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

Dark Man 8019 36

TL;DR LABEL_AI_GENERATED

  • Action model 6204000100 HDMI Sync Box teardown exposes the hardware behind its Ambilight-style 65-inch TV LED backlight system.
  • The PCB combines an ESP32-D0WD-V3 for HDMI image-to-colour processing, a BK7231N/CBU Tuya module for connectivity and LED control, and a GSCoolink GSV2002 HDMI extractor.
  • The box supports HDCP 2.2 and 4K at 60 Hz with HDR10+, driving an 84-LED 5050 RGB strip measuring 2.6 m.
  • Exposed RX, TX, GND and 3.3 V test headers plus buttons tied to ESP32 GPIO0 and CBU CEN provide convenient flash-mode access; the CBU firmware was successfully dumped.
  • The supplied 2.6 m strip and software target only a 65-inch TV, with no documented support for smaller or larger screens.
AI summary based on the discussion. May contain errors.
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  • Need help configuring PWM pin after CloudCutter flash

    #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: 130
    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: 1327
    Help: 62
    Rate: 294
    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
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  • #34 21796197
    artin.bruyen
    Level 17  
    Posts: 339
    Help: 13
    Rate: 130
    >>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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  • Ambilight effect deemed unconvincing on 55-inch TV

    #35 21796222
    Stanley_P
    Level 28  
    Posts: 1327
    Help: 62
    Rate: 294
    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.
  • #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

LABEL_AI_GENERATED
Discussion centers on a teardown and practical use of an Action HDMI sync box for Ambilight-like LED backlighting. The device contains BK7231N/CBU, ESP32-D0WD-V3, and GSCoolink GSV2002 HDMI extraction hardware, supports HDCP 2.2 and 4K@60 Hz HDR10+, and is intended for a 65" TV with a 3-sided 84-LED 5050 RGB strip. Users discuss HDMI signal routing, splitter compatibility, lack of support for internal TV apps such as Netflix, and the need for an external HDMI source. Several posts cover setup issues, synchronization mode activation in the app, LED strip voltage and wiring, and limitations when using smaller TVs. Later reports mention failures after power loss or Wi‑Fi router changes, problems re-adding the device to the app, intermittent resets, missing audio with PS5, HDMI compatibility issues, and reduced performance at 120 Hz or with HDMI 2.1/automatic switching.
AI summary based on the discussion. May contain errors.
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