Changing the resolution of 720 to 1080 is dependent of the input television. Make sure the HDMI cable connection or a PC cable connected properly.
If you uses a PC input, you should set the resolution with 720 to 1024 first. then set to higher resolution. If there is a problem when doing settings dark picture or not support, it means that the TV does not support the resolution.
Perform way above the HDMI connection too.
Hope this helped solve your problem.
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