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Anon, the bulb/lamp plugs into the ballast, The attached videos shows the ballast and location near the end of the video. Check the attached links. Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." HITACHI how to replace your enclosure guide
This is a set first made in 2005. I have seen a few of them with too much red.
Most likely what was adjusted is the RED SCREEN CONTROL. It is located behind the front grill assembly at the front of the set. Screws usually secure it from the back on either side and then it pulls off--held by pegs usually.
Behind it is an inspection plate with several screws. Behind that is a BLACK block about 3 inches square with six controls(everything is black) One row of three will be marked FOCUS--stay away from those. The other row will be marked SCREEN.
With a flashlight you will have to look closely at the two rows of controls--they will have r,g,b marked next to them. (red, green, blue)
If you go to a Black and white program and the background is redish etc--take the set to a unused Video input and after you locate the RED SCREEN CONTROL turn it slowly (less than 1/8 of a turn) to the left---the idea is to adjust just until the screen does not show red---on a blank input it should be black.
Double check it on a Black and White program and then if it was the problem the color should now be normal.
These sets did have some problems with that Screen /Focus block going bad--the entire block costs under 25 dollars and all the wires on the back of it plug in; if you have to keep adjusting it over a short period of time replace it or live with it.
I do this here for free so if this has helped you rate this solution as I do this here for Free.
The easy way to fix this: Click 'Menu' on your remote. Then click 'Setup'. Next, you will have to select 'Screen Position Setup'. This will open a screen that allows you to adjust your TV screen position simply by using the arrow keys on your remote. If your TV is anything like mine, this will work. (I have a Hitachi 51F710A)