Symptom

Microsoft Teams Rooms (MTR) has a blank screen, does not respond, or react both the touch display and external HDMI monitor when:

• An HDMI external monitor is connected to a ThinkSmart device.
• The ThinkSmart device has a blank or black screen.
• The ThinkSmart device is not used for an extended period of time.
• The user taps on Microsoft Teams Rooms (MTR) on the ThinkSmart device touch display, however the ThinkSmart device does not respond.

ThinkSmart Device touch display (ThinkSmart Hub display, ThinkSmart Controller, IP Controller)	HDMI External Monitor

Applicable Devices

• ThinkSmart Core with Microsoft Teams Rooms
• ThinkSmart One with Microsoft Teams Rooms
• ThinkSmart Edition Tiny M920q (10T1) with Microsoft Teams Room
• ThinkSmart Hub with Microsoft Teams Rooms
• ThinkSmart Hub 500 with Microsoft Teams Rooms

Operating Systems

• Windows 10 IoT
• Windows 11 IoT

Solution

Try to following:

1. Restart the ThinkSmart device. If issue persists:
2. Update the HDMI external monitor software, firmware or drivers to the latest version. If the issue persists:
3. Connect a HDMI EDID Emulator, that supports 1920x1080p resolutions, between the ThinkSmart device and the HDMI external monitor.
       

Additional Information

This is a Microsoft Teams Rooms known issue. Refer to the following:

• [Microsoft] Teams Rooms device's displays show a black or blank screen
• [Mircosoft] Microsoft Teams: Known issues in Teams Rooms and Devices - Expected behavior. The issue can be caused by one of the following:
  • Inconsistent implementation of standby modes.
  • Active video source selection.
  • Incorrect EDID information that's communicated to the Microsoft Teams Rooms device.

[Microsoft] Microsoft Teams: Known issues in Teams Rooms and Devices - Expected behavior has more information about EDID Emulator's.

Related Articles

• Microsoft Teams Rooms
• ​Microsoft Teams Rooms Help
• Microsoft Teams Release Notes