Philips CINEMA21:9 50PFL7956 User Manual page 56

Then use an HDMI cable to connect the Disc Recorder to the
TV.
Then use an HDMI cable to connect the Home Theatre System
to the TV.
If you do not use the HDMI -ARC connection on the TV and
the device, add a digital audio cable (optical).
Digital HD receiver
If you use a digital receiver to watch TV (a set top box - STB)
and you do not use the remote control of the TV, then switch
off the automatic switch off. This will prevent the TV from
switching off automatically after a 4 hour period without a key
press on the remote control of the TV.
56 Connections / Connect devices