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[CB3L/BK7231N] Tuya LSC Smart Ceiling Light RGBCW - Pinout and Teardown Photos

ferbulous 1191 8
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  • Helpful post
    #1 21156181
    ferbulous
    Level 18  
    [CB3L/BK7231N] LSC Smart Ceiling Light RGBCW

    Basic information:
    Brand: Tuya
    Model: sky-BK
    Chip: BK7231N [CB3L]
    Local Vendor: https://www.lazada.com.my/products/i4121986118-s23347431720.html
    Also bought from different stores, but they're all essentially the same hardware/box

    Teardown Photos:
    Box of a Tuya smart WiFi ceiling light, model LSC RGBCW. Tuya sky-BK smart ceiling lamp resting on a box. Interior of a smart ceiling lamp with visible LEDs and electronics. Image of an electronic module with BK7231N chip on an LSC ceiling lamp

    Pinout:

    CB3L/BK7231N module mounted on an LED lamp board with pin numbering marked.

    Code: text Expand Select all Copy to clipboard
    
{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "Full Device Name Here",
  "model": "enter short model name here",
  "chip": "BK7231N",
  "board": "TODO",
  "flags": "134484995",
  "keywords": [
    "TODO",
    "TODO",
    "TODO"
  ],
  "pins": {
    "6": "PWM;4",
    "7": "PWM;1",
    "8": "PWM;2",
    "9": "PWM;3",
    "24": "PWM;5"
  },
  "command": "",
  "image": "https://obrazki.elektroda.pl/YOUR_IMAGE.jpg",
  "wiki": "https://www.elektroda.com/rtvforum/topic_YOUR_TOPIC.html"
}


    Firmware Backup:
    readResult...-57-22.bin Download (2 MB)

    Comments:
    Anyway I'm having difficulty to desolder the chip with hot air off the LED plate, even with flux & extra solder added to the pads, I'd appreciate some advice to desolder it properly.
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  • #2 21156200
    divadiow
    Level 34  
    ferbulous wrote:
    Anyway I'm having difficulty to desolder the chip with hot air off the LED plate, even with flux & extra solder added to the pads, I'd appreciate some advice to desolder it properly.


    how come you want to desolder? it seems like you have already flashed it...

    Added after 6 [minutes]:

    boot log for that fw btw.

    Code: Text
    Log in, to see the code


    v1.5.32 = no cloudcutter.

    also against the key for this device Tuya's API gives a response that refers to this as:

    Code: Text
    Log in, to see the code


    there is currently only 1 other CB3L device in the device list
  • #3 21156205
    ferbulous
    Level 18  
    >>21156200
    It's usually easy to desolder chip but this is the first one that I have with the chip on the led plate.
    It's not budging even after 4 minutes of hot air with flux and I'm worried about damaging nearby components if I exposed them any longer.
    Btw, I'm using the default 360 C temperature for the hot air rework station
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  • #4 21156206
    divadiow
    Level 34  
    hmm OK. I think I'd suggest more pb solder, flux and faster swiitching between pad sides before it solidifies, but it sounds like you already know this method.

    Added after 3 [minutes]:

    but what will you do with the module once desoldered?
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  • #5 21156247
    p.kaczmarek2
    Moderator Smart Home  
    Are you using flux to desolder the chip?

    Have you tried adding Pb solder to the pads?
    Helpful post? Buy me a coffee.
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  • #6 21158074
    ferbulous
    Level 18  
    divadiow wrote:
    also against the key for this device Tuya's API gives a response that refers to this as:


    Btw, how do you use this key with tuya api to get that info?

    divadiow wrote:
    but what will you do with the module once desoldered?

    Swapping it with esp for tasmesh, i need something that works when I’m using lights with detached mode if wifi goes offline

    p.kaczmarek2 wrote:
    Are you using flux to desolder the chip?

    Have you tried adding Pb solder to the pads?


    Trid adding flux and solder, but didn’t really work for me
    I actually ended up ripping the pads for the first ceiling light. Was able to get it working again by etching off some of the copper trace to the pad and solder wires to the chip

    divadiow wrote:
    there is currently only 1 other CB3L device in the device list


    Apparently it’s placeholder for cb3s but they used cb3L

    Close-up of the inside of a lighting module with a visible PCB and electronic components, such as a capacitor, LEDs, and a CB3S chip.
  • #7 21177524
    p.kaczmarek2
    Moderator Smart Home  
    I think this method can work for any device:
    Extracting DpIDs for TUYA MCU devices

    Don't be impatient, if you rip pads, it just means that you should have let it heat up a bit longer.
    Helpful post? Buy me a coffee.
  • #8 21177988
    ferbulous
    Level 18  
    @p.kaczmarek2
    I usually get it done under a minute, but when it’s 3 minutes and it’s still not budging even with added solder and flux. I need to stop right there

    Might need to use this method next time with copper wire on both sides of the pads

    https://youtu.be/xMXJTLWyBCo?si=RFNfWYUDRIZTz13b
  • #9 21178078
    p.kaczmarek2
    Moderator Smart Home  
    Related trick: https://www.youtube.com/shorts/fTM7tEtN7_0
    Helpful post? Buy me a coffee.
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Topic summary

The discussion revolves around the Tuya LSC Smart Ceiling Light RGBCW, specifically focusing on the BK7231N chip and the challenges faced during desoldering. Users share their experiences with desoldering techniques, including the use of hot air rework stations, flux, and additional solder. One user encountered difficulties desoldering the chip from the LED plate, leading to concerns about damaging nearby components. Suggestions include using more lead-based solder and flux, as well as techniques to avoid ripping pads. The conversation also touches on extracting DpIDs for Tuya MCU devices and the potential for using the module with ESP for tasmesh functionality. Teardown photos and pinout diagrams are provided for reference.
Summary generated by the language model.
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