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Try disconnecting all of your HDMI cables and plugging the power cord of the TV into another wall outlet. If this resolves the issue, you may have had a small power surge from either your wall outlet or one of your source devices. It is recommended to connect your TV to a surge protector if you haven't done so already.
If you project it on a distant wall the convergence will be way off since the tv was designed to project it just a few feet at most onto the screen. So you would have to do some manual adjusting...
As for the screens you need the two layers...if one is broken get a broken model like yours on Craigslist for parts or check with www.TvRepairKits.com for screens...they are stocking some
Some history for you---several years ago Hitachi began along with others to have issues with the optical light engines.
With a mix of high heat from a lamp into the engine (it has a blue,green and red section inside---guess what? BLUE is the first place that gets the heat and is damaged----minus blue and you have red and green which equals YELLOW.
Several of their sets made about 6 years ago (research 50v500) had exact same issues and were settled in a class action lawsuit.
The issue can but does not always affect the entire screen.
The question really is: This set really worth the part and labor cost for the repair?
On that earlier model I replaced under warranty over 40 of the engines. Also Sony and others have had similar issues some of which were settled in court.
Since you don't have any white lines with the red screen/picture I would say that the red bulb (CRT) is conducting too much. There is an adjustment control for that. The 'sceen' control is behind the speaker cover and service cover. Turn red screen control slightly to the left until you get a good black and white picture.
Rear projection t.v.s work differently than most. They have threw lights that throw the picture onto the screen, instead of having a color tube that is in a traditional television. It would be my suggestion to bring it to a Qaulified T.V. professional to have watever bulb is bad replaced. odds are it will either the blue or the green(hard to remember exactly but i think its a green one lol) and not the red.
I have a Toshiba 48" rear projection TV which started to show red and green lines on the left side of the screen and have also started affecting the left-hand focus of the image shown on the screen. I have had this TV for 14 years and had a projection adjustment done once before.
I have successfully used a feather duster taped to a vacuum cleaner
extension tube with duct tape. Remove the back panel of your projection
television, then remove the the rectangular panel near the top over the
chassis where the cabinet exposes the inside screen area. You will see
the red, green, and blue CRT lenses. Insert the feather duster through
this rectangular opening and sweep your cob webs away from the screen.
Works for me every time.