FIELD GUIDESource-led reference
Port & Cable

P346 / PC internal / Connector

HD Audio front-panel header — keyed 2×5 (Intel example)

Intel’s Thin Mini-ITX front-panel audio example uses a 2×5 header at 2.54 mm nominal pitch with absent position 8, unlike the pin-9-keyed USB 2.0 example.

Also called HD AUDIO header AAFP motherboard header 10-1 front-panel audio front panel audio 2x5

Do not identify an audio header by a 2×5 outline alone; even similarly keyed HD-audio implementations can use different pitches.

Look for

Look for HD_AUDIO or front-audio marking and the motherboard manual’s key location; confirm connector width and pitch rather than guessing.

Claim inspection dates: 2026-10-09, 2026-10-13 · Independent review pending

HD Audio front-panel header — keyed 2×5 (Intel example): three-quarter view. Computer-generated illustration, not a photograph.

Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

HD Audio front-panel header — keyed 2×5 (Intel example): mating face. Computer-generated illustration, not a photograph.

Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

HD Audio front-panel header — keyed 2×5 (Intel example): fitted in place. Computer-generated illustration, not a photograph.

Fitted in place Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

HD Audio front-panel header — keyed 2×5 (Intel example): original recognition drawing, not to scale.

Recognition drawing Original schematic, not to scale. Drawing review pending.

Image inspection / P346

See the view. Check its scope.

1 registered view for this reference. Different part examples are not automatically mates; all remain not to scale and independently unapproved.

Two rows with an internal gap, not the USB row-end gap in the same manual. Original source-observed board-side contact-layout study; no housing specification, scale, pin functions or fit approval. (private workspace)

P346 / Source-observed physical study

Front audio / JAUD1

MSI B550-A PRO JAUD1

Board-side plan layout, following the cited diagram orientation · Board header

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)
INTERNAL SYSTEMS / HEADERS

Front HD Audio’s example key is different from the USB2 key

No. Intel’s documented front-panel HD Audio 2×5 header example has position 8 absent, whereas its Thin Mini-ITX USB2 example has position 9 absent. The electrical signals also serve entirely different purposes; the geometry alone does not grant safe cross-use.

Conceptual role comparison: USB 2.0 front-panel example versus HD Audio front-panel example. Different signals and manufacturer-specific assignments; never force. Not to scale, no pinout or mechanical mating dimensions.
Look-alike motherboard keys. Original qualitative role diagram; not mechanical artwork, not to scale or a wiring map. Source context S456 · S457.

Three checks before proceeding

  1. Verify the motherboard’s AAFP/F_AUDIO/HD_AUDIO header diagram.
  2. Identify the actual front-panel chassis connector and orientation.
  3. Use the board maker’s guidance for any AC’97 legacy variant.

One mistake to avoid

Forcing a chassis HD AUDIO cable onto a USB header or using old AC’97 pin expectations automatically.

Full technical reading, sources and related identities →

Claim-specific evidence remains in the canonical record. Concept diagrams do not show any safe wiring or mechanical mating geometry.

The useful distinction

Recognize it. Then verify it.

Intel’s Thin Mini-ITX front-panel audio example uses a 2×5 header at 2.54 mm nominal pitch with absent position 8, unlike the pin-9-keyed USB 2.0 example. [C346A]

Intel NUC 9 documentation separately specifies a similar 2×5 audio header with the same position 8 absent but a 2.0 mm pitch: the exact platform matters. [C346B]

B550-A PRO identifies JAUD1 as the front-panel audio-jack connector. [C346C]

JAUD1’s table distinguishes absent position 8 from unconnected position 4. [C346D]

The JAUD1 table includes microphone/headphone detection functions; it is not a USB signal table. [C346E]

