I saw a HD-70FH97 at the put and take area at my local landfill. It looked like it was in decent shape, so I borrowed a pickup truck, and got it home. First was the broken lamp. I found one relatively inexpensive, and got that installed. So that let's you know about my investment so far.
The picture came up, but it was dim and pink. It looked like all RGB colors were there, but not at the right levels. Adjusting tint, color levels, iris, and brightness didn't help. Resolution looked good with OTA television. However it was really not something I would want to watch. I didn't see much help searching for other people with a similar problem, so I found the service manual, and the JVC HD-xxFH97 Training Manual. Even though it says the light engine should be exchanged if there's problems with it, I opened it up to try to find the problem. Well, I found the problem. (Getting it back together again will be a later problem.)
Just before the DILA prisms is a rectangular piece of plastic about 1-1/8" X 1" with a big burn in it. My question is what that does that plastic do? The training manual shows the breakdown of the light engine's lenses and filters, but doesn't identify this one.
The sections without the burn are clear, it's not polarized, and it doesn't magnify.
I'm wondering if it's just a sacrificial piece of plexiglass to protect the prisms from heat.
Thanks for any help.
Edit: I originally searched this thread for pink and burn, but didn't find much. I see that on this page, posts 6542, 6550 and 6567 have this problem. It must also appear as green for some people. I thought you'd like to see what messes these things up.