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[BK7231N/CBU]&[ESP32] Teardown HDMI Sync Box from Action - interior and circuit analysis

Dark Man 7485 36

TL;DR

  • Teardown of Action’s HDMI sync box with light strip, model 6204000100, aimed at Ambilight-style TV backlighting.
  • Inside sit BK7231N/CBU, ESP32-D0WD-V3, and GSCoolink GSV2002; the ESP32 processes HDMI video into colors while the CBU handles Tuya cloud and LED output.
  • It supports HDMI HDCP2.2 and 4k@60Hz HDR10+, and ships with an 84-piece 5050RGB LED strip for 2.6 m, priced at 129.99zł.
  • The Tuya Smart app exposes row-and-column sampling settings for the LED effect, but the software and instructions seem limited to a 65" TV, not smaller or larger sets.
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📢 Listen (AI):
  • #31 21780960
    sounixske
    Level 2  
    Posts: 2
    hey
    i need some help on this one
    I flashed mine with the cloucutter and al went great, but now i need to configure the p(nr) stuff and i am stuck
    i found out that PW8 reacts to PWM but thats it. it lighjts up the hole strip white. if i remove the value en restart it goes black again
    no clue what the do now

    any 1 got advice on this ????
    -is the firmaware wrong ???
    -did i kill it ???
    - someyhing helpfull ???


    INFO:
    Built on Dec 9 2025 08:14:59 version 1.18.226
    https://github.com/tuya-cloudcutter/tuya-clou...s/lsc-3017060-hdmi-light-sync-box-v1.0.7.json <-- changes noting

    i have the exact same model as the topic here
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  • #32 21796162
    artin.bruyen
    Level 17  
    Posts: 339
    Help: 13
    Rate: 129
    Does this gingerbread man work on 120Hz? To me it works max on 60Hz and I don't know if my laptop is giving it some kind of bad signal or what?
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  • #33 21796194
    Stanley_P
    Level 28  
    Posts: 1301
    Help: 61
    Rate: 287
    artin.bruyen wrote:
    Do you guys have this gingerbread machine working on 120Hz? For me it works max on 60Hz and I don't know if my laptop is giving it a bad signal or what?

    For you need to read the specs, gingers also ;-)
    Max, 60Hz.
    Box contents and technical specifications of LED HDMI light kit
  • #34 21796197
    artin.bruyen
    Level 17  
    Posts: 339
    Help: 13
    Rate: 129
    >>21796194 Thanks, I gutted that manual the other day because I've had it as another light for a long time, but now I got a 55" and I'm thinking of installing it.
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  • #35 21796222
    Stanley_P
    Level 28  
    Posts: 1301
    Help: 61
    Rate: 287
    artin.bruyen wrote:
    but now I've got a 55" and I'm thinking of installing it.

    At my place it just hangs around as a static illumination of the old t.v., sort of a'la a back light that comes on and goes off at certain times. The "ambilayt-like" effect somehow didn't convince me. By the way, Philips fell out of favour before buying a new t.v. (I mean, not necessarily Phil, and that's what happened). But that's just my subjective feelings there.
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  • #36 21815883
    adidas
    Level 11  
    Posts: 54
    Rate: 14
    Is it possible to turn it up on the device somehow in order to make it run more smoothly? In the sense of the response time of the led changes to what is displayed
  • #37 21834046
    sokolka5555
    Level 1  
    Posts: 1
    HDMI 2.0 or 2.1 or even automatic switching does not work for me, in effect I have to set the TV to HDMI 1.4 and it gives me a UHD signal but only 30Hz - I have already tested 3 different models (the one from Action and the LDD11 and another "no name") and in none of them is it possible to set HDMI to automatic signal or HDMI 2.1 - only 1.4 works. Any advice?
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Topic summary

✨ The discussion centers on a teardown and analysis of the HDMI Sync Box from Action (model 6204000100), priced at 129.99 PLN, designed to create an Ambilight-like effect by connecting an LED strip (84 pcs 5050RGB LEDs) to a TV via HDMI. The device supports HDMI HDCP 2.2, 4K@60Hz, and HDR10+, and contains three main chips: BK7231N/CBU, ESP32-D0WD-V3, and the HDMI video extraction chip GSCoolink GSV2002. Users report the device is optimized for 65" TVs, with limited software support for smaller or larger screens, leading to various user-devised mounting adaptations. The LED strip appears powered via a USB socket, likely at 5V, and may use WS2812 or similar LEDs. The device only processes external HDMI sources and does not support internal TV apps like Netflix directly, requiring the signal to pass through the box. Sync issues are common, with users troubleshooting HDMI connections, app synchronization, and effect activation. Some report sound loss when connecting devices like PS5. Network-related problems after router changes cause LED failure and app disconnection, with factory reset procedures involving multiple power cycles suggested but not always effective. HDMI splitters (active or passive) can be used to connect multiple sources, with the box extracting colors from any input signal. Over time, some devices experience progressive failures including loss of video and sound output. The device is considered a cost-effective alternative to Philips Ambilight but has limitations in compatibility and software flexibility.
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