The most left 1/4 screen does not seem to be affected by this brightness problem, put the complete screen does not look as sharp as it was when TV is working correctly. Does these symptoms indacate bad TAB bonds.
There's actually a lot of different symptoms that show bad tab bonds.
Picture is sluggish, you get 4 or 5 horizontal sections of picture, you sometimes see the onscreen displays repeat themselves below the original one (even a small bit of it.
Sometimes half the screen turns white or has a milky picture....
A TV set with a rigid plastic frame can make it hard to get it to act up, but flexy frames they show up pretty easily rocking/flexing it back and forth.
I've seen tab bonds mostly go bad in the top corner of the frame especially on the top right corner. I'll flex the top /bottom on both sides, and if the TV isn't too wide I'll grab the top left/right corners and flex it back and forth.
The Zeus engine cannot be located". I have download and installed a version of the Zeus Engine
Don't feel bad....I couldn't get the Zeus engine to work and I know about half the Toshiba tech couldn't get it to work either.
I don't know what Toshiba was thinking when they didn't go with PDF files.
Pretty much, you have to go with common sense, like knowing the rear cover comes off, then the whole chassis -- LCD and boards come out the back. You disconnect the speakers, and the power/Infrared reciever boards from the TV's main board. Then you go around the edge of the LCD frame and remove screws, along with the screws holding the wall mount bars to the plastic frame and literally lift the whole chassis off of the front faceplate.
Here is that TAB IC video -- the guy is doing it to a Sony, but a lot of LCD panels are only manufactured by 3 companies, and the design is pretty much the same. Remove the metal frame and the ribbon cables are right under it.
Did you notice the black/white snow was sluggish until he pushed on the ribbon cable and then it speeded up? That's the sluggish picture I mentioned. And notice the picture faded to a bunch of white streaks too? It's a slow fade to white on his, and any TCON problems are usually a sharp edged failure right down the middle of the picture, or a repeating line color like these --