OONO 24/20-Pin ATX DC Power Supply Diagnostic/Breakout Board Module User Manual

1. Introduction

This manual provides detailed instructions for the OONO 24/20-Pin ATX DC Power Supply Diagnostic/Breakout Board Module. This device is designed to facilitate the testing and utilization of standard ATX power supplies by breaking out their various voltage rails to convenient screw terminals and providing diagnostic LED indicators.

2. Product Overview

The OONO Diagnostic/Breakout Board is a versatile tool for electronics enthusiasts, technicians, and hobbyists. It allows for easy access to the voltage outputs of an ATX power supply, enabling their use in various projects or for diagnostic purposes. The board features a standard 24-pin ATX connector, compatible with 20, 20+4, and 24-pin power supply headers, along with individual screw terminals for each voltage rail and ground. Integrated LEDs provide immediate visual feedback on the status of each output.

Figure 2.1: Top view of the OONO 24/20-Pin ATX DC Power Supply Diagnostic/Breakout Board Module, showing the 24-pin connector, screw terminals, and ON/OFF switch.

2.1. Product Visuals

3. Key Features

• Universal ATX Compatibility: Equipped with a 24-pin standard ATX connector, supporting 20-pin, 20+4-pin, and 24-pin wire headers from various ATX power supplies.
• Integrated Power Control: Features a latching button switch for convenient ON/OFF control of the connected ATX power supply output.
• Comprehensive Diagnostic LEDs: Includes 16 LEDs to visually indicate the functional status of all pins, excluding Common (COM) and Ground (GND). This allows for quick identification of faulty output wires.
• High-Quality Screw Terminal Blocks: Provides robust screw terminal blocks for each output position, capable of supporting a maximum current output of 10 Amperes. The terminals have a pitch of 5.0mm/0.197 inch and accommodate wire gauges from 26AWG to 12AWG (2.5mm square).
• Compact and Durable Design: Designed for reliability and ease of use in various applications.

4. Package Contents

Please verify that all items are present in your package:

• 1x OONO 24/20-Pin ATX DC Power Supply Diagnostic/Breakout Board Module
• 4x Screws
• 4x Nylon Spacers

Figure 4.1: Illustration of the OONO Diagnostic/Breakout Board with included screws and nylon spacers.

5. Setup Instructions

1. Mounting (Optional): If desired, use the provided screws and nylon spacers to mount the breakout board to a suitable surface. Ensure proper clearance and ventilation.
2. Connect ATX Power Supply: Carefully align the 24-pin ATX connector from your power supply with the corresponding header on the breakout board. Press firmly until it clicks into place. The board is compatible with 20-pin, 20+4-pin, and 24-pin ATX connectors.
3. Power On: Connect your ATX power supply to a power outlet. The PS_ON LED on the breakout board will light up, indicating standby power.

Figure 5.1: Detailed view of the 24-pin ATX connector on the breakout board.

6. Operating Instructions

1. Activating the Power Supply: Press the red latching button switch located on the board. The power supply will turn ON, and the PS_ON LED will turn OFF. All other diagnostic LEDs corresponding to active voltage rails should light up.
2. Accessing Voltage Rails: Use the screw terminals to connect wires to the desired voltage outputs (+3.3V, +5V, +12V, -12V, GND). Ensure correct polarity and secure connections. Each terminal can handle up to 10 Amperes.
3. Diagnostic LEDs:
   • When the power supply is ON, the LEDs for +3.3V, +5V, +12V, and -12V should illuminate, indicating that these voltage rails are active.
   • The PS_ON LED lights up when the output is OFF (standby mode) and goes out when the output is ON. This behavior is opposite to other LEDs.
   • If an LED for a specific voltage rail does not light up when the power supply is ON, it indicates a potential fault or absence of that voltage from the ATX power supply.
   • Note: Many newer ATX power supplies no longer provide a -5V output. In such cases, the NC/-V LED will not light up, which is normal and does not indicate a fault.
4. Deactivating the Power Supply: Press the red latching button switch again to turn the power supply OFF. The PS_ON LED will illuminate, and all other voltage rail LEDs will turn OFF.

Figure 6.1: Angled view showing the screw terminals and the ON/OFF button.

6.1. Operational Demonstration Videos

7. Technical Specifications

Figure 7.1: Schematic diagram of the breakout board.

Figure 7.2: Dimensional drawing of the breakout board.

8. Troubleshooting

• No LEDs light up:
  • Ensure the ATX power supply is properly connected to the board and plugged into a working power outlet.
  • Verify the ATX power supply itself is functional.
• PS_ON LED is ON, but other LEDs are OFF after pressing the switch:
  • This indicates the power supply is in standby mode. Ensure the latching button switch has been pressed to turn the power supply ON. The PS_ON LED should turn OFF when the power supply is active.
• Specific voltage rail LED is OFF when power supply is ON:
  • This suggests a potential fault with that specific voltage output from your ATX power supply.
  • Exception: The NC/-V LED (for -5V) will not light up if your ATX power supply does not provide a -5V output, which is common in modern power supplies. This is not an indication of a fault.
• Intermittent power or voltage readings:
  • Check all connections, especially the 24-pin ATX connector, to ensure they are secure.
  • Inspect the screw terminal connections for tightness and proper wire contact.

9. Safety Information

• Always ensure the ATX power supply is disconnected from the mains power before making or changing any connections to the breakout board.
• Do not exceed the maximum current rating of 10 Amperes per terminal.
• Avoid short-circuiting any voltage rails.
• Keep the board away from moisture and extreme temperatures.
• This product is intended for use by individuals familiar with basic electronics and electrical safety practices.

10. Warranty and Support

For warranty information or technical support, please refer to the retailer or manufacturer's official website. Keep your purchase receipt for any warranty claims.

Manufacturer: CZH-LABS

Brand: OONO