Dual/Triple Monitor KVM Switch Only one monitor can display

If you are experiencing a problem that one of the external monitors connected to the TESmart KVM switch displays a black screen, please try 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 always ready to help and provide after-sales support.

Applicable product models: Dual Monitor KVM; Triple Monitor KVM
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:

To troubleshoot the issue of a black screen on one monitor, please follow the steps below. The goal is to determine if the problem lies with the output port on the computer, the output port on the monitor, the cable, or the KVM switch port.

Firstly, how can we determine whether the issue lies with any input/output port, cable, or docking station?

Try connecting the black-screen monitor directly to the computer (bypassing the KVM) to check if the problem persists. If there's an image, it indicates the issue is not related to these devices. If the monitor still lacks an image, it suggests a potential issue with these devices. It's crucial to keep the original cable or connected converter unchanged during this testing process.

Direct Connection Test.JPEG

Secondly, how to determine whether the issue lies with the part connecting to the KVM including KVM ports, and input/output cables?

Please take the following cross-testing methods to troubleshoot specific problems.

1. If all input sources have a black screen on the same monitor.

above all, please make sure all the cables have been connected properly to the KVM

HDMI+DP.JPEG

These troubleshooting steps aim to pinpoint issues with the Output connection, including the KVM switch's output port and cable.

STEP1.Please exchange connection ports which the monitors connected to the KVM ONLY(keep the location of the monitor and cables unchanged )Cross testing is shown in the figure.

The product model in the picture is HKS0402A1U as an example

Before: Assume that before the crossover experiment, Monitor1 shows a black monitor and Monitor2 is a working monitor.

Monitor1 ---> Display1 output ---> (black screen)

Monitor2--->Display2 output---> (working monitor)

Exchange the connect port only.JPEG

Cross test product output interface.jpg

STEP2. keep the connection status completed in STEP 1. Please exchange the cables connecting the display and the KVM(Keep the monitor and KVM output ports unchanged )Cross testing as shown in the figure.

Before: Assuming that before conducting the cross-experiment, Monitor1 shows a black monitor, Monitor2 is the working monitor.

Monitor1---> Display1 output--->(Black monitor)

Monitor2--->Display2 output---> (The working monitor )

Exchange the cables only.jpg

Cross test product output cable.jpg

 

These troubleshooting steps are designed to pinpoint problems with the output connections, including the KVM switch's input ports and input cables.

2. If All input sources have a display with a black screen, but it is not the same display.

Confirm that in dual-screen mode, input A corresponds to Display 1, and input B corresponds to Display 2

STEP1.Please exchange the position of the KVM port where the input source is connected,

(Keep the computer and cables unchanged.) Cross testing is shown in the figure.

Before: Assuming that before conducting the cross-experiment, Monitor1 shows a black monitor, Monitor2 is the working monitor.

PC1---> PC1 input--->(Black monitor)

PC2--->PC2 input---> (The working monitor)

Exchange the connection port on switch only.jpg

Cross test product input interface.jpg

STEP2.maintain the connection state completed in STEP 1. Please exchange the input cable connecting the computer to the KVM,

(Keep the computer and KVM input ports unchanged.) Cross testing is shown in the figure.

Before: Assuming that before conducting the cross-experiment, Monitor1 shows a black monitor, Monitor2 is the working monitor.

PC1---> PC1 input--->(Black monitor)

PC2--->PC2 output---> (The working monitor )

Exchange the cables only-2.jpg

Cross testing KVM switch input cables.jpg


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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