{"id":3891,"date":"2026-05-08T07:12:26","date_gmt":"2026-05-08T07:12:26","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=3891"},"modified":"2026-05-15T01:53:08","modified_gmt":"2026-05-15T01:53:08","slug":"front-panel-connector","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/front-panel-connector\/","title":{"rendered":"Front Panel Connector: Complete Pinout Reference for Engineers &#038; Systems Builders"},"content":{"rendered":"<h2><b><span data-font-family=\"Arial\">Key Takeaways<\/span><\/b><\/h2>\n<ul>\n<li><b><\/b><b><span data-font-family=\"Arial\">All consumer motherboard front panel headers use 2.54 mm (0.1 in) pitch: <\/span><\/b><span data-font-family=\"Arial\">F_PANEL (10-1 pin), F_USB 2.0 (10-pin), F_USB 3.2 Gen 1 (20-pin), and F_AUDIO (10-pin) all share this pitch but are NOT interchangeable housings.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">PWR_SW and RESET_SW are non-polar: <\/span><\/b><span data-font-family=\"Arial\">either orientation works. PWR_LED and HDD_LED are polarity-sensitive \u2014 reversed polarity gives no illumination but the system boots normally.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">HD Audio and AC\u201997 use the same physical header but different protocols: <\/span><\/b><span data-font-family=\"Arial\">HD Audio supports 192 kHz\/32-bit and jack detection; AC\u201997 is limited to 48 kHz\/16-bit with no jack sense. Never use an AC\u201997 cable carrying Pin 4 \u221212 V on an HD Audio header \u2014 this can damage the motherboard audio circuit.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Pin 1 identification is critical: <\/span><\/b><span data-font-family=\"Arial\">marked by a square solder pad (underside), silkscreen arrow or triangle (top surface), or the printed digit \u20181\u2019. Pin 9 (F_PANEL\/F_USB 2.0) and Pin 8 (F_AUDIO) are absent as mechanical orientation keys.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Troubleshooting no-power: <\/span><\/b><span data-font-family=\"Arial\">bridge PWR_SW pins (7 &amp; 8) directly with a screwdriver. If system starts, PWR_SW is the fault. Remove all F_PANEL connectors and test with only PWR_SW to isolate bridging from other connectors.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">USB 3.2 Gen 1 cables are not mechanically compatible with USB 2.0 headers: <\/span><\/b><span data-font-family=\"Arial\">the 20-pin connector cannot be inserted into a 10-pin header. Some USB 3.2 Gen 1 cables include a built-in USB 2.0 pass-through for boards lacking a 20-pin header.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Introduction: The Front Panel Interface<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">The <a href=\"http:\/\/lcsc.com\/front-panel\">front panel<\/a> connectors system is the critical signal bridge between the physical controls built into a PC chassis \u2014 power buttons, reset buttons, status LEDs, audio jacks, and USB ports \u2014 and the corresponding logic circuits on the motherboard. Every time a user presses the power button, a momentary electrical contact is made across two header pins that signal the system power controller (typically part of the Super I\/O or embedded controller) to initiate the power-on sequence.<\/span><\/p>\n<p><span data-font-family=\"Arial\">For engineers designing custom systems, integrators building workstations, and enthusiasts assembling performance rigs, correct front panel connector wiring is non-negotiable. A misrouted connector can prevent a system from powering on, produce non-functional USB ports, or cause persistent front-audio silence. This guide consolidates the complete pinout specifications for all standard front panel headers with pin-for-pin reference tables, polarity guidance, wiring procedures, and a structured troubleshooting matrix.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">The Anatomy of a Front Panel Header<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">2.1 Standard <a href=\"https:\/\/blogs.lcsc.com\/blog\/26-pin-flat-ribbon-cable-selection-guide-awg-pitch-idc-termination\/\">2.54 mm Pitch<\/a><\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">All consumer motherboard front panel headers use the industry-standard 2.54 mm (0.1 inch) centre-to-centre pin pitch. This pitch is mechanically compatible with the Dupont connector family (KF2510 \/ JST-XH-equivalent \/ generic 2.54 mm crimp housings), which is the connector type supplied with virtually all retail PC chassis.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Reading the Pin 1 Indicator<\/span><\/b><\/h3>\n<ul>\n<li><b><\/b><b><span data-font-family=\"Arial\">Square pad: <\/span><\/b><span data-font-family=\"Arial\">Pin 1 is soldered to a square pad on the PCB underside while all other pins use round pads.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Silkscreen arrow or triangle: <\/span><\/b><span data-font-family=\"Arial\">A small printed arrow or triangle points toward Pin 1 on the top surface near the header.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Numeric label: <\/span><\/b><span data-font-family=\"Arial\">The digit \u20181\u2019 is printed in silkscreen directly adjacent to Pin 1.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Absent pin (key pin): <\/span><\/b><span data-font-family=\"Arial\">On 10-pin headers, Pin 9 is intentionally absent as a physical key to prevent 180\u00b0 misinsertion.<\/span><\/li>\n<\/ul>\n<p><span data-font-family=\"Arial\">Engineering Note: When a chassis cable has individual single-pin connectors (common with power\/reset\/LED), each pin is inserted into the header one at a time. The keyed absent Pin 9 only prevents gross misinsertion on multi-pin USB housings, not on individual pin insertions. Verify each target pin number against PCB silkscreen before seating.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Front PANEL Header \u2014 Power, Reset &amp; LED Pinout<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Intel Front Panel I\/O Connectivity Design Guide \u2014 10-1 Pin Layout<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The 10-1 pin front panel header (F_PANEL, JFP1, or PANEL) is defined by the Intel Front Panel I\/O Connectivity Design Guide. It carries four independent signals: power switch, reset switch, power\/status LED, and hard disk activity LED. Pin 9 is absent as a mechanical key.