Interesting video.
That diode looks to be VGL or VGH boost gen. These voltages are used to select or deselect TFT rows. If that diode went bad, the panel probably became really dim or brownish in colour, or blurry. So I'm guessing that they replaced it due to that fault. And that would have been -really- easy to fix!
Chi Mei panels are made by Chi Mei. They're a Taiwanese company that bought out some of Samsung's smaller panel business, hence some of their earlier panels are basically Samsung panels, but the newer ones are mostly different. They have a plant or a few in China.
I don't like Chi Mei panels much. A lot of them have failures due to tab bonds. They're one of the cheaper panels available, but they aren't very nice to watch. Lots of motion blur, poor contrast ratio, poor colour rendering and accuracy. And they have a lot of mura problems in their earlier panels due to backlight overheating.
That one chip on the T-con board (the board attached to the back of the panel) is basically doing everything that's needed today for LCD panels -- it's taking the input LVDS, converting the format, and sending it out to each TAB driver (eight drivers, 5760 subpixels, 720 channels per IC at 15V each... remember R,G,B are separate pixels. Pretty impressive semiconductor design...!) The tab drivers are fairly dumb. They're basically 960 channels of 4-bit DAC (0-15V output), shift registers with LVDS input. 4 bits isn't enough to drive 8 bits of course, so the gamma IC is used to interpolate the TFT's curve to give a linear response. There's 16 levels on each 4-bit DAC of course and usually 12 or 16 channels of gamma (common to the whole panel), giving 192 or 256 levels. Additional levels are gained through time-multiplexed dithering algorithms, but due to the small T-con IC... I'd doubt it's doing that. It's probably a full 8 bit panel.