These sets kp51ws500 had issues with bad picture tubes----this set uses a Red,Green and blue picture tube.
The tubes are only available on a rebuild basis and very expensive. There is one thing that requires no parts replaced you can try: here are the instructions:
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BLUE SCREEN PROBLEM:
You may have a bad blue picture tube but there is a way to
deal with this first----the set has a black plastic block with six
controls---three are Focus(red,green,blue) the other 3 controls are Screen
controls(red, green, blue) Someone has to remove the entire piece on the front
of the set below the screen(usually a plastic part) most of the time it is
secured with 3 screws on either side of the set in the back; once you remove
the screws the entire piece should pull out(pull from right to left(it will not
fall off or come out easy--it is held in with several large plastic pegs) With
it removed there is an inspection plate with 4 screws-----the screen/focus
block is behind it.
You need to look very closely at the block to identify the focus versus screen
controls----one row left to right will be marked Focus and the other row left
to right will be marked screen------YOU need to locate the Blue Screen
control(they are black like the block) With the set on(be careful) go to a video
with nothing connected---if you
see a blue screen as well as the input number turn the BLUE SCREEN CONTROL
SLOWLY TO THE LEFT UNTIL THE BLUE is gone.
If this cures the problem you may only be buying yourself some time----if the
blue picture tube is bad sooner or later this trouble may return----I have seen
sets where this was adjusted and the set worked for a year or more with no
repeat of the trouble----replacing the blue tube would likely cost you 400 -
500 parts and labor.
I do this here for free so if this has helped you take a moment and give me a