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><b><span data-font-family=\"Arial\">Pin (Left)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Signal (Left)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><b><span data-font-family=\"Arial\">Pin (Right)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Signal (Right)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><b><span data-font-family=\"Arial\">Notes<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">PWR_LED+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">PWR_LED\u2212 \/ MSG_LED\u2212<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Power LED anode \/ cathode<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">HDD_LED+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">4<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">HDD_LED\u2212<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">HDD activity LED<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">5<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">RESET_SW<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">6<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">GND<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Reset switch (non-polar)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">7<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">PWR_SW<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">8<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">GND<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Power switch (non-polar)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">KEY (absent)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">10<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">NC \/ GND<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Pin 9 unpopulated \u2014 orientation key<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span data-font-family=\"Arial\">Polarity Rule: PWR_LED and HDD_LED signals are polarity-sensitive. A reversed LED connector results in no illumination \u2014 the system boots normally, but the LED remains dark. PWR_SW and RESET_SW are momentary-contact switches and are non-polar; connector orientation has no functional consequence.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Form Factor Header Placement Comparison<\/span><\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Header<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">ATX (Full \/ Mid Tower)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><b><span data-font-family=\"Arial\">Micro-ATX<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"184\"><b><span data-font-family=\"Arial\">Mini-ITX<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">F_PANEL (10-1)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Lower-right corner, near edge<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Lower-right corner<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"184\"><span data-font-family=\"Arial\">Lower-right or bottom edge<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">F_USB2 (2\u00d75)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Lower portion, right side<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Lower-right area<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"184\"><span data-font-family=\"Arial\">Bottom edge (often only 1 port)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">F_USB3 (20-1)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Lower-right, above F_PANEL<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Limited; may be absent<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"184\"><span data-font-family=\"Arial\">Often absent; rear I\/O only<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">F_AUDIO (10-1)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Lower-left corner near ATX power<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Lower-left<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"184\"><span data-font-family=\"Arial\">Left edge or bottom<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\">USB Front Panel Header Pinouts<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">USB 2.0 Internal Header (F_USB \/ JUSB) \u2014 10-Pin 2\u00d75<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The USB 2.0 internal header provides connectivity for up to two USB 2.0 Type-A front panel ports. It uses a 2\u00d75, 2.54 mm pitch dual-row layout with Pin 9 absent as a mechanical key. The header supplies up to 500 mA per port at +5 V.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><b><span data-font-family=\"Arial\">Pin<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">Signal<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><b><span data-font-family=\"Arial\">Description<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Wire Colour<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">VCC<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><span data-font-family=\"Arial\">+5 V power supply<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Red<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">USB_D\u2212<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><span data-font-family=\"Arial\">Data negative (differential pair)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">White<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">USB_D+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><span data-font-family=\"Arial\">Data positive (differential pair)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Green<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">4<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">GND<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><span data-font-family=\"Arial\">Ground return<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Black<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">5\u20138<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Port 2 signals<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><span data-font-family=\"Arial\">Mirrors pins 1\u20134 for second USB 2.0 port<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Same colours, Port 2<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">KEY (absent)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><span data-font-family=\"Arial\">Orientation key \u2014 pin intentionally missing<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"80\"><span data-font-family=\"Arial\">10<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">OC_FLAG#<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"250\"><span data-font-family=\"Arial\">Overcurrent indicator (active low)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">USB 3.2 Gen 1 Internal Header (F_USB30) \u2014 20-Pin 2\u00d710<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The USB 3.2 Gen 1 internal header supports two SuperSpeed ports delivering up to 5 Gbps data transfer and 900 mA per port. It includes dedicated SuperSpeed differential pairs (SSTX and SSRX) plus USB 2.0 backward-compatibility lines. Pin 19 is absent as the orientation key.