That would be your DMD board, which is located right behind the fan in the center of your TV set.
The older models have some disassembly drawings, but they're worthless compared to the newer models --
Not much detail in those....
The DMD part number is -- BP94-00478A
I Googled about 10 suppliers with your part number. It's either out of stock or no longer available.
I suspect the only way to get one right now is by buying an optical engine.
The part number for the Engine -- BP96-00087A
Here's one --
Looks like the engine is available, but the DMD isn't, so the only choice is to buy the Optical engine with the DMD board on it.
Once you get that part, let me know. I've got better pictures of the light engine and how to get it out.
Most engines on Samsungs all come out the same way. Your model has drawings only. They moved to pictures a few years later and those help you out a lot better than their drawings do.
If you have any questions, just ask
If you are finished, please press the ACCEPT button.
Tips are greatly appreciated !