HKS0401A30 3/4 USB Port not working
Hello,
My KVM HKS0401A30 is working well before. However, I recently encountered a problem of 3 out of 4 USB ports are not working while the HDMI ports are working fine.
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Hdmi1 : OK
USB1 : Not work
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Hdmi2 : OK
USB2 : Not work
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Hdmi3 : OK
USB3 : Working
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Hdmi4 : OK
USB4 : Not work
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I want to tryout the firmware update fix.
Would you please provide me the firmware and let me know how to do so. Thanks!
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正式なコメント
Dear Gary Kam,
Thank you for reaching out and providing the detailed information.
From your description, all four HDMI channels are working normally, but only USB port 3 is functioning while USB ports 1, 2, and 4 are not. This behavior may be caused by a firmware error, a faulty USB upstream connection, or a partial failure of the USB control chip.
Before proceeding with a firmware update, please try the following steps to confirm the issue:
1. Power cycle the KVM
Disconnect all HDMI and USB cables.
Unplug the power adapter for about 1–2 minutes.
Then reconnect the power supply and cables, and test again.2. Check the power adapter
Make sure the KVM uses the original power adapter.
Unstable or insufficient power can cause USB ports to malfunction.3. Test each USB upstream (Type-B) port
Each input channel (1–4) has a USB Type-B upstream port that connects to your computer.
Please use a known-good USB-B to USB-A cable to connect each port to your computer one at a time.
When connected, check if the KVM’s HID device is detected by your system (on Windows: Device Manager → Interface Devices; on macOS: System Information → USB).
Then connect your keyboard and mouse to the KVM’s USB Type-A ports (front panel) and test if they respond correctly.4. Swap cables and channels
Swap the USB-B cables between channels (for example, connect your working cable from channel 3 to channel 1).
If the issue follows the cable, it may be a cable or computer-side problem.
If the issue stays with the same channel, it is likely a KVM hardware or firmware issue.If possible, please send us your purchase invoice as well — it’ll help us confirm your order details and speed up the support process.
Looking forward to your reply.
Best regards,
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Hello,
I had tested the USB upstream (Type-B) port and the result is as follow
USB1: No additional Interface device detected by Device Manager
USB2: No additional Interface device detected by Device Manager
USB3: I saw additional Interface device detected by Device Manager
USB4: No additional Interface device detected by Device Manager
Best Regards,
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Dear Gary Kam,
Thank you for your prompt reply and for performing the detailed troubleshooting steps. Based on the results you provided, it appears that the USB-B ports on your KVM may be physically damaged.
As one of our valued customers, we truly appreciate your continued support. To express our gratitude, we are pleased to offer you a special discount on a replacement or new purchase should you wish to repurchase.
Please let us know if you would like to take advantage of this offer, and we will provide the details to make the process as smooth as possible.
Thank you again for your patience and understanding. We look forward to assisting you further.
Best regards,
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Hello, I want to tryout the firmware flashing first.
If the firmware flashing unable to fix it , I would consider to buy a new one.
Thanks for your understanding,
Best Regards,
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Dear Gary Kam,
Thank you for your reply.
After reviewing the results you provided, it appears that the USB-B port on your KVM switch is no longer functioning properly. This issue is usually caused by physical damage or an internal hardware fault on the USB interface chip.
Common reasons include:
1. Electrostatic discharge (ESD) or power surges, which can damage the USB controller circuit.2. In rare cases, overcurrent or short circuits from connected USB devices may lead to permanent port failure.
Since the HDMI video switching is still working correctly, this confirms that the KVM’s main processor is intact, and only the USB data channel is affected. Unfortunately, this kind of hardware fault cannot be fixed by firmware update.
Please let us know your purchase invoice or order number so we can assist you further.
Best regards,
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Hello,
Order number: 103030586776470760
Please send me more details regarding the discount offer. Thanks!
Best Regards,
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Dear Gary Kam,
Thank you for your reply.
Please kindly submit a support ticket to contact our after-sales service team, will provide a repurchase discount for you.We truly appreciate your support and understanding.
Best regards,
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