one thing I would say regarding the actual manufacturer of a set, it's relatively easy to find out in the two most popular cases (Vestel and UMC).
UMC have the connections in an "L" shape, with the HDMI connections and power at the bottom/facing downwards whereas with Vestel the connections are in a square panel on the back and usually have a single wheel control for power/source/volume/channel that just goes up/down and in.
On Vestel there's an even easier way - the serial number on the back has 4 numbers which have a box around them - and that denotes the month and year the set was manufactured in.
Put simply though - there are 6 brands which don't use Vestel at all - Hisense, LG, Philips, Samsung, Sony and TCL. In the case of Philips, it's because Taiwanese company TPV bought out Philips CE's television division a few years back. TPV are one of the largest (probably the largest) manufacturers of PC monitors - if you've got an LCD monitor on your desk with HP, Dell, Lenovo or AOC badge on it, chances are it's a TPV one.
UMC are much less common than Vestel (and usually cheaper). For a long time they tended to supply smaller screens with in built DVD players - Tesco were a big user of UMC, the likes of Argos and Curry's less so.
Vestel sets are OK providing you know you're buying a budget set and set your expectations accordingly.
But if you don't want to go the Vestel route, then the rule of thumb should probably be if you want a budget set then buy a Hisense or TCL - both Chinese companies, though both put a 2 year guarantee on their sets and their sets do seem to perform quite well. If you're spending a bit more then look at a Samsung, LG or Sony - which one will depend on your budget and which one you like and that may include factors such as the operating system in use and whether you like it, how you find the remote control (a number of the newer Sony sets don't have a 'number pad' on their remote control, which may be fine if most of your viewing is streaming or via a Sky / Virgin box but if you watch more terrestrial TV you may still want the ability to press '1' for BBC1, '5' for Channel 5 etc, whereas with the Sony remote you're going to be into multiple button presses to do that).
one word of caution regarding OLED TV's is that they are more susceptible to burn in than LCD types and don't last as long so they may not be the best option if you want the TV to last a good amount of time.
OK - you've managed to mix two different points up, so let's unpick that a bit. First up, there's no evidence that OLED have a shorter working life than LED sets - some of the cheaper LED sets (from the likes of Vestel and UMC) are known for failing at under 5 years - usually with a couple of 'stock' faults - either capacitors on power boards or LED backlight failures. The problem is unless you have a a local TV repairer who can handle such repairs for a low cost, most people will simply skip the set and buy a new one.
On 'burn in' - yes you have a point there. And that's something anyone using an OLED should be aware of. There's more about burn in here >
https://www.cnet.com/tech/home-ente...n-in is possible with,of, but not worry about. but simply for normal use, it shouldn't be an issue. It is an issue if you, for example, put the TV on a channel with alot of 'static' image and leave it on for long periods of time - examples would be the news channels where you have the logos and 'tickers' fixed on the screen for long periods.
