KTC H27S5 Gaming Monitor Help: Setup, Dual Display Modes, and Troubleshooting

Set up your KTC H27S5, connect a PC or console, and choose between its native 1440p mode and high-speed 720p DLG mode. This guide also covers picture settings and common display problems.

Quick Answers for the KTC H27S5

• The native display setting is 2560 x 1440, with up to 200Hz through DisplayPort 1.4 or 144Hz through HDMI 2.0.
• The high-speed DLG mode is 1280 x 720 @ 400Hz through a compatible HDMI or DisplayPort connection. It uses a lower resolution than the native 1440p mode.
• The monitor has two HDMI 2.0 inputs, two DisplayPort 1.4 inputs, and a headphone output.
• Use the supplied power adapter or check the rating printed on your own unit before replacing it.
• The rear mount uses a 100 x 100 mm VESA pattern. Check the monitor and bracket before choosing screws.

What Comes in the H27S5 Box?

The box includes the display, base, power cord, power adapter, DP signal cable, and a user guide with warranty card. Some packages may also include a screwdriver and mounting screws. Check the contents before assembly, and contact our support team if anything expected for your package is missing.

How Do I Assemble the Base?

1. Turn the display off and disconnect its cables.
2. Place it face down on a clean, soft, flat surface without pressing on the panel.
3. Attach the base to the stand, then connect the stand to the rear mounting point.
4. Check that the attachment is locked before lifting the display.
5. Lift by the monitor body and stand, then set it on a stable, level desk.

If the parts do not align easily, check their orientation against the diagram instead of forcing them together.

Where Should I Place the Monitor?

Leave about 10 cm of open space at the sides and back and 30 cm above the display. Keep the vents uncovered and avoid placing the monitor inside a tight cabinet. Keep it away from moisture, direct heat, strong vibration, and direct airflow from an air conditioner.

How Do I Connect a PC or Console?

1. Connect the supplied power equipment to the monitor and an accessible outlet.
2. Connect one direct HDMI or DisplayPort cable between the source device and the matching monitor input.
3. Turn on the source and the monitor.
4. Move the joystick up to open the input shortcut, or open the on-screen menu and select the input that matches your cable.
5. If the picture does not appear, try 1920 x 1080 @ 60Hz on the source device before raising the display setting.

For initial troubleshooting, remove docks, adapters, splitters, and extension cables from the signal path.

How Do I Set 1440p at Up to 200Hz?

1. Connect a compatible DisplayPort output directly to one of the monitor's DP 1.4 inputs.
2. In the operating system or graphics control panel, select the H27S5 and set 2560 x 1440.
3. Select a supported refresh rate, increasing it to 200Hz when your graphics output and cable support that mode.
4. If the screen becomes blank or unstable, return to 2560 x 1440 @ 60Hz and test a lower refresh rate first.

HDMI 2.0 supports up to 2560 x 1440 @ 144Hz. Use DP for 1440p at 200Hz.

How Do I Use the 400Hz DLG Mode?

The 400Hz DLG mode uses 1280 x 720 through a compatible HDMI or DP connection. Select that resolution and then choose 400Hz in your source device's display settings if it appears. If it is unavailable, confirm that the graphics output, cable, selected port, and operating system all expose the mode. Return to 2560 x 1440 when you want the monitor's native resolution and sharper desktop image.

How Do I Use the Joystick and Picture Menu?

Use these joystick shortcuts before opening the main menu:

Inside the menu, up and down move through items, left goes back, and right opens or selects an option. If the picture is too dark, adjust brightness and contrast in the display menu, then check the PC's HDR or picture settings.

How Do I Mount the H27S5 on an Arm or Wall Bracket?

Turn off and unplug the monitor, place it face down on a protected surface, and release the stand. Use a bracket with a 100 x 100 mm VESA pattern that can support the monitor. Confirm the correct screw length against the monitor and bracket before tightening; do not force a screw into the rear housing.

How Do I Clean the Display?

Turn off and unplug the monitor. Wipe the panel gently with a soft, slightly damp cloth. Do not spray liquid onto the screen, press it with hard objects, or block the ventilation openings.

Troubleshooting H27S5 Display Problems

The power indicator is off

Check the outlet, reconnect the supplied power adapter at both ends, and short-press the joystick. If you need a replacement adapter, use the rating on the unit's nameplate.

The power indicator is on, but there is no picture

Open the on-screen menu to confirm the monitor is on. Select the input matching the connected cable, reconnect both cable ends, and test one direct connection at 1920 x 1080 @ 60Hz. Try another cable, input, or source device if available.

200Hz or 400Hz is missing

Check the selected resolution first: 2560 x 1440 for up to 200Hz through DP, or 1280 x 720 for the 400Hz DLG mode. Then check the input port, cable, graphics output, and operating-system refresh-rate menu. Reduce the rate if the picture flashes or loses signal.

The picture is dark, distorted, or flickering

For a dark image, open the display menu and adjust brightness and contrast. For flicker or distortion, return to 60Hz, reconnect the cable, and raise the refresh rate in steps after the picture is stable.

Frequently Asked Questions

Is 400Hz available at the monitor's native 1440p resolution?

No. The 400Hz DLG mode uses 1280 x 720. At 1440p, the H27S5 supports up to 200Hz through DP or 144Hz through HDMI.

Can I use headphones through the monitor?

Yes. Connect headphones or powered speakers to the monitor's headphone output, then confirm that your PC or console sends audio over the active display connection and that the source volume is on.

Which input should I choose when the screen is blank?

Select the HDMI or DP input that matches your physical cable. If the menu appears but the image does not, test a direct cable at 1920 x 1080 @ 60Hz before returning to a high-refresh setting.