<\/span><\/p>\n<p><span data-font-family=\"Arial\">Important mechanical note: USB 3.2 Gen 1 headers are NOT mechanically compatible with USB 2.0 chassis cables. The 20-pin connector cannot be cross-inserted into a 10-pin header. Some USB 3.2 Gen 1 cables include a built-in USB 2.0 header pass-through for boards lacking a 20-pin header.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><b><span data-font-family=\"Arial\">Pin<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><b><span data-font-family=\"Arial\">Signal<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><b><span data-font-family=\"Arial\">Description<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><b><span data-font-family=\"Arial\">Notes<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">VBUS<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><span data-font-family=\"Arial\">+5 V power<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Standard power<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">2\/3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">SSTX1\u2212\/+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><span data-font-family=\"Arial\">SuperSpeed TX differential pair \u2014 Port 1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Gen 1 transmit<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">5\/6<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">SSRX1\u2212\/+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><span data-font-family=\"Arial\">SuperSpeed RX differential pair \u2014 Port 1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Gen 1 receive<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">8\/9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">SSTX2\u2212\/+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><span data-font-family=\"Arial\">SuperSpeed TX differential pair \u2014 Port 2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Gen 1 transmit<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">11\/12<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">SSRX2\u2212\/+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><span data-font-family=\"Arial\">SuperSpeed RX differential pair \u2014 Port 2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Gen 1 receive<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">14\/15<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">D\u2212\/D+<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><span data-font-family=\"Arial\">USB 2.0 data lines (backward compatibility)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">\u00a0<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">19<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">KEY (absent)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"290\"><span data-font-family=\"Arial\">Orientation key \u2014 pin unpopulated<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">\u00a0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\">Front Audio Header: HD Audio vs. AC\u201997<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Critical Distinction: HD Audio and AC\u201997 Are Not Interchangeable<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The Intel HD Audio specification and the legacy AC\u201997 specification use the same 2\u00d75, 10-1 pin header physical layout but differ in signalling protocol, voltage levels, and feature set. All modern motherboards (Intel 6th Generation \/ AMD Zen and later) implement HD Audio exclusively. AC\u201997 was the prevailing standard from approximately 1997 through 2010.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Attribute<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><b><span data-font-family=\"Arial\">AC\u201997 (Legacy)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><b><span data-font-family=\"Arial\">HD Audio (Modern)<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Standard<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">AC\u201997 (1997, Intel)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">Intel HD Audio (2004+)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Max Sample Rate<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">48 kHz<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">192 kHz<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Bit Depth<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">16-bit<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">32-bit<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Jack Detection<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">Not supported<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">Hardware jack sense on pin 7\/10<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Retasking<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">Not available<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">Supported (mic jack as line-in, etc.)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Pin 4<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">\u221212 V analog bias (ACTIVE)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"218\"><span data-font-family=\"Arial\">NC (no connection)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b><span data-font-family=\"Arial\">SAFETY: AC\u201997 Pin 4 Carries \u221212 V on Legacy Cables<\/span><\/b><\/p>\n<p><span data-font-family=\"Arial\">On AC\u201997 headers, Pin 4 carries a \u221212 V bias voltage required by older analog codec designs. This pin is NC (no connection) on all HD Audio boards. If using an AC\u201997-labelled chassis cable on a modern HD Audio header: verify with the chassis manufacturer that Pin 4 on the cable is unconnected. A chassis cable that connects Pin 4 to an active \u221212 V source will inject \u221212 V into a no-connect pad on the HD Audio circuit, which can damage the motherboard audio codec. Always use the HD Audio connector if your case provides both options.