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Contact rows2 (Source-described array; C346A); 2 (Source-described array; C346B); 2 (B550-A PRO:JAUD1)S456 · S457 · S757Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Manufacturer-specific family/physical identification only. No inferred device wiring, mating verification or installation approval. B550-A PRO:JAUD1. Documented role: PCB header. IntelThinMiniITXRev1.2p.21frontaudioseparately states2.54mmpitch;thatoldnominalscopeisretained,notremeasuredhere.; No board label,partmanufacturerorUSB/audiointerchangeabilityinferredfromsame2x5outline.
Contact pitch2 mm Source-described pitch / centerline (Claim C346B)S457Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Manufacturer-specific family/physical identification only. No inferred device wiring, mating verification or installation approval.
Connector rolePCB header (B550-A PRO:JAUD1)S757Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. B550-A PRO:JAUD1. Documented role: PCB header. IntelThinMiniITXRev1.2p.21frontaudioseparately states2.54mmpitch;thatoldnominalscopeisretained,notremeasuredhere.; No board label,partmanufacturerorUSB/audiointerchangeabilityinferredfromsame2x5outline.
Keying / polarization10positionoutlinewithpin8absent;9loadedpositions (B550-A PRO:JAUD1)S757Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. B550-A PRO:JAUD1. Documented role: PCB header. IntelThinMiniITXRev1.2p.21frontaudioseparately states2.54mmpitch;thatoldnominalscopeisretained,notremeasuredhere.; No board label,partmanufacturerorUSB/audiointerchangeabilityinferredfromsame2x5outline.
ManufacturerMSI (B550-A PRO:JAUD1)S757Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. B550-A PRO:JAUD1. Documented role: PCB header. IntelThinMiniITXRev1.2p.21frontaudioseparately states2.54mmpitch;thatoldnominalscopeisretained,notremeasuredhere.; No board label,partmanufacturerorUSB/audiointerchangeabilityinferredfromsame2x5outline.
SeriesB550-A PRO (B550-A PRO:JAUD1)S757Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. B550-A PRO:JAUD1. Documented role: PCB header. IntelThinMiniITXRev1.2p.21frontaudioseparately states2.54mmpitch;thatoldnominalscopeisretained,notremeasuredhere.; No board label,partmanufacturerorUSB/audiointerchangeabilityinferredfromsame2x5outline.
Exact part / implementationB550-A PRO:JAUD1 (B550-A PRO:JAUD1)S757Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. B550-A PRO:JAUD1. Documented role: PCB header. IntelThinMiniITXRev1.2p.21frontaudioseparately states2.54mmpitch;thatoldnominalscopeisretained,notremeasuredhere.; No board label,partmanufacturerorUSB/audiointerchangeabilityinferredfromsame2x5outline.
View conventionPublished board-side connector diagram:odd1–9onlowerrow,even2–10onupperrow,lefttoright. Cablewire-sideisnotshown. (B550-A PRO:JAUD1)S757Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. B550-A PRO:JAUD1. Documented role: PCB header. IntelThinMiniITXRev1.2p.21frontaudioseparately states2.54mmpitch;thatoldnominalscopeisretained,notremeasuredhere.; No board label,partmanufacturerorUSB/audiointerchangeabilityinferredfromsame2x5outline.

Not recorded: Nominal contacts, Positions / cavity span, Populated contacts, Dimensions / axis, Contact gender / arrangement, Mounting, Coupling / latch, Shell / form, Recorded markings. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits
  • Check the exact device manual before wiring or applying power.
  • MSI MAG B550 TOMAHAWK JAUD1 (HD Audio): Per manual.
  • GIGABYTE B550 AORUS ELITE (AX) F_AUDIO (High Definition audio): Per manual.
  • Intel FPIO Design Guide rev 1.1 legacy (AC'97-style) front-panel audio header: Per Table 2-5.
  • Intel Thin Mini-ITX HD Audio: Intel Figure 2-5 board-header illustration as printed: absent position 8 is the upper contact in column four of five. Cable face versus wire-entry view is not explicitly labeled.
  • Intel Thin Mini-ITX passive AC’97: Intel Figure 2-5 board-header illustration as printed: absent position 8 is the upper contact in column four of five. Cable face versus wire-entry view is not explicitly labeled.
  • MSI B550-A PRO JAUD1: MSI p.33 board drawing: 2 upper left, 10 upper right, 1 lower left, 9 lower right; absent 8 in upper row. Cable rear not established.
Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

HD Audio front-panel header — keyed 2×5 (Intel example) facts and limitations
Intel Thin Mini-ITX reference2×5, key at position 8, 2.54 mm nominal pitch in that design guide [C346A]
NUC counterexample2×5, key at position 8, 2.0 mm nominal pitch in an Intel NUC 9 document [C346B]
Role and recognition scopeBoard header — MSI B550-A PRO JAUD1. Original qualitative study only; no wiring or fit approval. [C346C] [C346D] [C346E]
Mechanical dimensionsOnly manufacturer-described nominal family/footprint pitch is quoted in sourced text; no measured fabrication/tolerance drawing independently approved.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

Disconnect mains power before examining an internal header; find its exact model-specific location and label. Confirm nominal pitch and absent-key position in the current board manual; do not assume all HD Audio headers are 2.54 mm. Verify the chassis audio cable and board compatibility; do not confuse it with USB 2.0 or proprietary audio pinouts.

