Two cables do different jobs
The HDMI connection carries the picture, sound and some control information. The power connection keeps the streamer operating. A device visible beside a television can look connected while receiving no standby power from the TV's USB socket.
Google explicitly requires wall power for its documented CEC wake/input behaviour. That requirement concerns readiness to receive and act on a request. It is not a claim that every TV USB port behaves identically.
Observe standby rather than guessing
Note the existing power source. When the TV is on, confirm ordinary playback. Then compare the documented standby/wake sequence using the supplied or specified power arrangement. Keep the HDMI input and CEC settings unchanged so the power source is the relevant difference.
If the streamer cold-starts after every TV power cycle, record the startup screen and timing. That observation is different from an application resuming from a running device. A remembered login does not establish that the device stayed awake.
Do not turn connector fit into a power specification
A USB plug fitting a port does not establish that the port meets the device's power needs. Follow the manufacturer's adapter and cable guidance. Troubleshooting with unsuitable power can introduce new restarts and obscure the original issue.
Likewise, automatic input switching also depends on CEC support and configuration. Correct power is one prerequisite, not a guarantee that every television will perform every control function.
Keep the finding narrow
A useful outcome is knowing whether the device remains available in standby with the specified setup. If wake still fails, investigate the control path and TV setting using the manual. Do not replace service credentials to address a power-state issue.
This article concerns a documented Google streaming-device requirement. It does not specify adapter ratings for other products or claim a tested hardware configuration.
A restart has visible consequences
After changing to the specified power arrangement, distinguish an operating-system startup from an app reopening. A logo, device boot sequence and app sign-in prompt occur at different stages. If only the app restarts while system menus remain ready, a standby power explanation may not fit. Record that narrower sequence instead of assuming every lost playback session came from the television USB supply.
Sources and scope
Scope notes distinguish published documentation, supplied information and editorial methods. They do not report a hands-on service test.
- Google streaming devices: HDMI CEC — Official current support excerpt: automatic input/power behaviour and wall-power prerequisite; not a universal TV certification.
