Kp57hw40 is a greenish color

Might try the color tones buttons on T.V. up or down.

Your "light engine has possibly gone down on you, did you replace just the bulb it's self or the complete bulb assembly? If you pulled out light assembly and replace just the bulb then repalce light assembly, if you repalced the whole light socket assembly and still have greenish color the you have a "light engine problem". Seek repair tech.

well it seems you have an issue with one of your video boards, it could be that the Analog Video Board (the one with the inputs and outputs) is partially damaged, but it can also be your Digital Video Board, which is the one that projects the image

You need to remove the front tv panel, search for the screws right behind the screen and speaker area on the sides of tv. Should be four of them, carefully remove the lower have/quarter and you will find a control box, 6 knobs. Try adjusting them to clear the problem, each color has its own knob, be sure to mark their original position befor adjusting. When you find the red adjustment knob, you should be able to turn it down enough so that it doesnt overpower the rest of the colors. Good luck.

there may be a green tube issue or there could be a screen voltage or screen control adjustment issue. There is a control block with six adjustment screw inside the front panel in front of tv. WARNING high voltage exsit in this set and adjusting these controls really should only be done by a tech,....So be careful

You have a bad optical block, the block has a 2 year warrnty but you will have to pay labor to have a tech change it

I have the same problem... today I got a digital satelite tech come out and hooked a HD digital reciever to the tv and now I have the greenish/yellowish/blue tint hhhmmmmmmm?

Reset RGB screen controls....located behind lower front speaker
grill & access cover.....turn down ( CCW ) green screen slightly
and other two colors as needed.....T.

It is an adjustment, but it's an adjustment you may not want to do. It's the red screen control. It's located behind the front panel so the entire front panel has to be removed in order to access it-which will expose you to hazardous voltages. if you like, I can post detailed instructions on how to get that front panel off, it's kinda tricky.

Check the Fly-Eye lens and the RGB panels.