When I recently had to deal with a defrost issue in my Samsung refrigerator, I found the defrost drain located inside the freezer. It took a bit of searching, but I eventually located it at the back of the freezer. Specifically, it was positioned at the bottom of the freezer.
Initially, I was a bit confused because the defrost drain was not immediately visible. It was actually hidden behind a plastic panel that needed to be removed. I had to unscrew the panel to access the defrost drain. Once I removed the panel, I was able to see the small hole that served as the drain.
I must admit that finding the defrost drain was a bit tricky, but with a little patience and some exploration, I was able to locate it. I would recommend taking your time and carefully examining the back of your freezer. Look for any panels or covers that may be hiding the defrost drain.
In terms of the physical appearance of the defrost drain, it is relatively small in size. It is typically just a small hole in the freezer wall. The hole is there to allow the water from the defrost cycle to drain out and into a collection pan or tray located at the bottom of the refrigerator.
To summarize, the defrost drain in a Samsung refrigerator can be found inside the freezer at the back. It is often hidden behind a plastic or metal panel that needs to be unscrewed in order to access the drain. The drain itself is a small hole located at the bottom of the freezer.