Applies to: Sony TV with documented BRAVIA Sync/HDMI control and several connected HDMI devices; safe reconnection is practical.
The useful distinctions
- Sony documents power and input behaviour through BRAVIA Sync.
- Sony recommends one-at-a-time external-device reconnection for relevant control symptoms.
- CEC behaviour depends on the compatible device configuration.
Define the trigger
Write the action that precedes the event: waking one player, powering off a receiver or selecting an input. Unwanted control is easier to investigate when the trigger is repeatable. Record the TV’s actual input and power state afterward. Avoid combining unrelated automatic timers and HDMI device actions into one unexplained symptom.
Build the chain deliberately
Use the manufacturers’ safe connection instructions and add one device at a time. Keep control settings recorded rather than changing them during every reconnection. A problem that appears only after adding one device identifies a useful combination to investigate, not proof that the newest device is defective. Interactions among devices and retained settings can matter.
Preserve a useful minimal case
A support report should include the smallest combination that reproduces the event, the trigger and the observed input/power outcome. If an audio return route depends on HDMI control, note any effect of isolating devices before adopting a permanent arrangement. Restore only supported connections and avoid a factory reset merely to create a cleaner-looking test.
A focused way to proceed
- Record the unwanted power/input event and all connected devices.
- Follow manufacturer instructions to start from a safe minimal configuration.
- Reconnect one device and observe the same trigger once.
- Repeat for each supported device while logging the resulting event.
- Keep the smallest reproducible combination for manufacturer review.
Worked example · synthetic
Hypothetical example: the TV remains on its selected input until a particular player is reconnected and awakened; the event repeats with that small combination. The user sends those device models and the wake trigger to the manufacturers without blaming every connected HDMI component.
When to stop or ask for help
Interoperability varies. Isolation can affect audio return or control convenience; do not assume disabling all HDMI control is an equivalent permanent fix.