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Make sure the cable is connected correctly and the connections are seated properly.
HDMI transmission errors can also be caused by damaged cables. To be sure that a working cable is being used, it is advisable to use a different cable or to test this cable on another device.
A loose contact on the cable or the connection will cause interference. Therefore, move the cable carefully back and forth and check whether an image appears.
The HDMI port on the unit may also be defective. Therefore, check whether the HDMI cable works on another device.
To get a picture on the TV, the correct input source must be selected. You can usually select this on the remote control with Source.
High-resolution signals, such as a 4K signal, must be transmitted with an HDMI cable of standard 2.0 or higher. No signals are transmitted with cables of a lower standard. You can find further functions for the individual HDMI versions here.