Originally Posted by ep1213
I was wondering if anybody has an idea what caused one of the corners on my KDS-55A2000 to be black? Attached are some pictures. I already had the optical block replaced under the recall program, but that was over a year ago.
I don't really know when the black corner started, since it is not in the main viewing area so not really that distracting.
It almost looks like it could be "dirt/dust" somewhere in the picture/light path, but before I go and disassemble the whole TV to clean it, wanted to see if somebody else has an idea what it could be.
Thanks in advance.
The shadow is black, which means it is not in the light engine, but either before or after. The light engine has separate paths for RG&B and only combines the three at the main lens.
Before: remove the lamp and inspect the lamp and the hole. In some of these sets it is hard to get the lamp all the way in, square and fully seated, yet it can still light up.
After: I would take off the front screen and do an inspection of the inside of the mirror/screen cavity. There's black foam rubber seals where the light engine goes into the back and meets the cavity, there's tape around the edge of the two layers of the screen, and there's tape around the sharp edges of the glass main mirror. Any of that stuff could have come loose and be blocking the light. Those tape adhesives rot over time and let go.