Samsung QN75QN8 B Series User Manual page 254

Make sure the remote control works properly.
You can check whether the signal is being transmitted by pressing the power button and observing the front tip of
the remote control through the camera on your smartphone.
If you cannot see infrared signals, charge the remote control by using the USB port (C-type) on the bottom, or turn
over the remote to expose the solar cell. If the remote control has batteries, replace them with new ones.
Depending on the model you purchased, the remote control provided may vary.
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