KTC H25X7 Gaming Monitor Help: Set Up, Connect, Adjust, and Fix Common Problems

User manuals

Use this guide when you are setting up a KTC H25X7 gaming monitor, mounting it on a wall or monitor arm, or fixing common problems.

Quick Answers for Common KTC H25X7 Questions

The H25X7 is designed for fast-paced gaming and responsive everyday use.

Smooth motion: use up to 360Hz when your PC, cable, port, and operating system support it.
Clear Full HD picture: set your device to 1920 x 1080 for the intended image sharpness.
Flexible connection options: use HDMI 1, HDMI 2, DP 1, or DP 2.
Desk-friendly size: the 24.5-inch screen keeps fast action easy to scan.
Easy audio setup: connect headphones or speakers through the headphone/audio output jack.
Wall-mount ready: use a VESA 100 x 100 mm compatible mount.
Normal operation power consumption is listed as up to 60W; standby is listed as up to 0.5W.

What Should I Know Before Setting Up the Monitor?

Use this checklist before connecting everything:

Use the included power adapter, or one rated DC 12V / 5A.
Connect your PC or gaming console directly to the monitor for the first test.
Add docks, adapters, splitters, hubs, or extension cables only after the monitor works normally.
Use a cable and device that support the refresh rate you want.
Keep the screen protected while the monitor is face down.
Place the monitor near an easily accessible outlet.

What Comes in the KTC H25X7 Box?

Make sure you received:

LCD monitor x1
Base x1
Signal cable x1
Power adapter x1
Power cord x1
Warranty card x1
Screwdriver x1
User guide x1

If anything is missing, contact KTC support or the seller. Please include your order details, model number, and a photo of what you received.

How Should I Set Up My Desk for This Monitor?

A stable, well-ventilated setup helps the monitor stay comfortable to use and keeps the picture reliable.

Attach the Base

Lay the monitor face down on a clean, soft, flat surface.
Align the base with the mounting point on the back of the monitor.
Tighten the supplied screw with the included screwdriver.
Before standing the monitor upright, make sure the base is secure.
Lift it by holding the body and stand area. Do not lift it by the screen edge.

Place the Monitor

Place it on a stable desk or table.
Leave at least 4 inches (10 cm) of space around it for airflow.
Keep the top area open when possible. About 12 inches (30 cm) of space above the monitor is recommended.
Keep it away from heaters, direct sunlight, moisture, strong vibration, and large electrical devices that may affect the signal.
Do not cover the ventilation openings.

How Do I Connect the Monitor for the Best Picture?

Start with a direct connection. This makes it easier to confirm that the monitor, cable, and device are working correctly before you add any accessories.

Connect Power

Check the adapter label and confirm it says DC 12V / 5A.
Plug the adapter into the DC power port on the monitor.
Connect the power cord to the adapter.
Plug the power cord into a grounded wall outlet.
Keep the cable away from liquid, sharp bends, and heavy objects.
When unplugging it, hold the plug instead of pulling the cable.

Connect a PC or Gaming Console

Choose the port that matches your device and cable: HDMI 1, HDMI 2, DP 1, or DP 2.
Connect one end of the cable to your PC, laptop, or gaming console.
Connect the other end to the matching port on the monitor.
For high refresh rates, try DisplayPort (DP) first when your device supports it.
If no image appears, try another input, another cable, or another device.

The USB port is for service and maintenance only. It is not intended for regular use.

How Do I Connect Power to the KTC H25X7?

Use this section if the H25X7 will not turn on, or if you want to confirm the correct power connection before first use.

Check the adapter label and confirm it says DC 12V / 5A.
Plug the adapter into the DC power port on the monitor.
Connect the power cord to the adapter.
Plug the power cord into a grounded wall outlet.
Keep the cable away from liquid, sharp bends, and heavy objects.
When unplugging it, hold the plug instead of pulling the cable.

If the monitor still does not turn on, test the wall outlet with another device and recheck that the adapter rating matches the monitor.

How Do I Connect HDMI or DisplayPort on the H25X7?

Use this section if you want a direct HDMI or DP connection on the KTC H25X7.

Choose the port that matches your device and cable: HDMI 1, HDMI 2, DP 1, or DP 2.
Connect one end of the cable to your PC, laptop, or gaming console.
Connect the other end to the matching port on the monitor.
For high refresh rates, try DisplayPort first when your device supports it.
If no image appears, try another input, another cable, or another device.

