Not all HDMI cables are equal - use HDMI 2.0+ (preferably 2.1) for modern devices. Look for 'Ultra High Speed' or 48Gbps/4K@120 on cable/packaging, or test with your device's 4K120 setting. Use HDMI 2 ...
If your TV keeps flickering or shows random signal errors, your HDMI cable might be to blame. Here's how to know when it's ...