E342 · Source-scoped pinout variants

5 V addressable RGB header (MSI JRAINBOW) engineering reference

Named wiring from the pinout research; connector shape alone does not establish capabilities.

Open field note Source trail

Source checked · no independent review claimed · Fabrication approved: no

5 V addressable RGB header (MSI JRAINBOW) engineering reference original orientation schematic — Original pinout diagram; read the exact variant and view below. Not to scale.

Contact count

Not asserted

Source-scoped connector interface

Mating boundary

Shape is not the verdict.

Check the exact device and mating connector.

Orientation

How to read this profile

Read the exact variant view convention. Schematic layouts do not establish physical positions.

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
Nominal contacts	3 (MSI JRAINBOW)S458Recorded 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.
Positions / cavity span	4 (Claim C348D); 4 (MSI B550-A PRO four-position span, position 3 absent); 4 (MSI B550-A PRO JRAINBOW1–2)S591 · S757Separate exact examples; retain each value’s source, role, axis and part 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. Exact named example MSI B550-A PRO JRAINBOW1–2: Device-specific5V addressable RGB header. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. No universalARGBpitch, wire-sideview or specimenmarkings inferred.
Populated contacts	3 (MSI JRAINBOW, positions 1/2/4); 3 (MSI B550-A PRO JRAINBOW1–2)S458 · S757Separate exact examples; retain each value’s source, role, axis and part scope. Manufacturer-specific family/physical identification only. No inferred device wiring, mating verification or installation approval. Exact named example MSI B550-A PRO JRAINBOW1–2: Device-specific5V addressable RGB header. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. No universalARGBpitch, wire-sideview or specimenmarkings inferred.
Contact rows	1 (MSI B550-A PRO JRAINBOW1–2)S757Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example MSI B550-A PRO JRAINBOW1–2: Device-specific5V addressable RGB header. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. No universalARGBpitch, wire-sideview or specimenmarkings inferred.
Connector role	header (MSI JRAINBOW)S458Recorded 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.
Mounting	board (Claim C348A)S458Recorded 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.
Keying / polarization	absent position 3 (MSI B550-A PRO JRAINBOW)S591Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. 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.
Manufacturer	MSI (B550-A PRO JRAINBOW1-2)S591Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. 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.
Series	JRAINBOW (B550-A PRO JRAINBOW1-2)S591Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. 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.
Exact part / implementation	B550-A PRO JRAINBOW1-2 (B550-A PRO JRAINBOW1-2)S591Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. 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.
View convention	MSI p.41 numbered header sketch, pin1left; row positions1,2and4occupied, position3absent; do not renumber the gap. (MSI B550-A PRO JRAINBOW1–2)S757Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example MSI B550-A PRO JRAINBOW1–2: Device-specific5V addressable RGB header. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. No universalARGBpitch, wire-sideview or specimenmarkings inferred.

Not recorded: Contact pitch, Dimensions / axis, Contact gender / arrangement, 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 JRAINBOW1~2: Per manual.
GIGABYTE B550 AORUS ELITE (AX) D_LED1/D_LED2 (comparable 5 V ARGB header, not MSI): Per manual.
MSI B550-A PRO JRAINBOW1–2: MSI p.41 JRAINBOW1–2 board sketch: four numbered positions, pin 1 left, position 3 absent, pin 4 right. Three contacts occupy 1, 2 and 4; the gap is not renumbered.

Report a correction to these facts →

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.

Dark pinout view

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 variantMSI MAG B550 TOMAHAWK JRAINBOW1~2

MSI MAG B550 TOMAHAWK JRAINBOW1~2

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

View and evidence limits

Per manual.

P348 MSI JRAINBOW — **Agree**: 1 +5 V, 2 data, position 3 absent, 4 ground — Different MSI board manuals, plus GIGABYTE D_LED in A. Preserve the missing position instead of renumbering the three contacts 1-3.
MSI: up to 75 WS2812B LEDs, max 3 A at 5 V.
Only one MSI manual was read. The mating 3-wire plug numbering is not separately documented.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

MSI MAG B550 TOMAHAWK JRAINBOW1~2 — source-scoped contact map
Pin	Signal	What it does	Status
1	+5V	Power connection (+5V). Check the specified supply.	Device-specific Sources
2	Data	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
3	No Pin	Not connected or absent in this named wiring.	Not connected Sources
4	Ground	Ground reference and return.	Device-specific Sources

Sources (1)

S761 · Micro-Star International (MSI) · MAG B550 TOMAHAWK Motherboard User Guide (multilingual)
No revision printed; PDF creation date 2023-12-26 (file MAGB550TOMAHAWK.pdf) · English section, 'JRAINBOW1~2: Addressable RGB LED connectors' table, printed p. 27

GIGABYTE B550 AORUS ELITE (AX) D_LED1/D_LED2 (comparable 5 V ARGB he…

GIGABYTE B550 AORUS ELITE (AX) D_LED1/D_LED2 (comparable 5 V ARGB header, not MSI)

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

View and evidence limits

Per manual.

