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Difficulty: MediumMotherboards Form Factors and Connectors

A system builder is connecting the small, individual wire leads from a PC case to the motherboard during a custom desktop assembly. These leads include wires labeled POWER SW, RESET SW, HDD LED, and POWER LED. To which of the following motherboard locations should these connectors be attached?

  1. Front panel system headerAnswer
  2. B
    24-pin ATX power connector
  3. C
    S/PDIF audio header
  4. D
    Trusted Platform Module (TPM) header

Answer

Front panel system header
The front panel system header consists of a keyed array of small pins on the motherboard specifically designed to accept the individual 1-pin and 2-pin connectors from the computer case for power, reset, and status LEDs.

Step-by-Step Solution

1
Identify the function of the case leads (POWER SW, RESET SW, HDD LED, POWER LED).
Recognize that these are low-voltage switches and status indicators originating from the chassis controls.
Chassis controls require a centralized pin block on the motherboard to signal power states and drive activity.
2
Locate the designated motherboard interface designed for chassis switches and indicators.
Identify the Front Panel System Header (F_PANEL / JFP1).
Motherboard pin blocks are standardized by function; the front panel header uses specific pin pair orientations for switch contacts and positive/negative LED diodes.

Key Concept

Motherboard Front Panel Headers and Pin Assignments
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Topics

Motherboards Form Factors and Connectors

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