Introduction
When building or troubleshooting a PC, understanding power connections is crucial. One of the most important power connectors in a modern computer is the 24-pin power connector, which supplies power to the motherboard. This article explores which PC component uses this connector, its significance, and related concepts for the CompTIA A+ 220-1102 exam.
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Understanding the 24-Pin Power Connector
The 24-pin power connector is the primary power supply connection on a motherboard. It delivers power from the Power Supply Unit (PSU) to the motherboard, ensuring stable voltage distribution to all components.
Key Features:
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Provides +3.3V, +5V, +12V, and -12V rails.
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Ensures stable power for the CPU, RAM, and onboard peripherals.
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Often includes a 4-pin detachable segment, making it backward compatible with 20-pin motherboards.
Which PC Component Uses the 24-Pin Connector?
The motherboard is the primary component that connects to the 24-pin power connector. This connector comes from the Power Supply Unit (PSU) and is essential for booting the system.
Components Powered by the 24-Pin Connector:
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Chipset (Northbridge/Southbridge in older systems)
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RAM slots
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PCIe slots (partial power)
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Onboard USB/SATA controllers
Without this connection, the motherboard will not receive power, preventing the system from starting.
Evolution of Motherboard Power Connectors
Before the 24-pin standard, motherboards used:
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20-pin ATX connector (early ATX motherboards)
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AT connectors (older systems with P8/P9 connectors)
The shift to 24-pin was necessary due to:
- Increased power demands of modern CPUs and GPUs.
- Better power distribution for stability.
- Support for PCI Express (PCIe) slots.
How the 24-Pin Connector Works?
The 24-pin ATX power connector distributes power as follows:
| Pin | Voltage | Function |
|---|---|---|
| 1-12 | +3.3V, +5V, +12V | Main power delivery |
| 13-24 | Ground, +5VSB, PS_ON# | Standby power & control signals |
Critical Signals:
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+5VSB (Standby Voltage) – Powers the motherboard when the PC is off (for Wake-on-LAN, USB charging).
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PS_ON# – A low-voltage signal that tells the PSU to turn on.
Importance in Power Delivery
A stable 24-pin connection ensures:
- Reliable boot-up – Without it, the motherboard won’t power on.
- Prevents voltage fluctuations – Protects sensitive components.
- Supports high-power components – Necessary for gaming PCs and workstations.
Troubleshooting Power Issues
Common 24-pin power connector problems and fixes:
A. PC Won’t Turn On
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Check if the connector is fully seated.
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Test the PSU using a paperclip test (jump PS_ON# to ground).
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Inspect for bent pins on the motherboard.
B. Random Shutdowns
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Ensure the PSU provides enough wattage.
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Check for overheating near the power connector.
C. No Standby Power (No LED Lights)
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Verify +5VSB is working (use a multimeter).
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Replace the PSU if needed.
Best Practices for Handling Power Connectors
- Always disconnect power before handling.
- Ensure a firm connection (listen for a click).
- Avoid forcing the connector (align properly).
- Use a modular PSU for better cable management.
Conclusion
The 24-pin power connector is a critical link between the PSU and motherboard, ensuring stable power delivery. Understanding its role is essential for PC building, troubleshooting, and CompTIA A+ 220-1102 exam success.
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Actual Exam Questions For CompTIA's 220-1102 Preparation Material
Sample Questions For CompTIA A+ 220-1102 Practice Test
1. Which PC component typically has a 24-pin power connector on the motherboard?
A) GPU (Graphics Processing Unit)
B) PSU (Power Supply Unit)
C) CPU (Central Processing Unit)
D) SSD (Solid State Drive)
2. The 24-pin power connector on a motherboard is primarily used to:
A) Provide power to the CPU
B) Supply power to the entire motherboard
C) Connect the graphics card
D) Power the RAM modules
3. What is the most common type of 24-pin power connector used in modern PCs?
A) PCIe 6+2 pin
B) SATA power connector
C) ATX 24-pin
D) Molex 4-pin
4. Which of the following components connects directly to the motherboard via a 24-pin power connector?
A) Hard Drive (HDD)
B) Power Supply Unit (PSU)
C) Cooling Fan
D) Optical Drive
5. If a motherboard lacks a 24-pin power connection, what is the most likely issue?
A) The GPU won’t function
B) The system will not power on
C) The SSD won’t be detected
D) The RAM will run at lower speeds