Having a big yellow spot background in the middle of the picture.

Hi Brandon,
I am afraid that the dark spot in the screen is not repairable. Manage as long as you can or go for a new tv.

Yes, if the spots are round or teardrop it may be burnt picture tubes.

Easy to confirm this by covering lens of tubes one at a time with set on and see which removes the blotches.

What happened in a lot of these sets is the set arcs and burns a black dot dead center in one or all three of the screens of the picture tubes used--fatal case and permanent.

Probably a bad backlight tube. It would look like a darkish about 1" (2.5cm) wide streak running near to horizontal part or all the way across screen.

you most likely have a bad light engine.

Best Solution posted on Apr 12, 2008 Asker's Rating
MikeNJ1964
Rank: Guru Sony Expert
Rating: 89%, 674 votes
You have a completely different problem. The screen voltage for the blue picture tube is slightly too high on your set. This will put fine lines in the background of the picture, called retrace lines. This is very common and easy to correct. Remove the front speaker cover and the access panel behind it. Look inside and you will see a black box with six controls, each control having a little white glue on it. This is the Focus/Screen block. Three controls are labeled Focus and three are labeled Screen. The screen control in the center is for green but I am not sure if the screen control on the left or right is for blue for your model. With the TV on, set it to VIDEO 1 but do not connect anything to the VIDEO 1 jacks. This will produce a pure dark picture, showing any faint lines in the background. Choose one of the screen controls and increase (turn clockwise) it slightly. If the blue lines do not get brighter it means you are turning the red screen control, so put it back where it was and choose the other screen control. When you find the blue screen control, decrease (turn counter-clockwise) it until just when the blue lines are gone. If you want you can check that the red and green screen controls are set to just below the point where their faint lines are visible. When done, replace the panels and your picture will be back to perfect.
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new MessageRate('spn1737581','spn1737581cnt','spn1737581stats','spnRateWord1737581','div1737581_yes','div1737581_no','imgStar1737581','ancChangeRating1737581','divChange1737581',1737581,0,0,0,false); Solution #2 posted on Jul 04, 2008 Asker's Rating
gator149
Rank: Apprentice Sony Expert
Rating: 0%, 0 votes
MikeNJ1964 was exactly right! I have a Sony KP-65WV600 that had horizontal green lines that showed when the picture was darker. I had to remove 3 screws on the right and left side of the tv holding in the speakers...carefully pop out the middle panel from the clips holding it in....remove 4 screws from the cardboard in the middle and remove the cardboard. I then saw the six screws. The adjustment screws were the three below. I turned the middle screw until the lines dissapeared. I tried the left screw and blue lines appeared which I then adjusted away.
THANKS a bunch. SAVED me money!!!

bad optical block

the lcd panel for the blue is bad normally you would have to replace the engine but i know a place where you can get it rebuilted for a price cheaper than the engine go to
N-home tvservice.com for some answers

http://repairs.sunnyoasis.com/sonylcdtv/ this is a link on what to do i had same problem picture is like brand new now good luck this takes about 3 to 4 hrs

You have a completely different problem. The screen voltage for the blue picture tube is slightly too high on your set. This will put fine lines in the background of the picture, called retrace lines. This is very common and easy to correct. Remove the front speaker cover and the access panel behind it. Look inside and you will see a black box with six controls, each control having a little white glue on it. This is the Focus/Screen block. Three controls are labeled Focus and three are labeled Screen. The screen control in the center is for green but I am not sure if the screen control on the left or right is for blue for your model. With the TV on, set it to VIDEO 1 but do not connect anything to the VIDEO 1 jacks. This will produce a pure dark picture, showing any faint lines in the background. Choose one of the screen controls and increase (turn clockwise) it slightly. If the blue lines do not get brighter it means you are turning the red screen control, so put it back where it was and choose the other screen control. When you find the blue screen control, decrease (turn counter-clockwise) it until just when the blue lines are gone. If you want you can check that the red and green screen controls are set to just below the point where their faint lines are visible. When done, replace the panels and your picture will be back to perfect.

PIP DISPLAYED IN ALL FOUR CORNERS OF PIX. UNPLUG UNIT MOMENTARILY TO RESET. or the pip modual has failed.