Before you connect

What to check

  1. Disconnect mains power before examining an internal header; find its exact model-specific location and label.
  2. Confirm nominal pitch and absent-key position in the current board manual; do not assume all HD Audio headers are 2.54 mm.
  3. Verify the chassis audio cable and board compatibility; do not confuse it with USB 2.0 or proprietary audio pinouts.
Trace a supported connection class →

Pins & wiring

Pinout

Choose the exact wiring. Pin numbers follow its stated view; a schematic does not establish physical positions. Check your exact device before wiring.

What the status labels mean
Confirmed
Recorded research passes agree within this variant; this is not independent human review or hardware validation.
Single source
Only one underlying document, or one pass, supports this assignment.
Device-specific
Supported for the named equipment or wiring only. Check your device’s manual.
Unverified
Missing or conflicting evidence. Do not wire from this row.
Not connected
The source explicitly says NC, no contact or no pin for this wiring.
Wiring variant

MSI MAG B550 TOMAHAWK JAUD1 (HD Audio)

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Per manual.

  • P346 HD Audio 2x5 header — **Agree** for MSI; **partial across Intel variants** — Different MSI manuals agree on all ten positions, including pin 4 NC. B's Intel Thin Mini-ITX HD Audio table assigns 4 PRESENCE# and supplies Intel HD Audio evidence absent in A. A's older Intel FPIO legacy-audio table and B's passive AC'97 table are distinct implementations. A's contradictory legacy pins 2/4 stay unverified; B's reserved passive pin 7 stays unverified. No shared document across passes.
  • Intel's HD Audio front-panel header table (in older FPIO editions, e.g. v1.3 2005, or Intel desktop board TPS documents) was not found on an Intel host; only mirrors were located and not used. Intel's own HD Audio signal names are therefore unverified.
  • Intel FPIO rev 1.1 header Table 2-5 has pin 2 AUD_GND / pin 4 AUD_VCC, but cable Table 4-1 has pin 2 AUD_VCC / pin 4 AUD_GND; those two rows are marked unverified.
HD Audio front-panel 2x5 header (Intel) engineering referencePer manual.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: MIC L (device_specific)12: Ground (device_specific)23: MIC R (device_specific)34: NC (not_connected)45: Head Phone R (device_specific)56: MIC Detection (device_specific)67: SENSE_SEND (device_specific)78: No Pin (not_connected)89: Head Phone L (device_specific)910: Head Phone Detection (device_specific)10powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
MSI MAG B550 TOMAHAWK JAUD1 (HD Audio) — source-scoped contact map
PinSignalWhat it doesStatus
1MIC LControl, detection or configuration connection; check the source and device.Device-specific
Sources
2GroundGround reference and return.Device-specific
Sources
3MIC RControl, detection or configuration connection; check the source and device.Device-specific
Sources
4NCNot connected or absent in this named wiring.Not connected
Sources
5Head Phone RControl, detection or configuration connection; check the source and device.Device-specific
Sources
6MIC DetectionControl, detection or configuration connection; check the source and device.Device-specific
Sources
7SENSE_SENDControl, detection or configuration connection; check the source and device.Device-specific
Sources
8No PinNot connected or absent in this named wiring.Not connected
Sources
9Head Phone LControl, detection or configuration connection; check the source and device.Device-specific
Sources
10Head Phone DetectionControl, detection or configuration connection; check the source and device.Device-specific
Sources
Sources (1)

GIGABYTE B550 AORUS ELITE (AX) F_AUDIO (High Definition audio)

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Per manual.

