Extenders are an indispensable accessory for KVM switches and play a vital role in the entire KVM system. When faults occur in a KVM switch system, most network administrators tend to focus only on the switch unit itself while overlooking KVM cables and extenders. Below is a summary of common faults for KVM extenders for your reference. We apologize if any issues are missing. For technical assistance, please contact VOELLS KVM technical support at 400-6360-586.

Fault 1: Local keyboard and mouse work, but remote ones do not

Root Causes

1. Poor Ethernet cable connection or incorrect crimp pinout order

2. Loose connection of remote keyboard and mouse

3. Failure to press the switch button

Solutions

1. Reconnect the Ethernet cable or re-crimp the RJ45 connector

2. Re-plug the remote keyboard and mouse, then restart the receiver

3. Toggle signal channels via the switch button

Fault 2: Neither local nor remote keyboard and mouse function

Root Causes

1. Loose cables connecting the host PC to the transmitter

2. Windows XP system may disable relevant communication ports

3. Incompatibility with the motherboard’s PS/2 protocol

Solutions

1. Inspect all cables linking the host and transmitter

2. Reboot the host computer

3. Connect via a USB-to-PS/2 adapter to the motherboard USB port

Fault 3: Remote keyboard and mouse work, but local ones do not

Root Causes

1. Loose connection of local keyboard and mouse

2. Incompatible local keyboard and mouse model

3. Failure to press the switch button

Solutions

1. Unplug and reinsert the local keyboard and mouse

2. Replace local peripherals with the same keyboard and mouse model used on the remote end

3. Toggle signal channels via the switch button

Fault 4: Severe color distortion of VGA video signal

Root Causes

1. Loose VGA port connection

2. Poor contact at the Ethernet port

3. Improperly crimped Ethernet cable heads

Solutions

1. Thoroughly check all VGA port connections

2. Inspect Ethernet ports for looseness

3. Re-crimp RJ45 connectors with professional crimping tools

Fault 5: Severe RGB color separation on VGA display

Root Causes

1. Poorly crimped Ethernet cable connectors

2. Low-grade Ethernet cable with excessive wire length mismatch

Solutions

1. Re-crimp the cable using high-quality crimping tools

2. Replace with premium standard Ethernet cables during procurement

Fault 6: Video signal displays on the local end, no signal on the remote end

Root Causes

1. Disconnected Ethernet cable

2. Broken internal wires inside the Ethernet cable

Solutions

1. Reinstall the cable and verify correct pinout sequence

2. Test cable integrity with a cable tester; replace damaged cables

Fault 7: No video signal on both local and remote terminals

Root Causes

1. Disconnected cables between the local transmitter and host PC

Solutions

1. Fully inspect all connection cables running to the host

Fault 8: Severe image ghosting and smearing (within the product’s rated transmission distance)

Root Causes

1. Failure to adjust the equalization control knob

2. Bad contact caused by improperly crimped RJ45 plugs

3. Low-quality Ethernet cable leading to heavy signal attenuation

Solutions

1. Adjust the remote-end equalization knob with a small screwdriver

2. Re-crimp RJ45 connectors with professional tools

3. Replace with high-grade Ethernet cable