Introduction
This manual provides essential information for the safe and efficient operation of your Prechen 23.8 Inch 144Hz Frameless Gaming Monitor, Model HD-238. Please read this manual thoroughly before using the product and retain it for future reference.
Important Safety Information
Observe the following safety precautions to prevent damage to the monitor and ensure your safety:
- Do not expose the monitor to rain or moisture to avoid fire or electric shock hazards.
- Do not open the monitor casing. There are no user-serviceable parts inside. Refer all servicing to qualified service personnel.
- Place the monitor on a stable, flat surface to prevent it from falling.
- Ensure proper ventilation around the monitor. Do not block ventilation openings.
- Use only the power adapter supplied with the monitor.
- Disconnect the power cable from the outlet during lightning storms or when unused for long periods.
- Avoid placing heavy objects on the power cord.
- Keep the monitor away from direct sunlight, heat sources, and extreme temperatures.
Package Contents
Please check the package contents upon unpacking. If any items are missing or damaged, contact your retailer.
- Prechen 23.8 Inch Monitor
- Monitor Stand (Base and Neck)
- Power Adapter
- Power Cable
- HDMI Cable
- DisplayPort Cable
- User Manual
Product Overview

Figure 1: Front view of the Prechen 23.8 Inch Gaming Monitor, showcasing its frameless design and display area.

Figure 2: Rear view of the monitor, showing the VESA mount area and ventilation slots.
Rear Panel Ports

Figure 3: Illustration of the monitor's rear panel, detailing the available ports and VESA mounting points. The dimensions for VESA mounting are 75mm x 75mm.
- DP Port: DisplayPort input (Up to 144Hz refresh rate).
- HDMI Port: HDMI input (Up to 144Hz refresh rate).
- Audio In: 3.5mm audio input jack.
- USB Port: USB input (for data or peripheral connection, specific functionality not detailed).
- DC Port: Power input for the DC adapter.
Setup Instructions
1. Assembling the Stand
- Carefully remove the monitor from its packaging, keeping it protected on a soft surface.
- Attach the stand neck to the monitor's rear panel. Ensure it clicks securely into place or is fastened with screws if provided.
- Attach the stand base to the stand neck, securing it with the thumb screw or screws from underneath.
- Place the assembled monitor on a stable, flat desk.
Alternatively, for VESA mounting: The monitor supports 75mm x 75mm VESA mounts. Remove the stand and attach a compatible VESA bracket (not included) to the monitor's rear panel.
2. Connecting to a Computer
Choose one of the following connection methods:
- DisplayPort Connection: Connect one end of the DisplayPort cable to the DP port on your monitor and the other end to the DisplayPort output on your computer's graphics card. This connection supports up to 144Hz refresh rate.
- HDMI Connection: Connect one end of the HDMI cable to the HDMI port on your monitor and the other end to the HDMI output on your computer's graphics card. This connection also supports up to 144Hz refresh rate.
Note: Ensure your graphics card supports the desired resolution and refresh rate for optimal performance.
3. Connecting Power
- Connect the power adapter to the DC port on the monitor.
- Plug the power cable into the power adapter.
- Plug the other end of the power cable into a grounded electrical outlet.
Operating Instructions
Power On/Off
Press the power button, usually located on the rear or bottom right of the monitor, to turn the monitor on or off. The power indicator light will illuminate when the monitor is on.
On-Screen Display (OSD) Menu
The OSD menu allows you to adjust various monitor settings. The control buttons are typically located on the rear or bottom right of the monitor.
- Press the OSD menu button to open the menu.
- Use the navigation buttons (up/down/left/right) to browse through menu options.
- Press the select/enter button to confirm a selection or enter a sub-menu.
- Press the exit button to close the OSD menu or go back to the previous level.
Key OSD Settings
- Brightness/Contrast: Adjust the overall luminance and contrast ratio of the display.
- Color Settings: Modify color temperature, gamma, and individual RGB levels.
- Input Select: Manually switch between DisplayPort and HDMI inputs.
- Refresh Rate: Ensure your monitor is set to 144Hz in both the OSD and your computer's display settings for optimal gaming performance.
- AMD FreeSync: Enable this feature in the OSD menu and your AMD graphics card settings to synchronize the monitor's refresh rate with the GPU's frame rate, reducing screen tearing and stuttering.
- Low-Blue Light: Activate this mode to reduce blue light emissions, which can help alleviate eye strain during prolonged use.
- Response Time: Adjust the response time setting (e.g., 2ms) for reduced motion blur in fast-paced games.

Figure 4: Visual representation of the monitor's color capabilities, including 99% sRGB coverage and 16.7 million color display for enhanced visual depth.
Maintenance
Cleaning the Monitor
- Always unplug the monitor from the power outlet before cleaning.
- Use a soft, lint-free cloth slightly dampened with water or a non-abrasive screen cleaner.
- Do not spray cleaner directly onto the screen. Apply it to the cloth first.
- Avoid using benzene, thinner, ammonia-based cleaners, or abrasive cleaning agents, as these can damage the screen or casing.
Storage
If storing the monitor for an extended period, disconnect all cables, pack it in its original packaging (if available), and store it in a cool, dry place away from direct sunlight and extreme temperatures.
Troubleshooting
If you encounter issues with your monitor, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable not connected; Power outlet not working; Monitor power button off. | Ensure power cable is securely connected to monitor and outlet. Check if the power outlet is functional. Press the monitor's power button. |
| No signal | Video cable not connected; Incorrect input source selected; Computer not powered on or in sleep mode. | Verify video cable (HDMI/DP) is securely connected to both monitor and computer. Select the correct input source via the OSD menu. Ensure computer is powered on and not in sleep mode. |
| Flickering screen | Incorrect refresh rate; Cable issue; Graphics driver issue. | Check monitor and computer display settings for correct refresh rate (144Hz). Try a different video cable. Update graphics drivers. |
| Image distorted or blurry | Incorrect resolution; Cable issue. | Ensure display resolution is set to 1920x1080p. Check video cable connections. |
| AMD FreeSync not working | Not enabled in OSD or graphics card settings; Incompatible graphics card. | Enable FreeSync in the monitor's OSD menu and in your AMD Radeon Software settings. Ensure your graphics card supports FreeSync. |
Technical Specifications
| Feature | Specification |
|---|---|
| Brand | Prechen |
| Model Number | HD-238 |
| Screen Size | 23.8 Inches (24 Inches stated in feature bullets) |
| Panel Type | IPS |
| Resolution | 1920 x 1080 (FHD 1080p) |
| Refresh Rate | 144 Hz |
| Response Time | 2 Milliseconds |
| Aspect Ratio | 16:9 |
| Color Gamut | 99% sRGB |
| Adaptive Sync Technology | AMD FreeSync Premium |
| Connectivity | 1x DisplayPort, 1x HDMI, 1x USB, 1x Audio In |
| Special Features | Blue Light Filter, Flicker-Free, Frameless Design |
| VESA Mount Compatible | 75 x 75 mm |
| Product Dimensions | 1 x 55 x 36 cm (without stand) |
| Item Weight | 2.5 Kilograms |
Warranty and Support
Prechen products are designed for reliability and performance. For information regarding warranty coverage, technical support, or service inquiries, please refer to the warranty card included with your product or visit the official Prechen website. Please have your model number (HD-238) and purchase information ready when contacting support.




