Help with Hitachi Ultravision 50vg825

[Sylin]

I inherited this TV after a friend passed away. His family said the lamp had gone out recently, and it needed a new one.

So I picked up one on eBay from a vendor I've bought from before (my TV is a 50" SXRD). Then I gave the lamp and the TV to my father, as his TV was on the fritz (and I'm happy with my SXRD).

Dad called and told me that the lamp enclosure that came from the eBay vendor did not match the original enclosure, but he swapped the bulb between enclosures (using gloves--my dad is very technically proficient).

Upon turning on the TV, he observed the screen has a very noticeable yellow tint, emanating from the center of the screen, on all inputs. I brought over my PS3 and HDMI cable, and even after adjusting the video settings using DVE HD, I can't get a proper white on the screen and the color is definitely off.

I'd hate to toss out an otherwise good TV, especially after spending $150 on a lamp. Any thoughts as to what might be wrong, how to go about fixing it, and how much it should cost me?

Thanks!