Samsung UN55TU690TFXZA Manual page 150

HDMI IN
For better video quality, use an HDMI cable if your external device supports it.
LAN HDMI Satellite
If you are using a set-top box, check the cable connection. The cable you need to check depends on the type of set-
top box.
Make sure that your access point is connected to the Internet. If not, disconnecting and reconnecting its power cable
may be required.
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