Why can't I view both displays simultaneously while using my HDMI splitter?
Make sure your TV and/or A/V receivers are set to the proper input.
Make sure that the destination device with the lowest resolution is connected to OUT 1 port to make sure video is displayed. NOTE: The splitter uses the resolution, timing information, and audio formats of the destination device with the lowest resolution for both devices.
Make sure that the HDMI cables are not broken and are securely connected.
Make sure that the audio and video formats of the content being used (i.e., Blu-ray disc) are supported by all connected devices.
Make sure that you are using high-speed HDMI cables for all connections.
Unplug the HDMI splitters AC power adapter, then plug it back in again.