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Half of my Toshiba 50HM66 TV is dimmed and other half is normal. This dimming started on the right side of the screen and then keep expanding to the middle and now it is almost half of TV screen. I tried replacing the lamp but still the same. Is this a light engine problem or something else?

Hi,

Usually when this happens is related to a bad DLP chip, which is part of the DMD Board (Digital Micromirror Device) and light engine.
Watch this video that will explain you how your TV works:
http://www.youtube.com/watch?v=eD_xZcYQE50

After watching the video you will comprehend that half of the DLP Chip is failing, you have a image since probably 1 column of mirrors is working and 1 isn't, 1 working, 1 not, 1 working, 1 not. And it creates the effect of dark image.

Our sponsor's have the light engine:
http://www.discount-merchant.com/TOSHIB ... 180248.htm

The DMD board is the one on the bottom inside the metallic enclosure, the dlp is under the big heat sink.
There is people selling bare DLP chip's, but it will be hard to find one for a Toshiba TV.