Start with one direct cable before adding docks, adapters, splitters, or hubs.

How Do I Use Headphones or External Speakers with the Monitor?

Use this section if your headphones or speakers are connected but there is no sound, or if you want audio to pass through the monitor.

Use the monitor's audio output when your video connection also carries sound.

Connect headphones or external speakers to the headphone/audio output jack.
Use HDMI or DisplayPort (DP) when you want audio from the connected device.
If you do not hear sound, check the monitor volume, device volume, app or game volume, and selected audio output on your PC or gaming console.

How Do I Turn the KTC H25X7 On and Choose the Right Input?

Use this section if you are looking for the power button or the correct steps to turn the H25X7 on or off.

Press the joystick/power button once to turn the monitor on.
Wait a few seconds for the logo, your device screen, or a no-signal message.
If a no-signal message appears, choose the input that matches your cable.
To turn it off, press and hold the joystick/power button for about 3 seconds.
If you will not use it for a long time, turn it off and unplug the power cord.

Read the Power Light

Power light	What it means	What to do
Solid	The monitor is on and working.	No action is needed.
Flashing	The monitor is in standby or is not receiving a signal.	Check the input, cable, and connected device.
Off	The monitor is not receiving power.	Check the outlet, power adapter, and DC plug.

If the power light is on but the screen is black, open the on-screen menu. If the menu appears, the screen is working and the issue is usually the input, cable, or connected device.

How Do I Use the On-Screen Menu?

Use this section if you need to navigate the monitor menu, switch inputs, or use monitor shortcuts.

The on-screen menu lets you quickly adjust picture, audio, input, and gaming settings.

Press the joystick inward to open the menu.
Move the joystick up, down, left, or right to highlight an option.
Press the joystick inward, or move it right, to open an option or save a setting.
Move the joystick left to go back or exit.
After changing a setting, wait a moment for the picture to update.

Menu names may vary slightly by firmware version, but the joystick controls work the same way.

How Do I Use the Joystick Controls?

Use this section if you need to navigate the monitor menu, switch inputs, or use monitor shortcuts.

Direction	Shortcut before opening the menu	Action inside the menu
Up	Input source	Move up
Down	Brightness	Move down
Left	Game assist options	Go back or exit
Right	Picture preset	Open, select, or confirm

If a shortcut does not respond while the screen is black, open the on-screen menu first and check whether the monitor is in standby or no-signal mode.

How Do I Choose the Input Source on the H25X7?

Use this section if the monitor is on but the picture is not showing on the expected port.

Turn on the monitor and wait for the logo, your device screen, or a no-signal message.
If a no-signal message appears, choose the input that matches your cable.
Use the joystick Up shortcut to open input source selection when needed.
Select the matching HDMI or DP port.
If the picture still does not appear, reconnect the cable at both ends and test one direct cable.

If the power light is on but the screen is black, open the on-screen menu first. If the menu appears, the issue is usually the selected input, cable, or connected device.

How Do I Adjust Brightness and Contrast on the H25X7?

Use this section if the picture looks too dark, too bright, or uncomfortable to view.

Open the on-screen menu.
Go to the brightness, display, or picture settings.
Adjust brightness until the screen is comfortable to view.
Adjust contrast after brightness looks right.
If brightness does not seem to change, check whether HDR, night mode, a picture preset, or power saving is active on your PC, gaming console, or monitor.

How Do I Make the Picture Look Right?

Adjust the picture for your room and the way you use the monitor.

Open the on-screen menu.
Go to the brightness, display, or picture settings.
Adjust brightness until the screen is comfortable to view.
Adjust contrast after brightness looks right.
If brightness does not seem to change, check whether HDR, night mode, a picture preset, or power saving is active on your PC, gaming console, or monitor.

How Do I Set 1080p and Up to 360Hz?

For the smoothest supported experience, set the monitor to Full HD and then raise the refresh rate.

Open the display settings on your PC or gaming console.
Select the KTC H25X7.
Set the resolution to 1920 x 1080.
Set the refresh rate up to 360Hz if your device, cable, port, and operating system support it.
If the screen turns black after changing settings, wait for your device to revert automatically.
If the picture does not return, reconnect at a safe setting such as 1920 x 1080 @ 60Hz, then increase the refresh rate gradually.

