HDMI CEC Issues with Mixed Brands

[Gardenboy]

Can HDMI CEC cause issues when using devices from different brands, like an LG TV, a Yamaha receiver, and a Roku? What’s the best way to avoid glitches like unexpected power-ons, input switching, or lost control? Would turning off CEC on some devices help, or is there a better setup strategy?

Thanks in advance!

[Tomhanks]

Hi! HDMI CEC can cause issues when mixing brands because each manufacturer uses it slightly differently. This can lead to problems like devices turning on by themselves, switching inputs, or losing control. The easiest fix is to turn off CEC on devices that do not need it, keeping it only where it is useful, for example between the TV and receiver. You can also use ARC or a universal remote to handle power and volume without relying on CEC for everything.

[Gardenboy]

If ARC is enabled but CEC is disabled, will power and volume still sync reliably across different devices?

[Tomhanks]

ARC (Audio Return Channel) requires CEC for most of its control features. Without CEC, ARC can still pass audio, but automatic power and volume syncing between devices usually will not work. In that case, power would need to be controlled separately, and volume adjustments might have to be done on the receiver or TV directly.

[Gardenboy]

Thanks! Is there a recommended way to set up CEC across different brands to minimize those unexpected power-ons and input switches?

[Tomhanks]

To minimize unexpected power-ons and input switching when using devices from different brands, it is helpful to carefully manage how CEC is enabled throughout the system. Typically, enabling CEC only on the primary devices that need to communicate, such as between the TV and the receiver, allows for smooth sharing of power and volume commands without involving other devices that might cause unpredictable behavior. It is also beneficial to explore the settings on each device for options that customize or limit CEC functions. Many TVs and receivers offer the ability to disable specific features like automatic power-on or input switching while maintaining volume control. Keeping device firmware up to date is important, as manufacturers often release updates that improve CEC compatibility. In cases where issues persist, using an HDMI switch or hub with advanced CEC management can help isolate devices and prevent conflicts. These approaches generally lead to a more stable and predictable CEC experience across mixed-brand setups.

[Gardenboy]

Can power syncing between the TV and receiver be handled manually or with another method besides CEC?

[Tomhanks]

Power syncing between a TV and a receiver can be managed without relying on HDMI CEC, especially in setups where CEC causes issues such as unexpected power-ons or input switching. One common method is the use of a universal remote control, which can be programmed to send power and input commands to multiple devices at once. This allows for consistent control without depending on CEC protocols, which may vary between brands. Another approach involves smart home systems, where devices like Alexa, Google Assistant, or dedicated home automation hubs can coordinate power and input switching through routines or voice commands. Some AV receivers also include a 12V trigger output, which can automatically power on other compatible components when the receiver turns on. While manual operation using separate remotes is always possible, it may require more steps and coordination. These alternatives provide more predictable behavior and help avoid the compatibility quirks that can come with CEC, especially in mixed-brand environments.

[Gardenboy]

Thanks again for all the info!