Philips 56PFL9954H/12B User Manual page 206

5.2.2 HDMI 1/2
An HDMI connection has the best picture and sound
quality.
One HDMI cable combines video and audio signals.
Use HDMI for High Definition (HD) TV signals.
An HDMI cable transfers picture and sound signals in only
one direction, the opposite to a scart cable.
Do not use an HDMI cable longer than 5 m.
...