Samsung QET 85" Class 4K UHD Commercial LED Display - Manual (Page 98)

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Source device issue
A beeping sound is heard when my PC is booting. If a beeping sound is heard when your PC is booting, have your PC serviced.
Touch function issues
Touching does not work when PC connection is used.
Check whether the TOUCH OUT port on the product is connected to a USB port on the PC using
a USB cable.
Touches break, reaction speed gets slow, and so on.
Make sure that there are no foreign substances on the screen surface.
Check whether the screen is broken.
Make sure that the product is not exposed to direct sunlight.
Other issue
The product smells like plastic. The plastic smell is normal and disappears over time.
The monitor appears tilted. Remove and then attach the stand again to the product.
Audio or video cuts out intermittently.
Check the cable connection and connect it again if required.
Use a standard cable.
Small particles are found on the edges of the product. The particles are part of the product design. The product is not defective.
When I try to change the PC resolution, a message " The
defined resolution is not currently supported. " appears.
The message " The defined resolution is not currently supported. " appears if the input source
resolution exceeds the maximum resolution of the display.
To resolve the issue, change the PC resolution to a resolution supported on the display.
There is no sound from the speakers in HDMI mode when a
DVI-HDMI cable is connected. DVI cables do not transmit sound data.
Make sure to connect the audio cable to the correct input port to enable audio.
HDMI Black Level is not functioning properly on an external
device with HDMI YCbCr output.
This function is available only when a source device with RGB signal, such as a DVD player and
STB, is connected to the product to HDMI cable.