KTC H25N7 / 25M1 Gaming Monitor Help: Setup, Shielding Hood, and 400Hz

Set up your KTC 25M1 (H25N7), attach the light shields, connect a PC, and choose the right refresh rate. This guide also covers common display problems.

Quick Answers for the H25N7 / 25M1

  • The 24.1-inch display's native resolution is 1920 x 1080.
  • At 1920 x 1080, the monitor supports up to 400Hz through DisplayPort 1.4 and up to 240Hz through HDMI 2.0.
  • The box includes two light shields and a wired controller with a Mini-USB connection.
  • Before replacing the power adapter, match the rating printed on the monitor and its original power equipment.

What Comes in the Box?

The box includes the monitor, base, DP signal cable, power cord and power equipment, user guide with warranty card, two light shields, and wired controller. Check the contents before assembly. If anything is missing, contact our support team with your order details and a photo of the package.

How Do I Install the Base and Light Shields?

  1. Turn the monitor off and lay it face down on a clean, soft, flat surface.
  2. Align the base with the stand and check that it locks before lifting the display.
  3. Align the tabs on each light shield with the matching slots at the rear of the monitor.
  4. Press each shield into place gently; do not force a tab or press on the panel.
  5. Lift the monitor by its body and stand and put it on a stable desk.

Keep the assembly instructions available if you later remove the base or shields.

How Do I Connect the Monitor and Set 400Hz?

  1. Connect the supplied power equipment and one direct DP cable from a compatible graphics output to a DP 1.4 input.
  2. Turn on the PC and monitor; choose the connected input with the monitor's input shortcut or menu.
  3. Set the PC to 1920 x 1080, then select a supported refresh rate up to 400Hz in the operating system or graphics control panel.
  4. If the image is unstable, start at 1920 x 1080 @ 60Hz and raise the refresh rate in steps.

The monitor has two DP 1.4 and two HDMI 2.0 inputs. HDMI supports up to 1920 x 1080 @ 240Hz; use DP for 400Hz. The source device, cable, and selected input must also support the chosen rate.

How Do I Use the Menu and Wired Controller?

Use the monitor's control to open the menu and select an input, gaming assistance option, or scene mode. The supplied wired controller connects through Mini-USB and offers quick mode-selection buttons. Check the on-screen mode before gaming.

Where Should I Place and Clean the Monitor?

Keep the monitor's vents uncovered, use a stable desk, and avoid heat, moisture, strong vibration, and direct airflow from an air conditioner. Turn off and unplug the monitor before cleaning; wipe the screen gently with a soft, slightly damp cloth, without spraying liquid on the panel.

Troubleshooting H25N7 Problems

The monitor does not turn on

Check the wall outlet and both ends of the supplied power connection, then use the monitor's power control. If you need replacement power equipment, match the unit's nameplate and contact our support team rather than guessing from a web specification.

The power light is on, but there is no picture

Choose the input matching your cable, reseat both ends, and test one direct connection at 1920 x 1080 @ 60Hz. Try another cable or source device if available.

The PC does not offer 400Hz

Confirm that you selected 1920 x 1080 and a DP 1.4 input. Check the graphics output, DP cable, operating-system display settings, and driver. HDMI supports up to 240Hz at 1080p.

The image flickers or looks distorted

Lower the refresh rate for testing, reconnect the cable, and remove any dock, adapter, or splitter. Raise the setting again only after the image is stable.

Frequently Asked Questions

Does HDMI support the full 400Hz mode?

No. HDMI 2.0 supports up to 1920 x 1080 @ 240Hz; DP 1.4 supports up to 1920 x 1080 @ 400Hz. Select DP and verify the PC's display settings for 400Hz.

Do I have to install the light shields?

The supplied shields help block side light. Fit them if useful for your setup, and check that they do not cover the monitor's vents.

What if the wired controller is not responding?

Check its Mini-USB connection and confirm the monitor is powered on. Use the monitor's own control to verify the current input and picture mode.