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">HD Audio Header Pin-for-Pin Specification<\/span><\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><b><span data-font-family=\"Arial\">Pin<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><b><span data-font-family=\"Arial\">Signal<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><b><span data-font-family=\"Arial\">Description<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><b><span data-font-family=\"Arial\">HD Req?<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">AAFP_MIC2L<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Microphone left channel<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Required<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">GND<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Audio ground \u2014 separate from system GND<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Required<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">AAFP_MIC2R<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Microphone right channel (some boards)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Optional<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">4<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">\u221212V or NC<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Legacy AC\u201997 \u221212 V bias. NC on all HD Audio boards.<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Legacy only<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">5<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">AAFP_MIC_PWR<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Microphone bias voltage (+2.5 V or +5 V)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Required<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">6<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">AAFP_LINE2R<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Front panel headphone right channel out<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Required<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">7<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">JACK_SENSE<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Jack detection line \u2014 active low when plug inserted<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Required<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">8<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">KEY (absent)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Pin 8 unpopulated \u2014 orientation key<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">AAFP_LINE2L<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Front panel headphone left channel out<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Required<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">10<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">JACK_DETECT<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"264\"><span data-font-family=\"Arial\">Return\/sense for right channel (HD Audio only)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">HD only<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\">Electrical Wiring Guide: Step-by-Step Front Panel Connector Installation<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Pre-Wiring Checklist<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"Arial\">Ground yourself with an ESD wrist strap or by touching the unpainted metal chassis frame before handling the motherboard.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Power down completely; confirm the PSU rocker switch is in the OFF position.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Locate the F_PANEL header using the board silkscreen or the manual\u2019s motherboard layout diagram.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Identify Pin 1 using the square pad, silkscreen triangle, or the \u20181\u2019 label adjacent to the header.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Sort chassis cables by label: PWR_LED, HDD_LED, PWR_SW, and RESET_SW.<\/span><\/li>\n<\/ul>\n<h3><b><span data-font-family=\"Arial\">Front Panel Connectors <\/span><\/b><b><span data-font-family=\"Arial\">Wiring Procedure<\/span><\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">Connector<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Target Pin(s)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"130\"><b><span data-font-family=\"Arial\">Polarity Sensitive?<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">Tip<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">\u00a0<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">PWR_LED+\/\u2212<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Pin 1 (+), Pin 3 (\u2212)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"130\"><span data-font-family=\"Arial\">YES \u2014 LED will not light if reversed<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Longer wire lead = anode (+)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">\u00a0<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">HDD_LED<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Pin 3 (+), Pin 5 (\u2212)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"130\"><span data-font-family=\"Arial\">YES \u2014 activity LED<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Red wire typically = +<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">\u00a0<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">PWR_SW<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Pin 7 &amp; Pin 8<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"130\"><span data-font-family=\"Arial\">NO \u2014 non-polar<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Either orientation works<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">\u00a0<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">RESET_SW<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Pin 5 &amp; Pin 6<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"130\"><span data-font-family=\"Arial\">NO \u2014 non-polar<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Either orientation works<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66\"><span data-font-family=\"Arial\">\u00a0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">Step-by-Step Installation Sequence<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"Arial\">Install RESET_SW first (non-polar, least risk): place the 2-pin connector over Pins 5 and 6.