The AT-UHD-SYNC 4K HDMI Emulator/Tester from Atlona is designed to analyze errors, identify issues, and restore failed HDMI signals. It also provides a pre-set or learned EDID to an HDMI source, ensuring the HDMI source provides a signal optimized for the display to achieve the best picture and sound. The AT-UHD-SYNC is used by installing it into the HDMI signal path between the source and switcher or between source and display if no switcher is present. The device provides an HDMI input and output on the rear panel for these connections. To test and analyze the HDMI connection, the AT-UHD-SYNC is equipped with three LEDs which indicate the presence and state of 5V, hot plug detect, and HDCP signals, helping the installer isolate the cause of a connection failure. It resolves issues that cause costly and time-consuming troubleshooting calls, such as loss of signal, intermittent or flashing video, snow, and color space incompatibility where the image is tinted purple or green.