I haven't narrowed the problem down to one thing yet, but I get the solid green screen with vertical lines spaced apart when I plug in my dvd player. I have not plugged anything in via hdmi or RGB, but I was wondering if and where I could look at parts for the hd-61z456 tv if needed?

SOURCE: hdmi Issue

Most new HDMI DVD players use High-bandwidth Digital Content Protection (HDCP)on the HDMI output.If you try to play this on an older TV that is not compliant with these new standards it will not work.This standard came out late in 2004 that is why your older player still works. There is also a service bulletin from JVC about upgrading the software on your TV for HDMI compatiblity issues.If you want a pdf file of the bulletin I can send it to you.

SOURCE: Mitsubishi WS-65809 65 in Projection TV problem with vertical stripes

I'm fairly sure that the 2hdw board is the culprit here. The 2hdw pwb is Mitsubishi original p/n# 935c966001 which has since been substituted to p/n#935c966002 and costs roughly $420.00 dollars plus shipping.
It's a common failure in these units, but it's not a difficult repair for a reputable shop..
Another alternative is to have ashop pull that board and send it in to PTS Electronics for rebuild. That might save about $100.00 dollars.
Please don't rate me badly for the bad news.
Good Luck!
Bill

SOURCE: JVC Model No. HD-61Z456 Screen is completely Green

Sounds like the green tube is shot, tap on the green board see if theres a loose connection, with something hard plastic

SOURCE: HDMI input

The green screen is caused by light hitting the back of the tv. Either move the tv to a location where direct sunlight will not hit it or put up strong curtains. As for fixing the problem, do a search for JVC green screen reset on AVS Forum, its easy to do just dont have the info with me now. Keep in mind if direct sunlight hits the back of the tv it will do it again. I have put up some good curtians and ensure not to open them when watching the tv. Hope this helps. I am Hayward, have a nice day.

SOURCE: Mitsubishi Projection TV problem

I just started seeing red lines going across screen and picture has ghost now. Is lamp going bad? Red line is a somewhat u-shape about 1/4 from top of screen.