Samsung UE40JU7000 User Manual page 28

There is no picture/
video.
The remote control
does not work.
The Cable or set-
top box remote
control doesn't turn
on/off the TV or
adjust the volume.
Check the cable connections. Remove and reconnect all cables
connected to the TV and external devices.
Set the video outputs of your external devices (Cable/set-top box,
DVD, Blu-ray etc) to match the TV's input connections. For example,
if an external device's output is HDMI, connect it to an HDMI input on
the TV.
Make sure that your connected devices are powered on.
Be sure to select the correct input source.
Reboot the connected device by unplugging it and reconnecting the
device's power cable.
Replace the remote control batteries. Make sure that the batteries are
installed with their poles (+/–) in the correct direction.
Clean the sensor's transmission window on the remote.
Try pointing the remote directly at the TV from 1.5~1.8 m away.
Programme the cable or set-top box remote control to operate the TV.
Refer to the Cable or set-top box user manual for the SAMSUNG TV
code.
English - 28