Sony wega 50 inch television

sounds like it's toast http://community.sony.com/t5/Television-Picture-Sound/Vertical-Lines-of-death-KDL-52W4100/td-p/29582

Thats caused by a bad optical block. The cost of that repair will almost always be greater than replacing the TV.Thats a very common issue with alot of Sony DLP models which suffered that optical block issue with the blobs of color usually blue or green

do you have a picture of this problem

blue dots on screen

Hi,
I'm afraid, it is problem of optics unit block (light engine), there are 3 LCDs red-green-blue for color picture formation and blue LCD sounds bad, please call local TV tech for fix.
Thanks.

If its model number is KF-50WE610, had you replaced its Lamp recently?
If Lamp is replaced, please check Lamp cover/ door that is not seated properly, make sure its fixed securely.
3 times light flashing shows Lamp cover error.

bad lamp

you need to replace the lamp.

Green flashing is normal. Red flashes are error codes. Count the error flashes.

3x - Lamp cover position or cover detect switch bad.
4x - One or more fans failed RPM test
5x - Lamp power supply/ballast failure
6x - Thermal fuse failed (usually)

Possible themal sensor. Easy to bypass too!!! Check with authorized Sony repair facility.