I have a sony kf-42sx3oou, i have just had the lamp replaced, since replacing it a few blue spots appeared in the top right corner but today a yellow line has appeared on bottom left hand corner, could you...
This problem was probably there before, but you only noticed with the new "Brighter" bulb.
This TV will require replacement of the LCD Prism unit.
This Prism blocks and allows colors so that the 3 LCD images may be mixed to produce the final image you see on the screen. When this becomes damaged or defective, it leaks colors (light). This Color Leakage apears as spots on the screens.
Where you see the spots is where the specific spot on the prism that is leaking light, the specific color that is leaking also.
This parts cost alone is normally $500 to $1000 dollars but is usually replaced under warranty. If out of warranty, I suggest living with it or selling it if out of warranty.
Turn down the Brightness and it will not be as noticeable. I am sure you only see this with bright images.....like white backgrounds and such