P348 MSI JRAINBOW — **Agree**: 1 +5 V, 2 data, position 3 absent, 4 ground — Different MSI board manuals, plus GIGABYTE D_LED in A. Preserve the missing position instead of renumbering the three contacts 1-3.
GIGABYTE: max 5 A at 5 V, up to 1000 LEDs.
Only one MSI manual was read. The mating 3-wire plug numbering is not separately documented.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

GIGABYTE B550 AORUS ELITE (AX) D_LED1/D_LED2 (comparable 5 V ARGB header, not MSI) — source-scoped contact map
Pin	Signal	What it does	Status
1	V (5V)	Power connection (V (5V)). Check the specified supply.	Device-specific Sources
2	Data	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
3	No Pin	Not connected or absent in this named wiring.	Not connected Sources
4	GND	Ground reference and return.	Device-specific Sources

Sources (1)

S762 · GIGA-BYTE Technology · B550 AORUS ELITE / B550 AORUS ELITE AX User's Manual
Rev. 1002, 12ME-B55AELT-1002R (copyright 2020) · Chapter 1, item 7) D_LED1/D_LED2 (Addressable LED Strip Headers), printed p. 16

MSI B550-A PRO JRAINBOW1–2

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

View and evidence limits

MSI p.41 JRAINBOW1–2 board sketch: four numbered positions, pin 1 left, position 3 absent, pin 4 right. Three contacts occupy 1, 2 and 4; the gap is not renumbered.

P348 MSI JRAINBOW — **Agree**: 1 +5 V, 2 data, position 3 absent, 4 ground — Different MSI board manuals, plus GIGABYTE D_LED in A. Preserve the missing position instead of renumbering the three contacts 1-3.
MSI describes WS2812B 5V/Data/Ground strips and a 3 A at 5 V limit. Its warning says a 5 V strip can be damaged on JRGB.
Other three-contact arrangements, detailed data waveforms, cable-rear numbering and arbitrary LED compatibility are unverified.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

MSI B550-A PRO JRAINBOW1–2 — source-scoped contact map
Pin	Signal	What it does	Status
1	+5V	Power connection (+5V). Check the specified supply.	Device-specific Sources
2	Data	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
3	No Pin	Not connected or absent in this named wiring.	Not connected Sources
4	Ground	Ground reference and return.	Device-specific Sources

Sources (1)

S757 · Micro-Star International (MSI) · B550-A PRO User Guide
Version 6.0, 2024/02, First release (Revision History, PDF p.59) · printed/PDF p.41, JRAINBOW1~2: Addressable RGB LED connectors, numbered drawing and Pin/Signal Name table

Unknowns stay unknown.

Check the exact device manual before wiring or applying power.

Your next step

Use the detail without guessing past its limits.

Read the connector field note Recognition clues and practical checks.Work through a connection Keep exact equipment and cable requirements separate.

Source trail

Claims and sources

C811Asource checked

MSI MAG B550 TOMAHAWK JRAINBOW1~2: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Micro-Star International (MSI) · MAG B550 TOMAHAWK Motherboard User Guide (multilingual) ↗
English section, 'CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors', PWM Mode and DC Mode pin definition tables, printed p. 23; English section, 'CPU_PWR1, ATX_PWR1: Power Connectors', CPU_PWR1 table, printed p. 20; English section, 'JAUD1: Front Audio Connector' table, printed p. 19; English section, 'JRAINBOW1~2: Addressable RGB LED connectors' table, printed p. 27; English section, 'JRGB1~2: RGB LED connectors' table, printed p. 26; English section, 'JUSB1~2: USB 2.0 Connectors' table, printed p. 22; English section, Overview of Components, 'CPU_PWR1, ATX_PWR1: Power Connectors', ATX_PWR1 table, printed p. 20 · Source scope and unresolved evidence are preserved in the engineering variant.

C811Bsource checked

GIGABYTE B550 AORUS ELITE (AX) D_LED1/D_LED2 (comparable 5 V ARGB header, not MSI): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

GIGA-BYTE Technology · B550 AORUS ELITE / B550 AORUS ELITE AX User's Manual ↗
Chapter 1, item 1/2) ATX_12V/ATX, 'ATX:' pin table, printed p. 15; Chapter 1, item 1/2) ATX_12V/ATX, 'ATX_12V:' pin table, printed p. 15; Chapter 1, item 12) F_AUDIO (Front Panel Audio Header), High Definition audio table, printed p. 19; Chapter 1, item 14) F_USB1/F_USB2 (USB 2.0/1.1 Headers) table, printed p. 20; Chapter 1, item 3/4) CPU_FAN/SYS_FAN1/2/3 (Fan Headers) pin table, printed p. 15; item 5) CPU_OPT, printed p. 16; Chapter 1, item 7) D_LED1/D_LED2 (Addressable LED Strip Headers), printed p. 16; Chapter 1, item 8) LED_C1/LED_C2 (RGB LED Strip Headers), printed p. 17; item 6) LED_CPU, printed p. 16 · Source scope and unresolved evidence are preserved in the engineering variant.

