Sony STR-ZA810ES Manual page 191

When the receiver enters standby mode, the image from the last HDMI device selected
before you turned off the receiver is displayed. If you are enjoying content from another
device, play the content on the device and perform the One-Touch Play operation, or turn on
the receiver to select the HDMI device from which you want to enjoy content.
Make sure [Standby Through] is set to [On] or [Auto] in the [HDMI Settings] menu.
[238] Troubleshooting
The home menu does not appear on the TV screen.
The home menu can only be used when you connect the TV to an HDMI OUT jack.
When you want to display the menu on the TV screen connected to the HDMI OUT B/HDMI
ZONE jack, set [HDMI Out B Mode] to [Main].
Press HOME to display the home menu.
Check that the TV is connected correctly.
Disconnect the HDMI cable from the receiver and TV and then reconnect the cable.
Check that the appropriate input is selected on the TV.
Select the HDMI input to which the receiver is connected.
The home menu may take some time to appear on the TV screen depending on the TV.
[239] Troubleshooting
HDR (High Dynamic Range) images cannot be
displayed in HDR mode.
Depending on the TV or video equipment, HDR images may not be displayed in HDR mode.
Check the video capability and setting of your TV or video equipment.
Some video equipment may not output HDR contents in HDR mode if [HDMI Signal Format]
is set to [Standard format], even if both TV and video equipment support HDR and 18 Gbps
band width. In this case, set [HDMI Signal Format] of selected input to [Enhanced format] in
the [HDMI Settings] menu. When you select [Enhanced format], use Premium High Speed
HDMI cables with Ethernet which can support bandwidth up to 18 Gbps.
When you connect two Dolby Vision-compatible TVs to the receiver and select [HDMI A+B],
Dolby Vision content is output in the HDR10 or SDR (Standard Dynamic Range) format. To
enjoy Dolby Vision content as it is, connect only one Dolby Vision-compatible TV to the
receiver, or select either [HDMI A] or [HDMI B].
[240] Troubleshooting
Display does not appear on the display panel.
If the PURE DIRECT indicator on the front panel lights up, press PURE DIRECT to turn off
this function.
Press DIMMER on the receiver to select [BRIGHT] or [DARK].
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