My Hitachi lcd rear projection 50v500 television

Hi, you have an Optical Engine fault. Complete assembly needs to be replaced. This page shows the most common Hitachi Optical Engine Faults.
Hitachi LCD TV Light Engine Optical Block Info

It's just old that's all

I have the same tv and the same problem, but my yellow is a cloud around the outside of the screen. My tv was recently moved, and a repair shop told me that sometimes in a move these tvs light engine takes a shock and causes a yellow "band" on the screen. I am hearing that these light engines are not cheap either. Hope this helps you.

It is a defective light engine and is not a user replaceable part. In most case the part will cost close to 1000 if not more.

Your light engine is going bad.

contact authorized servicer to do a memory initialization in the service mode

yes, you probably have a bad crt, or color wheel that also would need to be replaced. You can try resetting the lamp hours, Actually, I BET YOU HAVE A BAD BALLAST

I see a very large red spot on my screen now. I just replaced the lamp and it seem OK. Now I get a large red spot with no indicator lights. Is there a pending problem?

Deb,
Unfortunately if you're not a technician Hitachi won't even consider sending you a LE for install... They will confirm your status and have you fill-out several documents.
As to the other part of the question, the service manual won't help - there is a procedure for memory re-initializing and after performing that you still have the spot then LE is called for.. But again, unless you're a tech with those letters behind your name Hitachi won't accept the results.
That said, we have done several of these and Hitachi has been exceptional to deal with pre and post install.
Hope this helps!
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

You got shafted!!!!!!!!!!!!!!!!!!!!!!