While we're looking at manuals, does the manual show the IR location?

I find the sensor with the factory remote, not an IR emitter, to be sure that none of your IR system and its possible problems can confuse things. You can't be sure your entire IR system is working until you find the IR receiver, so you can't start by finding the IR receiver with the system. You have to use the factory remote.

Take a book with a dark non-reflective cover and place it in front of the left part of the receiver. Try the remote from three or four feet back. See what happens.

What you are trying to do is be far enough back that the book is truly casting an effective IR "shadow" on the front of the unit. If the unit responds, move the book an inch at a time until you have pinned down just where, left to right, the remote can control the unit. And where it can't. Then hold the book in your hand and move it up and down as you retry controlling the receiver; this should pin down the height of the sensor.

Remember, be a few feet back. This helps ensure that IR doesn't bounce sideways off of cabinet sides or other things that it might.

??
Lower right hand corner. It looks just like a..... well.... It looks like an IR Window.....

Remove back panel, with panel facing down and bottom toward you you'll see a horizontal speaker pressed into the lower left lip via 2 rubber bushings. Remove that. Below that is a plastic cover held on by one philips head screw. Remove cover. The IR sensor is on the left side of that circuit board. You don't need to remove the board, just hot glue the emitter next to it. 30 minutes max start to finish.

Samsung's are always difficult to find. Even with a flashlight you cannot see them. I just had to go stick an emitter back on a tv that the cleaning woman knocked off (despite me telling them not to let the cleaning people near the tv). It was a Samsung LCD and it was about 2 or 3 inches to the left of the center of the tv. I believe the power button was right in the center. I kept hitting "TV ON" on the remote and moved the emitter around till I found it.

Remove back panel... 30 minutes max start to finish.

The IR Receiver is indeed right there behind the little window.

I'll take your word for it. I'm telling you straight though. I had an LED flashlight right up against the clear part of the bezel to illuminate the dark grey area and I saw NO little window at all. I saw imperfections where the front and back of the bezel attached from the far right corner to the far left but that's it. I'll be there again tomorrow thoughWe'll see. Either way it's getting fixed tomorrow.

I just dont understand all the confusion in this thread.... I own a 50" Samsung 8k series.... It looks pretty much the same as this and I have my IR Emitter right on that little smooth window and it works great. All the Samsung's out on my sales floor have that little window as well.

Even all the brushed Chrome finish sets have cut outs for the IR receivers on the front. Maybe the older sets were hard to find, but all the current ones are pretty obvious and clearly identified in the owners manual as well.