Dual/Triple Monitor KVM Switch Monitor Flickering/No Display Troubleshooting

This article description provides general troubleshooting advice, for more specific guidance please review the detailed troubleshooting step guide linked at the bottom of this article. If the problem persists, please contact the TESmart Customer Service Center through the chat window on the lower right or submit feedback. Our professional team is always ready to 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)/HKS802-E23 (Previously HKS0802A1U/
DKS802-E23 (Previously PKS0802A10)/HKS0403A1U etc.

This article includes the following topics:

The following are some troubleshooting factors and specific operation suggestions in such cases:

Cable Issue:

Cable Itself: Although this is relatively rare, it cannot be ignored as a possible cause of signal connection failure. Please make sure all connections have been inserted securely and tight enough.
  • Ensure that all cable connectors are intact and have been inserted into the corresponding ports.
  • Ensure that all cables have been connected tightly against any possible looseness or disconnection.
Cable Function: Please try following troubleshooting steps:
  • Bypassing the KVM Switch, directly connect the PC and monitor with the cable provided. (If multiple PCs or monitors are involved, please perform such a direct connection test with each device.)
  • To check if the monitor can display properly without any abnormal situation.

If the cable issue can be eliminated, please move to the next troubleshooting section.

Port Issue on PC or KVM:

PC End Troubleshooting Test: If available, please replace it with another PC to connect to the KVM and observe if the problem persists.

  • Ensure in advance that the newly connected PC is reliable and working properly.
  • To check if the monitor can display normally to determine if it is a PC-related issue.

KVM End Troubleshooting Test: Using a work PC, connect to every other input port on the KVM and confirm if other input ports can function normally.

  • Connect a known work PC to each input port on the KVM and observe if the monitor displays properly when the PC is connected to each port.

  • If the problem occurs when connecting only to the original port, but connecting to all other ports works fine, it may indicate a faulty KVM input port.

Troubleshoot the factors mentioned to identify if the issue lies with the PC or the KVM Switch input port. This helps pinpoint the problem accurately for effective resolution.

Resolution Issue:

Adjust the resolution settings:
  • Open the PC's Display Settings or Graphics Driver settings;
  • Adjust the resolution of the problem monitor to the same as other normal working monitor(s);
  • Make sure that the newly selected resolution is within the supported resolution range of the KVM switch;
  • Save the changes and reboot the PC to make the new resolution setting take effect;
  • Observe if the monitor can display normally now.

Adjust the resolution settings to ensure compatibility with the KVM Switch and troubleshoot display issues. If the problem persists, examine other factors like Graphics Driver or monitor settings.

Converter Devices/Cables Issue

Docking Station Issue: Especially in situations where multiple monitors have video problems when switching to the same PC

Adapter/Converter/Converter Cable Issue: Especially in situations where a certain monitor has video problems when switching to a certain PC

Check the signal transmission direction of the converter: With the exception of DVI-HDMI converter cables, which are available in both transmission direction setups, other types are unidirectional in nature and cannot be used in reverse.

Troubleshooting Tests:

  • If a dock station is used in connection and the situation is that both(all) monitors have video problems when switching to the same PC, please try to remove other input devices, connect the PC to the KVM without using a docking station but an input cable ONLY, and connect a monitor to the KVM, check if the monitor can display normally at this time, and then exchange to another monitor to the KVM and observe if this monitor can also display normally.
  • If you are using a multi-monitor KVM, and the situation is that only one of the monitors connected has video problems. In the input end connection, one of the inputs can be displayed normally without the use of a conversion device, but when another input is connected to the KVM with a conversion device, the direct-connected input can not be displayed properly with flickering or no image issue at this time. In such a case, please try to remove the input connection with a conversion device to confirm whether the normal display can be restored.
  • Keep the connection with the converter device and cables involved at the PC side, bypassing the KVM switch, connect the PC with the connection to the problem monitor, and observe if the monitor can display normally now.

Check here to confirm if the docking station, converter devices, or cables are the issue. If problems persist, consider compatibility with the KVM switch. Contact TESmart Customer Service with the dock/converter's model or purchase link for verification.

Monitor Settings Issue

Checking the monitor menu or pressing the physical buttons, make sure that the currently selected input source for the monitor is the PC connected to the KVM switch.

For more detailed troubleshooting steps towards the video issue, please access the following link: Detailed Troubleshooting Steps

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.



Was this article helpful?
0 out of 24 found this helpful



Please sign in to leave a comment.

Have more questions?
Submit a request
Share it, if you like it.