How Do I Adjust the Viewing Angle?

Set the screen angle so it feels comfortable from your normal sitting position.

Hold the monitor body and stand while adjusting the screen.
Tilt the screen from -5 degrees to 15 degrees.
Avoid pressing on the panel while changing the angle.
Keep the base fully on the desk while adjusting.
Stop if the movement feels blocked or unusually tight.
After adjusting the screen, make sure the power and signal cables are not pulled tight.

How Do I Mount the H25X7 Monitor on a Wall or Monitor Arm?

Use this section if you are searching for how to mount a monitor on a wall, how to attach a monitor arm, or what VESA size the KTC H25X7 uses.

Use a compatible wall mount if you want more desk space or a cleaner setup.

Turn the monitor off and unplug all cables.
Remove the stand or base by following the installation diagram.
Use a wall mount that supports a VESA 100 x 100 mm pattern.
Use screws that match the wall mount and do not go too deep into the monitor.
If you are not sure whether the wall or bracket is suitable, ask a qualified installer to mount it.

How Do I Care for the Screen Safely?

Use this section if the screen has dust, fingerprints, or smudges, or if you need to store the product safely.

Gentle cleaning helps protect the panel surface.

Turn off and unplug the monitor before cleaning.
Wipe the screen gently with a soft, slightly damp cloth.
Do not spray liquid directly onto the screen or shell.
Do not use hard objects, strong solvents, or abrasive cleaners.
Let the monitor dry before reconnecting power.

How Do I Move or Store the Monitor Safely?

Use this section if the screen has dust, fingerprints, or smudges, or if you need to store the product safely.

Protect the screen and ports when moving or storing the monitor.

Turn the monitor off first.
Unplug cables by holding the plug, not the cable.
Store it in a dry, ventilated place.
Avoid direct sunlight, moisture, extreme temperatures, and pressure on the screen.
Keep the original packaging when possible. It helps protect your monitor during moving, returns, or repair shipping.

Troubleshooting KTC H25X7 Gaming Monitor Problems

Why Won't My KTC H25X7 Monitor Turn On?

Test the wall outlet with another device.
Reconnect the power adapter to the DC input.
Check that the adapter is rated DC 12V / 5A.
Press the power button once and wait 10 seconds.
If the power light still stays off, contact support with the adapter label, outlet test result, and current power light status.

Why Is the Power Light On but the Screen Is Black?

Press the joystick/menu button and check whether the on-screen menu appears.
If the menu appears, select the input that matches your cable.
Reconnect the signal cable at both ends.
Use one direct cable and remove adapters, hubs, docks, or splitters.
Set your device to 1920 x 1080 @ 60Hz for testing, then increase the refresh rate after the picture appears.

360Hz Is Not Available

Confirm that your device, graphics card, cable, and selected port support the refresh rate you want.
Try DisplayPort (DP) first when available.
Set the resolution to 1920 x 1080.
Update your graphics driver if you are using a PC.
Restart the device and check the refresh-rate options again.

Why Does the Image Look Blurry, Stretched, or the Wrong Size?

Set your device resolution to 1920 x 1080.
Check display scaling settings on your PC or gaming console.
Use auto adjust only when the current input supports it.
Try another cable or input port if the image remains unstable.

Why Is the Screen Too Dark?

Open the on-screen menu and increase brightness.
Check whether HDR, night mode, power saving, or a game preset is changing the picture.
Try a standard or normal picture mode for comparison.

Why Does the Monitor Feel Too Hot?

Keep at least 4 inches (10 cm) of open space around it.
Remove anything covering the ventilation openings.
Move it away from heat sources and direct sunlight.
Turn it off and let it cool if the shell feels unusually hot.

Why Is the Image Flickering, Shaking, or Distorted?

Set the refresh rate to 60Hz for testing.
Make sure the cable is fully inserted at both ends.
Use the recommended resolution and a refresh rate your device supports.
Test another cable, another input port, or another device.

Is a Brief Flash or Small Sound When Turning Off Normal?

A brief flash or a small electrical sound can happen while the monitor powers down. If it happens often with odor, unusual heat, or failure to turn on, stop using it and contact support.

Frequently Asked Questions