  • P346 HD Audio 2x5 header — **Agree** for MSI; **partial across Intel variants** — Different MSI manuals agree on all ten positions, including pin 4 NC. B's Intel Thin Mini-ITX HD Audio table assigns 4 PRESENCE# and supplies Intel HD Audio evidence absent in A. A's older Intel FPIO legacy-audio table and B's passive AC'97 table are distinct implementations. A's contradictory legacy pins 2/4 stay unverified; B's reserved passive pin 7 stays unverified. No shared document across passes.
  • Intel's HD Audio front-panel header table (in older FPIO editions, e.g. v1.3 2005, or Intel desktop board TPS documents) was not found on an Intel host; only mirrors were located and not used. Intel's own HD Audio signal names are therefore unverified.
  • Intel FPIO rev 1.1 header Table 2-5 has pin 2 AUD_GND / pin 4 AUD_VCC, but cable Table 4-1 has pin 2 AUD_VCC / pin 4 AUD_GND; those two rows are marked unverified.
HD Audio front-panel 2x5 header (Intel) engineering referencePer manual.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: MIC2_L (device_specific)12: GND (device_specific)23: MIC2_R (device_specific)34: NC (not_connected)45: LINE2_R (device_specific)56: Sense (device_specific)67: FAUDIO_JD (device_specific)78: No Pin (not_connected)89: LINE2_L (device_specific)910: Sense (device_specific)10powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
GIGABYTE B550 AORUS ELITE (AX) F_AUDIO (High Definition audio) — source-scoped contact map
PinSignalWhat it doesStatus
1MIC2_LControl, detection or configuration connection; check the source and device.Device-specific
Sources
2GNDGround reference and return.Device-specific
Sources
3MIC2_RControl, detection or configuration connection; check the source and device.Device-specific
Sources
4NCNot connected or absent in this named wiring.Not connected
Sources
5LINE2_RControl, detection or configuration connection; check the source and device.Device-specific
Sources
6SenseControl, detection or configuration connection; check the source and device.Device-specific
Sources
7FAUDIO_JDControl, detection or configuration connection; check the source and device.Device-specific
Sources
8No PinNot connected or absent in this named wiring.Not connected
Sources
9LINE2_LControl, detection or configuration connection; check the source and device.Device-specific
Sources
10SenseControl, detection or configuration connection; check the source and device.Device-specific
Sources
Sources (1)

Intel FPIO Design Guide rev 1.1 legacy (AC'97-style) front-panel audio header

View and evidence limits

Per Table 2-5.

  • P346 HD Audio 2x5 header — **Agree** for MSI; **partial across Intel variants** — Different MSI manuals agree on all ten positions, including pin 4 NC. B's Intel Thin Mini-ITX HD Audio table assigns 4 PRESENCE# and supplies Intel HD Audio evidence absent in A. A's older Intel FPIO legacy-audio table and B's passive AC'97 table are distinct implementations. A's contradictory legacy pins 2/4 stay unverified; B's reserved passive pin 7 stays unverified. No shared document across passes.
  • This is NOT the HD Audio assignment; it is recorded separately because it is the only Intel-published front-panel audio table retrieved. Do not merge with the HD Audio variants.
  • Intel's HD Audio front-panel header table (in older FPIO editions, e.g. v1.3 2005, or Intel desktop board TPS documents) was not found on an Intel host; only mirrors were located and not used. Intel's own HD Audio signal names are therefore unverified.
  • Intel FPIO rev 1.1 header Table 2-5 has pin 2 AUD_GND / pin 4 AUD_VCC, but cable Table 4-1 has pin 2 AUD_VCC / pin 4 AUD_GND; those two rows are marked unverified.
HD Audio front-panel 2x5 header (Intel) engineering referencePer Table 2-5.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: AUD_MIC (single_source)12: Not confirmed (unverified)23: AUD_MIC_BIAS (single_source)34: Not confirmed (unverified)45: AUD_FPOUT_R (single_source)56: AUD_RET_R (single_source)67: HP_ON (single_source)78: KEY (not_connected)89: AUD_FPOUT_L (single_source)910: AUD_RET_L (single_source)10powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Intel FPIO Design Guide rev 1.1 legacy (AC'97-style) front-panel audio header — source-scoped contact map
PinSignalWhat it doesStatus
1AUD_MICControl, detection or configuration connection; check the source and device.Single source
Sources
2Not confirmedNo settled assignment. Do not wire from this row.Unverified
Sources
3AUD_MIC_BIASControl, detection or configuration connection; check the source and device.Single source
Sources
4Not confirmedNo settled assignment. Do not wire from this row.Unverified
Sources
5AUD_FPOUT_RControl, detection or configuration connection; check the source and device.Single source
Sources
6AUD_RET_RControl, detection or configuration connection; check the source and device.Single source
Sources
7HP_ONControl, detection or configuration connection; check the source and device.Single source
Sources
8KEYNot connected or absent in this named wiring.Not connected
Sources
9AUD_FPOUT_LControl, detection or configuration connection; check the source and device.Single source
Sources
10AUD_RET_LControl, detection or configuration connection; check the source and device.Single source
Sources
Sources (1)