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Install PWR_SW: place the 2-pin connector over Pins 7 and 8.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Install HDD_LED (polarity-sensitive): positive wire (usually red) to Pin 3 (HDD_LED+), negative to Pin 5 (HDD_LED\u2212).<\/span><\/li>\n<li><span data-font-family=\"Arial\">Install PWR_LED (polarity-sensitive): connect Pin 1 (PWR_LED+) and the adjacent negative pin.<\/span><\/li>\n<li><span data-font-family=\"Arial\">F_AUDIO: align the 10-pin connector so the absent Pin 8 cavity matches the missing pin. Seat firmly until the housing clicks.<\/span><\/li>\n<li><span data-font-family=\"Arial\">F_USB 2.0: align the keyed 10-pin connector (absent Pin 9) with the header. The notch enforces correct orientation.<\/span><\/li>\n<li><span data-font-family=\"Arial\">F_USB 3.2 Gen 1: the 20-pin connector has a distinctive L-shaped cutout that physically prevents incorrect insertion.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Troubleshooting &amp; Failure Mode Reference<\/span><\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Symptom<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Likely Cause<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><b><span data-font-family=\"Arial\">Diagnostic Step<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><b><span data-font-family=\"Arial\">Fix<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">System won\u2019t POST \/ no power<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">PWR_SW on wrong pins or off header<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Bridge PWR_SW pins (7&amp;8) with screwdriver<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><span data-font-family=\"Arial\">Reseat PWR_SW connector<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Power LED stays off<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Reversed LED polarity (Pin 1\/3 swapped)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Swap + and \u2212 connector leads<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><span data-font-family=\"Arial\">Reverse connector orientation<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">HDD LED never illuminates<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Reversed polarity or SSD (no spinning disk)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Check SATA activity LED in BIOS<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><span data-font-family=\"Arial\">Reverse connector; confirm drive type<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Reset switch powers off system<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">RESET_SW plugged into PWR_SW pins<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Visually inspect connector placement<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><span data-font-family=\"Arial\">Move RESET_SW to correct pins (5 &amp; 6)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Front audio silent<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">AC\u201997 connector on HD Audio header<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Check connector label vs. motherboard manual<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><span data-font-family=\"Arial\">Use HD Audio connector; verify codec in OS<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Front USB device not recognised<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">USB3 cable in USB2 header<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Count header pins \u2014 USB3 has 20 pins<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><span data-font-family=\"Arial\">Use correct header; check BIOS USB settings<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">System powers on but immediately shuts off<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Bent connector bridging adjacent LED\/switch pins<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"133\"><span data-font-family=\"Arial\">Inspect all connectors for bridged pins<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170\"><span data-font-family=\"Arial\">Straighten \/ replace connector housing<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">No-Power Diagnostics: Systematic Approach<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"Arial\">Confirm mains power: PSU rocker switch ON, IEC cable seated, wall outlet active.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Short PWR_SW pins manually: briefly bridge Pins 7 and 8 on the F_PANEL header. If the system starts, PWR_SW cable or button is at fault.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Check for chassis shorts: remove the motherboard from the case and place on a non-conductive surface. Retry the PWR_SW short test. If the system now starts, a standoff or chassis component is shorting the motherboard.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Inspect LED connectors for bridging: remove all F_PANEL connectors and retest with only PWR_SW connected. Individual Dupont pins can drift and contact adjacent pins.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Verify PSU health: connect a known-good PSU or use a PSU tester. A PSU in protection mode due to a downstream short will not respond to PWR_SW.