Why does the power cord on my new Samsung Samart TV detach?

Hmm...my 13 year old plasma has an IEC  female connector for a power cord. 
Doesn't seem unusual. i always thought it was standard for most flat screens.

I even discovered using an aftermarket power cord can improve the picture quality.YMMV

My old Samsung Plasma TV had the IEC connector as well and going for a better PC really improved the picture.

My new LG OLED TV's PC is captive so it might be because they don't draw much power compared to LED and Plasma TVs. The picture is great so no complaints here.

All the best,
Nonoise

One reason is in case you mount the TV on a wall and run the PC behind it.  You are supposed to use an aftermarket cord that's rated for that.  Not everyone does however.

It's so you can change the power cord to a better one.  It makes the green look more green, the yellows will really "pop", and Donald Trump will look a more natural shade of orange.

Because SAMSUNG SERVICE SUCKS, so it makes it easier for the technician to carry out the panel only. 😬

I am the proud owner of a new Audioquest NRG-1 2-meter power cord for my LG Smart HDTV. Hey, gotta better than the stock cord. $50 new on eBay. Solid core rocks!  It’s a no brainer. 🧠

From Audioquest’s web page:

No matter how perfect an AC power source, distortion is added within any AC cable, especially within a stranded cable. Even the most sophisticated filters and power supplies cannot eliminate this cable-induced distortion.

FEATURES

SOLID LONG-GRAIN COPPER (LGC) CONDUCTORS
Long-Grain Copper (LGC) has fewer impurities and fewer internal grain junctions, reducing distortion and digital timing errors.

STAR-QUAD HYPERLITZ GEOMETRY

COLD-WELDED CONNECTORS
Cold-welding bonds the plug to the wire using high pressure, not high heat. This ensures that the character of the wire is not changed at the point of termination.

Everyone (well, almost everyone) has freedom of choice. Like your humble scribe who btw is enjoying a better picture as we speak. Without breaking in the cable or the graphene. Or breaking a sweat. Oh, my! Uber Skeptics have no freedom of choice as they cannot seem to thimk outside the box.

Check this out:

http://www.ieclock.com/how-it-works/?vid=1

http://www.qualtekusa.com/products_plug_assemblies_clips.php