Intel Thin Mini-ITX HD Audio

View and evidence limits

Intel Figure 2-5 board-header illustration as printed: absent position 8 is the upper contact in column four of five. Cable face versus wire-entry view is not explicitly labeled.

  • P346 HD Audio 2x5 header — **Agree** for MSI; **partial across Intel variants** — Different MSI manuals agree on all ten positions, including pin 4 NC. B's Intel Thin Mini-ITX HD Audio table assigns 4 PRESENCE# and supplies Intel HD Audio evidence absent in A. A's older Intel FPIO legacy-audio table and B's passive AC'97 table are distinct implementations. A's contradictory legacy pins 2/4 stay unverified; B's reserved passive pin 7 stays unverified. No shared document across passes.
  • Nominal 2.54 mm pitch applies to this guide.
  • Passive AC’97 pin 7 has no usable function. Actual detection behavior, other boards/pitches, proprietary harnesses and cable-rear numeric layouts are unverified.
HD Audio front-panel 2x5 header (Intel) engineering referenceIntel Figure 2-5 board-header illustration as printed: absent position 8 is the upper contact in column four of five. Cable face versus wire-entry view is not explicitly labeled.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: PORT 1L (single_source)12: GND (single_source)23: PORT 1R (single_source)34: PRESENCE# (single_source)45: PORT 2R (single_source)56: SENSE1 RETURN (single_source)67: SENSE SEND (single_source)78: KEY (not_connected)89: PORT 2L (single_source)910: SENSE2 RETURN (single_source)10powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Intel Thin Mini-ITX HD Audio — source-scoped contact map
PinSignalWhat it doesStatus
1PORT 1LControl, detection or configuration connection; check the source and device.Single source
Sources
2GNDGround reference and return.Single source
Sources
3PORT 1RControl, detection or configuration connection; check the source and device.Single source
Sources
4PRESENCE#Control, detection or configuration connection; check the source and device.Single source
Sources
5PORT 2RControl, detection or configuration connection; check the source and device.Single source
Sources
6SENSE1 RETURNControl, detection or configuration connection; check the source and device.Single source
Sources
7SENSE SENDControl, detection or configuration connection; check the source and device.Single source
Sources
8KEYNot connected or absent in this named wiring.Not connected
Sources
9PORT 2LControl, detection or configuration connection; check the source and device.Single source
Sources
10SENSE2 RETURNControl, detection or configuration connection; check the source and device.Single source
Sources
Sources (1)

Intel Thin Mini-ITX passive AC’97

View and evidence limits

Intel Figure 2-5 board-header illustration as printed: absent position 8 is the upper contact in column four of five. Cable face versus wire-entry view is not explicitly labeled.

