What type of HDMI cable should I use to connect external devices?
Use a certified HDMI cable with the HDMI logo attached, specifically an Ultra High Speed HDMI®/™ cable that is 3 m or less in length. If you do not use a certified HDMI cable, the screen may not display properly or a connection error may occur. For optimal connection, HDMI cables should have bezels less than 10 mm thick and 18 mm width.
From the official LG MT57S 24-Inch Full HD Smart TV manual, page 6
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