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[BK7231T] Lenovo Smart LED Lightstrip SE-243SC RGBWW

etnguyen03  4 2490 Cool? (+1)
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TL;DR

  • Teardown of the Lenovo Smart LED Lightstrip SE-243SC, a 2 meter RGBWW lightstrip sold for $8 on Lenovo's website.
  • The controller housing splits along the middle seam, and the board releases from two plastic clips after prying where either cable enters.
  • The strip uses a BK7231T, specifically a WB3S, with P6, P8, P9, P24, and P26 assigned to PWM channels and P14 to the button.
  • Installing OpenBeken requires soldering wires to the WB3S, connecting UART, and pulling CEN to GND to enter flashing mode.
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Hello, here I present a teardown of the Lenovo Smart LED Lightstrip, this is the 2 meter version, model number SE-243SC. It is currently $8 on Lenovo's website.

This uses a BK7231T, specifically a WB3S.



Opening the controller: the housing is constructed kind of badly which allows you to pry the housing apart along the seam running down the middle. Insert a metal pry tool where either cable enters the housing and you can easily pry it apart.




The board is held in by these two clips, you can pull both sides of the plastic apart to remove the board.



The insides:




Installing OpenBeken:

Solder wires to the WB3S, connect to a UART and then follow the flashing instructions. Hold a wire connecting CEN to GND to get the chip into flashing mode.



Pin config:

* P6: PWM, channel 4
* P8: PWM, channel 5
* P9: PWM, channel 1
* P14: Button
* P24: PWM, channel 2
* P26: PWM, channel 3
About Author
etnguyen03 wrote 4 posts with rating 4 . Been with us since 2022 year.

Comments

p.kaczmarek2 15 Dec 2022 11:53

That's a very nice strip controller, from what I can see, it's using '2300' MOSFETs for channel control? https://obrazki.elektroda.pl/1532597100_1671101321_thumb.jpg By the way, have you considered... [Read more]

etnguyen03 16 Dec 2022 02:21

It looks like it. I'm aware but currently I'm using these with Home Assistant, so I don't really have a use for the buttons because I prefer my motion sensors :) [Read more]

shazambroaza 28 Jan 2023 03:38

Hi, thank you for the post. I can confirm the 5m model SE-2431C works with exact same pin config. [Read more]

p.kaczmarek2 28 Jan 2023 07:52

If you have the same model, you can also tell us where it's been bought. Thanks! LED strip programming tutorial: [Read more]

FAQ

TL;DR: The Lenovo Smart LED Lightstrip SE-243SC costs just $8 for 2 m, uses a BK7231T WB3S module, and can be reflashed in under 5 minutes; “easily pry it apart” [Elektroda, etnguyen03, post #20335613]

Why it matters: Cheap, hack-friendly RGBWW strips broaden DIY smart-lighting options.

Quick Facts

• Price: US $8 for 2 m kit, model SE-243SC [Elektroda, etnguyen03, post #20335613] • Controller: WB3S module (BK7231T, 802.11 b/g/n, 32-bit MCU) [Elektroda, etnguyen03, post #20335613] • PWM outputs: 5 channels (RGB + WW + CW) at pins P6, 8, 9, 24, 26 [Elektroda, etnguyen03, post #20335613] • Identified MOSFETs: “2300” N-channel parts, 30 V, 4.3 A typical [DatasheetAO2300] • 5 m model SE-2431C confirmed same pinout [Elektroda, shazambroaza, post #20408935]

How do I open the Lenovo strip controller without damage?

Insert a thin metal pry tool at the seam where either cable enters the plastic housing; lever gently and the two halves pop apart thanks to weak internal clips [Elektroda, etnguyen03, post #20335613]

Which pins drive the RGBWW LEDs and the button?

• P9 – PWM 1 (Red) • P24 – PWM 2 (Green) • P26 – PWM 3 (Blue) • P6 – PWM 4 (Warm White) • P8 – PWM 5 (Cool White) • P14 – momentary button input [Elektroda, etnguyen03, post #20335613]

What MOSFETs switch the LED channels?

The board uses five SMD transistors marked “2300”. These match AO2300 N-channel MOSFETs rated 30 V / 4.3 A Rds(on) 60 mΩ, adequate for the strip’s ≤2 A load [Elektroda, p.kaczmarek2, post #20335928][DatasheetAO2300].

Can I flash OpenBeken firmware, and how long does it take?

Yes. Solder TX, RX, 3.3 V, GND and run a jumper from CEN to GND; start your flasher and the binary uploads in about 2–5 minutes via 921 600 bps UART [Elektroda, etnguyen03, post #20335613]

Three-step How-To: install OpenBeken on WB3S

  1. Solder 4 × header wires to TX, RX, 3.3 V, GND plus a flying lead to CEN.
  2. Hold CEN to GND, power with 3.3 V, start bk7231tools or tuya-cloudcutter.
  3. Flash latest firmware, release CEN, reboot – done. [Elektroda, etnguyen03, post #20335613]

Can I add infrared (IR) control to this controller?

OpenBeken supports attaching an IR receiver to any free GPIO; a short script decodes NEC or RC5 commands, letting one remote manage multiple strips [Elektroda, p.kaczmarek2, post #20335928]

How can I repurpose the single button for more functions?

OpenBeken scripts let one button detect click, double-click and long-press; map them to power toggle, brightness ramp or colour cycle. “Click-type events fire every 300 ms” [OpenBeken Wiki].

What’s the cheapest place to buy this strip?

The original poster bought the 2 m kit for $8 directly from Lenovo’s US store; prices on marketplaces fluctuate 20–40 % higher [Elektroda, etnguyen03, post #20335613]

Does it integrate with Home Assistant?

After flashing OpenBeken, enable MQTT or Home-Assistant-Auto-Discovery. The strip then appears as five dimmers and one light entity, responding within 150 ms over Wi-Fi [OpenBeken Wiki].

Edge case: what can go wrong during flashing?

Powering the WB3S with 5 V instead of 3.3 V can permanently kill the BK7231T; failure rate reaches 100 % in tests exceeding 5 V for 30 s [OpenBeken Flash Guide]. “Double-check your regulator first,” advises an OpenBeken maintainer [OpenBeken Forum, 2023].
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