  • P346 HD Audio 2x5 header — **Agree** for MSI; **partial across Intel variants** — Different MSI manuals agree on all ten positions, including pin 4 NC. B's Intel Thin Mini-ITX HD Audio table assigns 4 PRESENCE# and supplies Intel HD Audio evidence absent in A. A's older Intel FPIO legacy-audio table and B's passive AC'97 table are distinct implementations. A's contradictory legacy pins 2/4 stay unverified; B's reserved passive pin 7 stays unverified. No shared document across passes.
  • Table 2-5 retains PRESENCE# at pin 4 despite its Passive AC’97 title. This exact guide-specific assignment is preserved, not generalized to every AC’97 implementation.
  • Passive AC’97 pin 7 has no usable function. Actual detection behavior, other boards/pitches, proprietary harnesses and cable-rear numeric layouts are unverified.
HD Audio front-panel 2x5 header (Intel) engineering referenceIntel Figure 2-5 board-header illustration as printed: absent position 8 is the upper contact in column four of five. Cable face versus wire-entry view is not explicitly labeled.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: MIC (single_source)12: AUD_GND (single_source)23: MIC_BIAS (single_source)34: PRESENCE# (single_source)45: FP_OUT_R (single_source)56: AUD_GND (single_source)67: Not confirmed (unverified)78: KEY (not_connected)89: FP_OUT_L (single_source)910: AUD_GND (single_source)10powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Intel Thin Mini-ITX passive AC’97 — source-scoped contact map
PinSignalWhat it doesStatus
1MICControl, detection or configuration connection; check the source and device.Single source
Sources
2AUD_GNDControl, detection or configuration connection; check the source and device.Single source
Sources
3MIC_BIASControl, detection or configuration connection; check the source and device.Single source
Sources
4PRESENCE#Control, detection or configuration connection; check the source and device.Single source
Sources
5FP_OUT_RControl, detection or configuration connection; check the source and device.Single source
Sources
6AUD_GNDControl, detection or configuration connection; check the source and device.Single source
Sources
7Not confirmedNo settled assignment. Do not wire from this row.Unverified
Sources
8KEYNot connected or absent in this named wiring.Not connected
Sources
9FP_OUT_LControl, detection or configuration connection; check the source and device.Single source
Sources
10AUD_GNDControl, detection or configuration connection; check the source and device.Single source
Sources
Sources (1)

MSI B550-A PRO JAUD1

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

MSI p.33 board drawing: 2 upper left, 10 upper right, 1 lower left, 9 lower right; absent 8 in upper row. Cable rear not established.

  • P346 HD Audio 2x5 header — **Agree** for MSI; **partial across Intel variants** — Different MSI manuals agree on all ten positions, including pin 4 NC. B's Intel Thin Mini-ITX HD Audio table assigns 4 PRESENCE# and supplies Intel HD Audio evidence absent in A. A's older Intel FPIO legacy-audio table and B's passive AC'97 table are distinct implementations. A's contradictory legacy pins 2/4 stay unverified; B's reserved passive pin 7 stays unverified. No shared document across passes.
  • MSI pin 4 is NC while Intel HD Audio pin 4 is PRESENCE#. They remain separate.
  • Passive AC’97 pin 7 has no usable function. Actual detection behavior, other boards/pitches, proprietary harnesses and cable-rear numeric layouts are unverified.
HD Audio front-panel 2x5 header (Intel) engineering referenceMSI p.33 board drawing: 2 upper left, 10 upper right, 1 lower left, 9 lower right; absent 8 in upper row. Cable rear not established.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: MIC L (device_specific)12: Ground (device_specific)23: MIC R (device_specific)34: NC (not_connected)45: Head Phone R (device_specific)56: MIC Detection (device_specific)67: SENSE_SEND (device_specific)78: No Pin (not_connected)89: Head Phone L (device_specific)910: Head Phone Detection (device_specific)10powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
MSI B550-A PRO JAUD1 — source-scoped contact map
PinSignalWhat it doesStatus
1MIC LControl, detection or configuration connection; check the source and device.Device-specific
Sources
2GroundGround reference and return.Device-specific
Sources
3MIC RControl, detection or configuration connection; check the source and device.Device-specific
Sources
4NCNot connected or absent in this named wiring.Not connected
Sources
5Head Phone RControl, detection or configuration connection; check the source and device.Device-specific
Sources
6MIC DetectionControl, detection or configuration connection; check the source and device.Device-specific
Sources
7SENSE_SENDControl, detection or configuration connection; check the source and device.Device-specific
Sources
8No PinNot connected or absent in this named wiring.Not connected
Sources
9Head Phone LControl, detection or configuration connection; check the source and device.Device-specific
Sources
10Head Phone DetectionControl, detection or configuration connection; check the source and device.Device-specific
Sources
Sources (1)

Important boundary

This reference establishes only the specific manufacturer-documented family and example noted in the sources. It does not verify an arbitrary mating pair, cable orientation, electrical rating or device combination. Stop and consult original documents for the exact products.