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Component Integration: Replacement Front Panel Connector Specifications<\/span><\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><b><span data-font-family=\"Arial\">F_PANEL \/ F_AUDIO<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><b><span data-font-family=\"Arial\">F_USB 2.0<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><b><span data-font-family=\"Arial\">F_USB 3.2 Gen 1<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Header pitch<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">2.54 mm (0.1&#8243;)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">2.54 mm (0.1&#8243;)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">2.54 mm (0.1&#8243;)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Pin count<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">10 (9+1 key)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">10 (9+1 key)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">20 (19+1 key)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Voltage<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">3.3 V \/ 5 V logic<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">+5 V (500 mA per port)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">+5 V (900 mA per port)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Max current per port<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">\u2264 20 mA (LEDs)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">500 mA USB 2.0<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">900 mA USB 3.2 Gen 1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Connector family<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">Dupont \/ KF2510 \/ JST-XH 2.54 mm<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">Same, keyed housing<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"154\"><span data-font-family=\"Arial\">Dedicated USB 3.0 housing<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\">Quick Selection Guide: Front Panel Connector Troubleshooting in 60 Seconds<\/span><\/b><\/h2>\n<ul>\n<li><span data-font-family=\"Arial\">System won\u2019t power on \u2192 Bridge PWR_SW pins (7 &amp; 8) directly with a screwdriver. System starts \u2192 cable\/button fault. Still no start \u2192 PSU\/board issue<\/span><\/li>\n<li><span data-font-family=\"Arial\">Power LED dark but system boots? \u2192 Reversed PWR_LED polarity \u2014 flip the connector 180\u00b0<\/span><\/li>\n<li><span data-font-family=\"Arial\">Reset button turns system off instead of rebooting \u2192 RESET_SW is on PWR_SW pins \u2014 move to Pins 5 &amp; 6<\/span><\/li>\n<li><span data-font-family=\"Arial\">Front audio headphone jack silent \u2192 Check connector label: AC\u201997 on HD Audio header degrades audio. Switch to HD Audio connector. Also check OS sound settings for front panel codec<\/span><\/li>\n<li><span data-font-family=\"Arial\">Front USB device not recognised \u2192 Confirm header pin count. USB 3.2 Gen 1 = 20 pins; USB 2.0 = 10 pins. Enable USB ports in BIOS if header is correct<\/span><\/li>\n<li><span data-font-family=\"Arial\">Building custom cable extensions \u2192 Use 2.54 mm Dupont single-pin housings for F_PANEL signals; use dedicated USB 3.0 housing for F_USB 3.2 Gen 1 (not interchangeable with 10-pin USB 2.0)<\/span><\/li>\n<li><span data-font-family=\"Arial\">Working with an AC\u201997 chassis cable on a modern board \u2192 Verify Pin 4 is NC (unconnected) on the cable before plugging in \u2014 an active \u221212 V on Pin 4 can damage the motherboard audio codec<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Conclusion<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">Front panel connectors wiring is a precision task that rewards methodical execution. Understand the polarity rules \u2014 LED connectors are sensitive, switch connectors are not. Identify Pin 1 before seating any connector. Use the troubleshooting matrix to isolate symptoms systematically rather than reseating every connector at random. For audio, always verify the HD Audio vs AC\u201997 distinction before plugging in front panel audio \u2014 the physical connectors fit either header, but the Pin 4 voltage difference means an incompatible cable can cause damage, not just degraded audio.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Find What You Need on <a href=\"https:\/\/www.lcsc.com\/\">LCSC<\/a><\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">Browse front panel components on LCSC \u2014 2.54 mm Dupont crimp housings, panel-mount pushbutton switches, USB 2.0 and USB 3.0 internal header cables, and SMD tactile switches for custom builds.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways All consumer motherboard front panel headers use 2.54 mm (0.1 in) pitch: F_PANEL (10-1 pin), F_USB 2.0 (10-pin), F_USB 3.2 Gen 1 (20-pin), and F_AUDIO (10-pin) all share this pitch but are NOT interchangeable housings. PWR_SW and RESET_SW are non-polar: either orientation works. PWR_LED and HDD_LED are polarity-sensitive \u2014 reversed polarity gives no [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"iawp_total_views":43,"footnotes":""},"categories":[253],"tags":[254,299,12,297],"class_list":["post-3891","post","type-post","status-publish","format-standard","hentry","category-front-panel","tag-front-panel","tag-front-panel-connectors","tag-lcsc","tag-panel"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Front Panel Connector: Complete Pinout Reference | LCSC<\/title>\n<meta name=\"description\" content=\"Front panel connector guide for PC builders \u2014 pinouts, polarity rules, audio vs AC\u201997 safety, USB compatibility, and troubleshooting tips.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.lcsc.com\/blog\/front-panel-connector\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Front Panel Connector: Complete Pinout Reference | LCSC\" \/>\n<meta property=\"og:description\" content=\"Front panel connector guide for PC builders \u2014 pinouts, polarity rules, audio vs AC\u201997 safety, USB compatibility, and troubleshooting tips.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.lcsc.com\/blog\/front-panel-connector\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog | LCSC Electronics\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-08T07:12:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-15T01:53:08+00:00\" \/>\n<meta name=\"author\" content=\"LCSC Editor\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"LCSC Editor\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/front-panel-connector\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/front-panel-connector\\\/\"},\"author\":{\"name\":\"LCSC Editor\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#\\\/schema\\\/person\\\/11d3b92d0208775e62d7f79a0da4e781\"},\"headline\":\"Front Panel Connector: Complete Pinout Reference for Engineers &#038; 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