This is a big problem for PCs, for example, since they're usually capable of outputting video in a wider variety of resolutions than an Apple TV or Roku would be. Most TVs are smart enough to adapt to any resolution within their capabilities, but some devices that send video to a TV can be annoying in that regard. If neither of those solves the problem, one final, common thing to try is to check resolution settings. In many cases, the order in which these devices are powered on will dictate the success of the handshake. This is an extremely common solution for people with HDMI sources connected to a home theater system or an audio/video receiver. So, if you turned on the display before your HDMI source, try turning both off and then powering them on in the opposite order. In order for the system to function, all devices connected must compatible with the HDMI-CEC standard.If that doesn't work, the next thing to consider is changing the boot sequence.Here are some points to remember when connecting a BRAVIA Sync control system: Utilize two-way audio transfer with eARC/ARC (Enhanced Audio Return Channel/Audio Return Channel) to send/receive audio between the TV and audio system (A/V Receiver or Soundbar).Power On/Off (Device auto power off and TV auto power on).

It allows you to control CEC compatible devices with one remote control. The HDMI-CEC (Consumer Electronics Control) is a HDMI® standard that provides control functions between different A/V devices such as TVs, home theater systems, Blu-ray Disc™ players, Cameras, Camcorders, and other HDMI devices. BRAVIA™ Sync, BRAVIA Link, and CONTROL for HDMI are names of the HDMI-CEC feature on Sony products.

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