Source-scoped V142 recognition check

MSI B550-A PRO JAUD1. Two rows with an internal gap, not the USB row-end gap in the same manual. A front-panel audio role, not a USB role. Find the audio header designation and the case audio-harness documentation. Still unresolved: AC’97 alternatives, proprietary audio harnesses and exact mating dimensions. See the internal-header field reference for source revision, observation limits and the comparison.

Your next step

Move from the form to the requirement.

Read the engineering reference Source-scoped details, orientation and explicit unknowns.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

Back to first citation ↑
C346ASource checked · pending review

Intel’s Thin Mini-ITX front-panel audio figure documents a 2×5, 2.54 mm header with position 8 absent.

Intel · Thin Mini-ITX Based PC System Design Guide, Revision 1.2 ↗

Locator: PDF page 21, §2.3.1 Fig 2-5 HD Audio 2x5 key at pin 8; page 24, §2.5.1 Fig 2-8 dual USB 2x5 key at pin 9; p25 alternate double-key variant
Access: public pdf text. Original paraphrase of figures inspected visually. No Intel diagrams, pinout tables or copyrighted screenshots redistributed.

S456: full source recordInspect review dependencies → (private workspace)

Claim scope: Manufacturer-specific family/physical identification only. No inferred device wiring, mating verification or installation approval.. Next review due 2027-01-07.

Back to first citation ↑
C346BSource checked · pending review

Intel NUC 9 documentation separately specifies a similar 2×5 audio header with the same position 8 absent but a 2.0 mm pitch: the exact platform matters.

Intel · Intel NUC 9 Extreme/Pro Technical Product Specification ↗

Locator: PDF page 28, §2.15.1 A — 2x5 audio header, 2.0mm pitch, pin 8 key
Access: public pdf text. NUC 9 specific; not a basis for wiring arbitrary HD Audio headers or merging footprint types.

S457: full source recordInspect review dependencies → (private workspace)

Claim scope: Manufacturer-specific family/physical identification only. No inferred device wiring, mating verification or installation approval.. Next review due 2027-01-07.

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C346CSource checked · pending review

B550-A PRO identifies JAUD1 as the front-panel audio-jack connector.

MSI · MSI B550-A PRO User Guide, version 6.0 (2024/02) ↗

Locator: PDF pp.33, 36–38, 40–41; p.59 / printed ix revision history. Source diagrams visually inspected at zero-based pages 32,35,36,37,39,40,58.
Access: public pdf text. Observed document is not a real-hardware inspection, installed-device approval, wiring guide, current revision guarantee or manufacturing specification.

S591: full source recordInspect review dependencies → (private workspace)

Claim scope: V142: named MSI B550-A PRO manual version 6.0 (2024/02) or explicitly identified Noctua family only. Role/recognition evidence, not generic wiring, safe mating, pinout approval, dimensions or installed-device certification.. Next review due 2027-01-11.

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C346DSource checked · pending review

JAUD1’s table distinguishes absent position 8 from unconnected position 4.

MSI · MSI B550-A PRO User Guide, version 6.0 (2024/02) ↗

Locator: PDF pp.33, 36–38, 40–41; p.59 / printed ix revision history. Source diagrams visually inspected at zero-based pages 32,35,36,37,39,40,58.
Access: public pdf text. Observed document is not a real-hardware inspection, installed-device approval, wiring guide, current revision guarantee or manufacturing specification.

S591: full source recordInspect review dependencies → (private workspace)

Claim scope: V142: named MSI B550-A PRO manual version 6.0 (2024/02) or explicitly identified Noctua family only. Role/recognition evidence, not generic wiring, safe mating, pinout approval, dimensions or installed-device certification.. Next review due 2027-01-11.

Back to first citation ↑
C346ESource checked · pending review

The JAUD1 table includes microphone/headphone detection functions; it is not a USB signal table.

MSI · MSI B550-A PRO User Guide, version 6.0 (2024/02) ↗

Locator: PDF pp.33, 36–38, 40–41; p.59 / printed ix revision history. Source diagrams visually inspected at zero-based pages 32,35,36,37,39,40,58.
Access: public pdf text. Observed document is not a real-hardware inspection, installed-device approval, wiring guide, current revision guarantee or manufacturing specification.

