the step by step repair proceedure on CD. Very easy repair. Just look under the JVC repair kit category http://www.tvrepairworld.com/
This is a convergence problem that could be as simple as poor solder connections at the convergence ICs. If you can solder and are comfortable working inside the set where there are potentially dangerous high voltages even when unplugged, you can fix this yourself. Let me know if you wish to attempt the repair and I'll provide more details.,
Can you describe the issue a little more? It may be a convergence issue which is quite common on big screens. But there are quite a few issues that can cause a bad picture.
If it's convergence, you'll be able to tell by going to a news channel and looking at the text. If the convergence is bad you'll see a ghosting like image of 2 or 3 letters for each one that should be there.
This is bad convergence. Try self focus and if still not ok is hardware problem. The STK are leaked and need to be replaced. It's not easy, you have to remove the all deflection board and for sure you'll have some resistors to replace too. I sugest you to call a tech, but first try the self focus.