Jvc 66 inch projection t.v. halo repair - JVC AV-56WP74 56" Rear Projection HDTV-Ready Television

Replace the convergence ICs and resistors. You can get the JVC repair kit called the AV48WP30 - AV65wp30 convergence repair kit from www.tvrepairworld.com which contains the ICs, Resistors, and the CD with repair instructions.

If your TV looks 3D, warped, or distorted it likely has a convergenge problem.
If however it just looks dull, washed out, redish, greenish, or blueish or if it looks like objects on the screen have halos the fluid in the lens has soured.
You can search google for parts or you can get the parts with repair instructions from sites such as www.TvRepairKits.com

Thats aconvergence failure. You can get the AV48WP74 convergence repair kit from www.tvrepairworld.com the kit contains the parts and the CD with detailed instructions for the repair.

you need to install the RCA repair kit called the ITC222A convergence option missing repair kit from www.tvrepairworld.com the kit has the Cd with instructions.

Convergence ICs have failed. You can get the convergence repair kit for your model JVC at www.tvrepairworld.com the kit contains both ICs the associated resistors and the CD with detailed instructions.

You will have to inspect the convergence circuit. See if there are burns on the capacitor or there could be a problem with the circuit itself.

replace defective optic engine

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images. 

What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Have you tried cleaning the projectors? I had a halo issue and that resolved it. Good luck

http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html