I own a (legitimately) purchased Samsung TV (upwards of $3k) from ~2016 or so. It's been a fantastic television up until it suddenly stopped working about a month ago. I figured it would be easy enough to get it serviced and first tried purchasing the suspected bad part (the external HDMI "smart connect" box) directly through Samsung. Discontinued. Ok....I tried the manufacturer service center which routed me to a local repair shop with literally 2 stars on yelp and absolutely terrible reviews.
I ended up contacting a 3rd party repair company that specializes in Samsung TV's in San Francisco. I told him the model and he basically laughed and said the part is completely discontinued and he can't purchase it from any of his suppliers and that I was basically SOOL.
Spent about two weeks searching online and finally came across a SINGLE listing on EBAY for the model I needed. It seems to possibly be the last of its kind in existence.
The TV works again...until this part or another fails. So yeah, that's my Samsung anecdote.