Dual/Triple Monitor KVM Switch all black screens

If you're encountering problems where none of the external monitors connected to your TESmart KVM switch are displaying (showing a black screen), we suggest trying the following troubleshooting steps. If the issue persists, please reach out to the TESmart Customer Service Center for further assistance. You can contact us through the chat window at the lower right or by submitting feedback. Our dedicated team of professionals is ready to help and provide after-sales support.

Applicable product models: Dual/Triple Monitor KVM Switch

HKS202-E23 (Previously HKS0402A1U)/HDK202-E23 (Previously HDK0402A1U)/
HKS202-P23 (Previously HKS0202A2U)/HKS402-P23 (Previously HKS0402A2U)/
HKV202-E23 (Previously HKV0402A1U)/HKS402-E23 (Previously HKS0802A1U/
DKS402-E23 (Previously PKS0802A10)/HKS0403A1U etc.

This article includes the following topics:

We provide detailed troubleshooting steps below for the situation where all monitors display black screens. Please refer to the following suggestions for assistance:

Input and output issues, docking station compatibility, and cable problems:

Please try connecting the problematic monitor directly to the computer (bypassing the KVM) and check if the issue persists. If the monitor still doesn't work, it suggests that the problem may lie with the source, monitor, cable, or docking station. It's important to keep the original cable or connected converter unchanged during this testing process.

Check for monitor recognition issues:

If the correct monitor name cannot be identified, it indicates a connection problem with the product. We recommend reaching out to TESmart customer support directly.
Note: Steps to check display recognition:
"Settings" -> "System" -> "Display" -> "Advanced Display Settings" -> then click on the drop-down arrow symbol. Providing a screenshot of this page would be very helpful.

Docking station/adapter issues:

Have you used any adapters or docking stations to connect the computer and monitors to the KVM switch? If so, check the signal direction of the adapters or try using a different adapter. The correct signal transfer direction is from the computer to the KVM switch and then to the monitor. For example, if the input source port is USB-C and the KVM port is HDMI, the appropriate converter to use is USB-C to HDMI, not HDMI to USB-C.(If all external monitors can display normally when directly connected (bypassing the KVM switch), please proceed to the next troubleshooting step.)

For more information on docking stations, click on the docking station

Resolution of the monitor:

For more information on the resolution of the monitor, click on the resolution of the monitor

Final cross-experimentation method:

The aim is to determine the root cause of the issue, whether it is with the computer's output port, the connection cable, or the KVM switch port.

For more information about cross-testing, please click on the cross-testing

If all of the steps above cannot help you locate and resolve the problem, please contact TESmart Customer Support for further assistance. Briefly mention the steps that you’ve already tried for a faster solution.

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