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Amazon Fire Sticks are designed to be used in HDMI ports of any TV regardless or brand or manufacturer. You can plug an Amazon Fire Stick into any of the HDMI ports on the LG 55 inch Class 4K Smart UHD TV with AI ThinQ® (54.6'' Diag), Model # 55UN7300PUF. If the Fire Stick is overheating then you will need to have it inspected. When a Firestick gets too hot, it can negatively impact the performance in many ways. Some tests have shown that the recent Fire TV Stick 4K doesn't get as warm as its predecessors, but there are still problems, even with the newer device. When the Firestick keeps turning off the TV, the issue could be due to a faulty power adapter. While Fire TV Stick comes with a 1 Amp adapter, using a different adapter with a similar or slightly higher power (2 Amp) is known to fix the restart issue. Like any other hardware or software, Fire TV Stick is prone to malfunctions and breakdowns. And when that happens, one needs to be patient for most of the things can be fixed with simple solutions. Whether you are an old or new user of Fire TV Stick, mostly the restart issue is due to erratic power supply. If the Fire TV Stick is connected using the USB port of your TV, remove it from there and plug it to the power outlet using an adapter. That’s because not all USB ports provide sufficient power to run streaming sticks properly...^IFV
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