What causes Check Signal Cable errors on Samsung displays

The “Check Signal Cable” error on Samsung monitors and TVs indicates that the display is not receiving a video signal from the connected device. This is usually a connectivity issue, not a monitor failure.

Primary Causes

1. Faulty or Loose Cables

  • Bad cables might be the cause of the error

  • Loose connections prevent proper signal transmission

  • Bent pins in HDMI ports can prevent proper signal transmission

  • Frayed wires or loose connectors cause intermittent or no signal problems

2. Wrong Input Source Selected

  • Selecting the wrong input source on the monitor triggers the error

  • The TV doesn’t detect a device connected to the selected input

3. Connected Device Not Sending Signal

  • The connected device (PC, gaming console, streaming player) is not sending a signal

  • The source device may be turned off or in sleep mode

  • Mismatched settings on the source device lead to no signal errors

4. Graphics Card or Driver Issues

  • Incorrect graphics card connection: Monitor plugged into integrated graphics instead of dedicated GPU

  • Outdated graphics drivers from Nvidia, AMD, or Intel

  • Display port adapter failures cause signal drops

5. Hardware Problems

  • Defective graphics card/chip

  • Internal component failure in the monitor

  • Monitor set to monitor mode on All-in-One computers

Quick Reference Table

Cause Category Specific Issue Solution
Cables Faulty, loose, damaged Reseat or replace cable
Input Wrong source selected Select correct HDMI/DP input
Source Device Not sending signal Check device power & display settings
Graphics Connected to wrong port Connect to dedicated GPU, not integrated
Drivers Outdated drivers Update from Nvidia/AMD/Intel
Hardware Bent pins, component failure Contact Samsung support

The error message is generated within the monitor itself—it has detected that the cable is connected but there is no signal.