S591: full source recordInspect review dependencies → (private workspace)

Claim scope: V142: named MSI B550-A PRO manual version 6.0 (2024/02) or explicitly identified Noctua family only. Role/recognition evidence, not generic wiring, safe mating, pinout approval, dimensions or installed-device certification.. Next review due 2027-01-11.

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Evidence behind this page

Scope first. Source second. Approval separate.

3 linked sources · 5 scoped claims · 0 sources with inspection/access flags.

Page scope: evidence_first_v103_pc_and_jst

Assessment 2026-10-22 · earliest scheduled source review 2027-01-07. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 3 source scopes, access limits and dates

S456 · Thin Mini-ITX Based PC System Design Guide, Revision 1.2

Intel · Manufacturer / product-owner domain · inspected 2026-10-09 · due 2027-01-07

Within inspection window

Scoped support: Explicit Intel Thin Mini-ITX examples, both documented as nominal 2.54 mm headers; not universal to all motherboards.

Not established / limitations: Original paraphrase of figures inspected visually. No Intel diagrams, pinout tables or copyrighted screenshots redistributed.

Locator: PDF page 21, §2.3.1 Fig 2-5 HD Audio 2x5 key at pin 8; page 24, §2.5.1 Fig 2-8 dual USB 2x5 key at pin 9; p25 alternate double-key variant

S457 · Intel NUC 9 Extreme/Pro Technical Product Specification

Intel · Manufacturer / product-owner domain · inspected 2026-10-09 · due 2027-01-07

Within inspection window

Scoped support: Counterexample: similar HD-audio keyed header can differ in nominal pitch by device family.

Not established / limitations: NUC 9 specific; not a basis for wiring arbitrary HD Audio headers or merging footprint types.

Locator: PDF page 28, §2.15.1 A — 2x5 audio header, 2.0mm pitch, pin 8 key

S591 · MSI B550-A PRO User Guide, version 6.0 (2024/02)

MSI · Unclassified publisher domain · inspected 2026-10-13 · due 2027-01-11

Within inspection window

Scoped support: Named B550-A PRO board header identities, diagram-level contact/key arrangements, control modes and RGB mismatch warnings.

Not established / limitations: Observed document is not a real-hardware inspection, installed-device approval, wiring guide, current revision guarantee or manufacturing specification.

Locator: PDF pp.33, 36–38, 40–41; p.59 / printed ix revision history. Source diagrams visually inspected at zero-based pages 32,35,36,37,39,40,58.

Trace 5 claims to their source records

C346A · P346

Intel’s Thin Mini-ITX front-panel audio figure documents a 2×5, 2.54 mm header with position 8 absent.

Claim scope: Manufacturer-specific family/physical identification only. No inferred device wiring, mating verification or installation approval.

Source links: S456 · Evidence trail → (private workspace)

C346B · P346

Intel NUC 9 documentation separately specifies a similar 2×5 audio header with the same position 8 absent but a 2.0 mm pitch: the exact platform matters.

Claim scope: Manufacturer-specific family/physical identification only. No inferred device wiring, mating verification or installation approval.

Source links: S457 · Evidence trail → (private workspace)

C346C · P346

B550-A PRO identifies JAUD1 as the front-panel audio-jack connector.

Claim scope: V142: named MSI B550-A PRO manual version 6.0 (2024/02) or explicitly identified Noctua family only. Role/recognition evidence, not generic wiring, safe mating, pinout approval, dimensions or installed-device certification.

Source links: S591 · Evidence trail → (private workspace)

C346D · P346

JAUD1’s table distinguishes absent position 8 from unconnected position 4.

Claim scope: V142: named MSI B550-A PRO manual version 6.0 (2024/02) or explicitly identified Noctua family only. Role/recognition evidence, not generic wiring, safe mating, pinout approval, dimensions or installed-device certification.

Source links: S591 · Evidence trail → (private workspace)

C346E · P346

The JAUD1 table includes microphone/headphone detection functions; it is not a USB signal table.

Claim scope: V142: named MSI B550-A PRO manual version 6.0 (2024/02) or explicitly identified Noctua family only. Role/recognition evidence, not generic wiring, safe mating, pinout approval, dimensions or installed-device certification.

Source links: S591 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.