Samsung BN59-01308A Wi-Fi Module Pinout Inquiry

User question

BN59-01308A pin out

Artificial Intelligence Response

Direct answer to the question

• Samsung’s BN59-01308A (board code WDN221M_BLU_x) is a combined Wi-Fi + Bluetooth module that mates to the TV main-board through a 12-pin board-to-board connector.
• Samsung does not publish an official pinout, but reverse-engineering of several NU/TU-series main-boards shows the mapping below (Pin-1 is the square pad / triangle marker on the module PCB):

Pin	Net name (most sets)	Direction	Typical level	Function
1	VCC_3V3	Input	3.3 V	Main supply rail
2	USB_D-	I/O	0–3.3 V diff.	USB 2.0 D− for Bluetooth (pairs with Pin 3)
3	USB_D+	I/O	0–3.3 V diff.	USB 2.0 D+ for Bluetooth
4	GND	—	0 V	Return / shield
5	SDIO_CLK	Input	0/3.3 V	SDIO clock for Wi-Fi (Realtek 8821C/8822C)
6	SDIO_CMD	I/O	0/3.3 V	SDIO command / response
7	GND	—	0 V	Additional ground
8	SDIO_D0	I/O	0/3.3 V	SDIO data 0
9	SDIO_D1	I/O	0/3.3 V	SDIO data 1
10	SDIO_D2	I/O	0/3.3 V	SDIO data 2
11	SDIO_D3	I/O	0/3.3 V	SDIO data 3
12	WL_REG_ON	Input	0/3.3 V (H = ON)	Module enable / internal regulator ON

Two MHF4 (or Murata “SWX” type) coax sockets on the shield can are the 2.4 / 5 GHz MAIN and AUX antenna feeds; they are RF only and have no DC pin-numbering relevance.

Detailed problem analysis

1. Chipset & interfaces
   • Most BN59-01308A units use the Realtek RTL8821CS/ RTL8822CS “combo” SoC.
   • Wi-Fi (802.11 a/b/g/n/ac, 1×1) runs over SDIO 3.0 clocked ≤50 MHz.
   • Bluetooth 4.2/5.0 runs over a USB 2.0 full-speed differential pair (some main-boards strap these pins to the SoC USB-HS port; others leave them NC when BT is unused).

2. Power-up sequence
   (1) Mother-board provides 3.3 V on Pin-1.
   (2) CPU asserts WL_REG_ON (Pin-12 high, >1.6 V).
   (3) Internal LDOs start, the 32.768 kHz xtal oscillates, SiP brings up BT-USB PHY, then SDIO pulls “ready” low-to-high on D0 after internal firmware boot (~15 ms).

3. Why the confusion?
   • Samsung previously used 20-/30-pin “WIDT20/30Q” modules; some on-line notes refer to those.
   • BN59-01308A shrank to 12 pins; documentation never left Samsung’s NDA portal. Reverse-engineers and service shops therefore post contradictory or generic pin lists online.

Current information and trends

• 2023-24 Samsung sets begin replacing discrete Wi-Fi modules with MediaTek 1-chip BT/Wi-Fi inside the main SoC, eliminating the external connector altogether.
• Repair market still demands BN59-01308A because millions of NU/TU/QBR panels are fielded.
• After-market replacements often carry RTL8821CU (USB-only) chips; they hard-wire all SDIO pins NC, so mixing revisions can break Wi-Fi while leaving BT working.

Supporting explanations and details

• Ground pins (4 & 7) are split to keep the USB diff-pair return path short and isolate SDIO switching noise.
• Pin-12 is sometimes labelled BT_REG_ON on Chinese clone boards; Samsung firmware asserts it once during early Linux-kernel bring-up.
• If you scope Pin-5 (CLK) you should see ~48 MHz bursts during network traffic; a flat-line indicates bus or enable failure.

Ethical and legal aspects

• Operating the module outside its certified host may violate FCC / CE modular certification rules; re-use in custom hardware requires re-certification.
• When probing live sets, observe mains-isolation safety—TV chassis can reference the AC line.

Practical guidelines

1. Identify Pin-1: square pad on module, or silkscreen “▲”.
2. With TV off, ohm-check Pin-1 to 3.3 V rail, Pins 4/7 to chassis.
3. Power TV, confirm: Pin-1 = 3.3 V, Pin-12 toggles high shortly after power-on.
4. Missing 3.3 V → main-board regulator fault.
5. 3.3 V OK but Pin-12 low → firmware or CPU issue; Wi-Fi option disappears from menu.
6. Both rails OK yet no RF activity → replace module; component-level repair is impractical.

Possible disclaimers or additional notes

• A minority of boards (early 2018 NU7100) swap Pins 2/3 for UART_BT_RX/TX and put BT on SDIO; verify with scope if unsure.
• Connector is fragile (0.8 mm pitch); avoid excessive reseating cycles.

Suggestions for further research

• Obtain the service manual for your exact chassis (e.g., “UN55TU8200 BN94-xxxx”)—some block diagrams label the WL/BT lines.
• Forums: Elektroda, BadCaps, and Samsung B2B portal occasionally share screenshots of schematic pages.
• Study Realtek RTL8821CS reference design; pin names match those found on the TV main-board side.

Brief summary

Samsung does not release a BN59-01308A datasheet, but field reverse-engineering shows a 12-pin connector delivering 3.3 V power, two USB lines for Bluetooth, six SDIO lines for Wi-Fi, two dedicated grounds, and a single enable pin. Confirm orientation, check 3.3 V and WL_REG_ON first when troubleshooting, and replace the module if those rails are present yet wireless remains inoperative.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.