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Disassembling and Flashing a Noname 9W GU10 Light with BK7231N and BP5758D Chips

kfpv 888 4
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  • #1 21229105
    kfpv
    Level 1  
    so i bought this cheap light from aliexpress, it's noname but 9w apparently. Here's the link https://nl.aliexpress.com/item/1005006770901732.html
    it's also identifiable as SD GU10 from the tuya app and the front of the box looks like this
    Front of the GU10 RGB+CCT smart bulb packaging.
    it's also gu10 mount and here's the markings
    LED bulb with GU10 fitting with inscriptions on the casing.

    disassembly is easy:
    1) pop off the plastic diffuser on top using something thin (a knife will do)
    2) slice the silicone around the white pcb to free it
    3) use something thin to lift the white pcb from the connector
    4) now the green pcb is reachable to be removed

    some pictures of the pcbs

    LED circuit board with LEDs in various colors on a wooden surface. Photo of a circuit board with electronic components. Close-up of a green printed circuit board with visible traces and solder points. Close-up of a circuit board with a CBL C5 module and a capacitor against a background of fingers.

    the bk7231n main chip is used and the bp5758d driver chip.

    i used this guide https://www.elektroda.com/rtvforum/topic4040714.html#20992092 for the cblc5 module's pinout, i hope it's ok to reupload it

    Close-up of CBLC5-BK7231N module with pin labels. CBL C5 module with BK7231N chip on a wooden surface. Pin labels and electronic components are visible.

    it's kind of possible to solder a serial converter to the module without desoldering it by first bending the capacitors away from it - then there's just enough space to fit a soldering iron in for the tx1 and rx1 pads. the underside of the pcb can be used for power:
    View of the back of a green printed circuit board with GND and 3V markings.

    connect to a serial converter (probably rx to tx, tx to rx, don't forget to set 3v logic and use 3v voltage output) and use the flash tool to flash it (bk7231n chip) https://github.com/openshwprojects/BK7231GUIFlashTool

    pin 24 is BP5758D_CLK and pin 26 is BP5758D_DAT
    led map (which can be set by launching the webapp and going to tools) looks like this
    LED map table showing light color assignments.

    aand it works!
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  • #2 21229225
    insmod
    Level 22  
    Another variant of this bulb, but with cblc5 instead of ln882h. And a little newer led module revision, but after a cursory glance, i didn't find any differences, save for the date.
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  • #3 21329297
    tech1977
    Level 8  
    Hi everyone,
    I recently discovered the fantastic OpenBeken firmware, until today I have used GU10 bulbs with WLED pre-flash to control with DDP protocol, now I would like to try OpenBeken with DDP, I bought these 9 watt bulbs
    https://it.aliexpress.com/item/1005006770901732.html
    can you help me with my first firmware flash?
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  • #4 21343556
    tech1977
    Level 8  
    I didn't understand if it is currently possible to flash with tuya-cloudcutter
    the firmware version of the bulb is 1.5.40

    Screenshot of an attempt to flash a device using tuya-cloudcutter.

    Thanks
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