Sony STR-AN1000 Help Manual page 317

Help Guide
Multi Channel AV Receiver/Multi Channel AV Amplifier
STR-AN1000/TA-AN1000
No sound is output to the TV from the connected HDMI device when the unit is in standby
mode.
When the unit enters standby mode, the image or sound from the last HDMI device selected before you turned off the unit
is output. If no sound is output from the TV when the unit is in standby mode, perform the following operations.
Turn on the unit to select the HDMI device from which you want to play.
Make sure [Standby Through] is set to [Auto] or [On] in the [HDMI Settings] menu.
Related Topic
Enjoying content of a connected device without turning on the unit (Standby Through)
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