sasaki fujika,
Can you use the Apple TV remote to control your Sony TV? A workaround may be to use the Apple TV remote to control your TV. This can be set up with these steps:
- "Open Settings on Apple TV.
- Go to Remotes and Devices and turn on Turn On Your TV with Your Remote.
Use the Siri Remote to control the volume of your TV or receiver
- Open Settings on Apple TV.
- Go to Remotes and Devices > Volume Control and choose Auto.
- Note: These settings may not work with all devices. For more information, see the Apple Support article Control your TV or receiver with your Siri Remote or Apple TV Remote."
Control your TV and volume with the Siri Remote - Apple Support
To continue with troubleshooting the issue between the Sony remote and Apple TV, try adjusting the connections. This process can help fix controlling the Apple TV with the Sony remote. Here's how:
"If your TV or receiver supports HDMI-CEC, Apple TV uses the HDMI connection to allow it to be controlled by your TV or receiver remote.
If some features don't work:
- Make sure that your TV or receiver offers HDMI-CEC support. For help, ask the TV manufacturer or check the manual.
- Check that your Apple TV is connected to an HDMI port that supports HDMI-CEC. Check the TV manual to confirm which ports support HDMI-CEC.
- Check that HDMI-CEC is turned on in the menu of your TV or receiver. Use the remote that came with your equipment. Because manufacturers often have different names for HDMI-CEC, look for a setting that ends in "Link" or "Sync." Here are some examples:
- LG: SimpLink
- Philips: EasyLink
- Samsung: Anynet+
- Sharp: Aquos Link
- Sony: BRAVIA Sync
* While volume control normally works using the IR sensor on the front of your TV or receiver, some receivers use HDMI-CEC instead. With volume through HDMI-CEC, you don’t need a clear path between your remote and the front of your receiver."
If you can't control your Apple TV with your home theater or universal remote - Apple Support
Have a great day.