C811Csource checked

MSI B550-A PRO JRAINBOW1–2: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Micro-Star International (MSI) · B550-A PRO User Guide ↗
printed/PDF p.33, JAUD1: Front Audio Connector, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, ATX_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.37, JUSB1~2: USB 2.0 Connectors, numbered drawing and Pin/Signal Name table; printed/PDF p.38, CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors, PWM Mode and DC Mode pin definition tables and mode explanation, numbered drawing and Pin/Signal Name table; printed/PDF p.40, JRGB1: RGB LED connector, numbered drawing and Pin/Signal Name table; printed/PDF p.41, JRAINBOW1~2: Addressable RGB LED connectors, numbered drawing and Pin/Signal Name table · Source scope and unresolved evidence are preserved in the engineering variant.

3 source records support this profile. No independent engineering review or hardware validation is claimed.

Evidence behind this page

Scope first. Source second. Approval separate.

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

Page scope: Original schematic; not to scale and not fabrication approval.

Assessment 2026-10-22 · earliest scheduled source review 2027-01-18. 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

S757 · B550-A PRO User Guide

Micro-Star International (MSI) · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: printed/PDF p.33, JAUD1: Front Audio Connector, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, ATX_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.37, JUSB1~2: USB 2.0 Connectors, numbered drawing and Pin/Signal Name table; printed/PDF p.38, CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors, PWM Mode and DC Mode pin definition tables and mode explanation, numbered drawing and Pin/Signal Name table; printed/PDF p.40, JRGB1: RGB LED connector, numbered drawing and Pin/Signal Name table; printed/PDF p.41, JRAINBOW1~2: Addressable RGB LED connectors, numbered drawing and Pin/Signal Name table

S761 · MAG B550 TOMAHAWK Motherboard User Guide (multilingual)

Micro-Star International (MSI) · Unclassified publisher domain · inspected 2026-10-20 · due 2027-01-18

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: English section, 'CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors', PWM Mode and DC Mode pin definition tables, printed p. 23; English section, 'CPU_PWR1, ATX_PWR1: Power Connectors', CPU_PWR1 table, printed p. 20; English section, 'JAUD1: Front Audio Connector' table, printed p. 19; English section, 'JRAINBOW1~2: Addressable RGB LED connectors' table, printed p. 27; English section, 'JRGB1~2: RGB LED connectors' table, printed p. 26; English section, 'JUSB1~2: USB 2.0 Connectors' table, printed p. 22; English section, Overview of Components, 'CPU_PWR1, ATX_PWR1: Power Connectors', ATX_PWR1 table, printed p. 20

S762 · B550 AORUS ELITE / B550 AORUS ELITE AX User's Manual

GIGA-BYTE Technology · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: Chapter 1, item 1/2) ATX_12V/ATX, 'ATX:' pin table, printed p. 15; Chapter 1, item 1/2) ATX_12V/ATX, 'ATX_12V:' pin table, printed p. 15; Chapter 1, item 12) F_AUDIO (Front Panel Audio Header), High Definition audio table, printed p. 19; Chapter 1, item 14) F_USB1/F_USB2 (USB 2.0/1.1 Headers) table, printed p. 20; Chapter 1, item 3/4) CPU_FAN/SYS_FAN1/2/3 (Fan Headers) pin table, printed p. 15; item 5) CPU_OPT, printed p. 16; Chapter 1, item 7) D_LED1/D_LED2 (Addressable LED Strip Headers), printed p. 16; Chapter 1, item 8) LED_C1/LED_C2 (RGB LED Strip Headers), printed p. 17; item 6) LED_CPU, printed p. 16

Trace 3 claims to their source records

C811A · P348

MSI MAG B550 TOMAHAWK JRAINBOW1~2: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S761 · Evidence trail → (private workspace)

C811B · P348

GIGABYTE B550 AORUS ELITE (AX) D_LED1/D_LED2 (comparable 5 V ARGB header, not MSI): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S762 · Evidence trail → (private workspace)

C811C · P348

MSI B550-A PRO JRAINBOW1–2: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S757 · Evidence trail → (private workspace)

Prepare this page for review →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.