FAQ
TL;DR: The Action HDMI Sync Box 6204000100 supports 4 K @ 60 Hz HDR10+ and typically draws 8–17 W while syncing [Elektroda, Stanley_P, post #21331701] "It keeps up with image changes quite well" [Elektroda, Stanley_P, post #21331701]
Why it matters: This FAQ helps DIY tinkerers and new owners troubleshoot power, video, LED and Tuya-app issues without voiding the warranty.
Quick Facts
• Price in EU stores: 129.99 PLN ≈ 30 € [Elektroda, Dark Man, post #21328672]
• Core chips: ESP32-D0WD-V3 + BK7231N/CBU + GSV2002 HDMI-RX [Elektroda, Dark Man, post #21328672]
• LED strip: 84 × 5050 RGB, 2.6 m, 3-edge layout [Elektroda, Dark Man, post #21328672]
• Power use: 4.5 W standby; 8–17 W normal; 20 W max-white [Elektroda, Stanley_P, post #21331701]
• Video spec: HDMI 2.0, HDCP 2.2, 4 K 60 Hz HDR10+ pass-through [Elektroda, Dark Man, post #21328672]
How do I hard-reset the HDMI Sync Box when the LEDs won’t pair?
- Unplug power for 10 s.
- Power-cycle three times: on→off→on→off→on, waiting 1 s each.
- After the third ON, wait; the strip should blink red and the box enters pairing [Elektroda, W.W, post #21422828]
Why do the LEDs stay dark although video passes through?
The BK7231N loses Tuya Wi-Fi credentials after router changes or brown-outs. Without a cloud link, the ESP32 never receives colour frames, so the strip remains off [Elektroda, AD93, post #21422754] Perform the hard-reset and re-add the device in Tuya.
Does the box work with Netflix, YouTube or DVB-T apps built into my TV?
No. The box only analyses HDMI input it physically receives. Internal TV apps never output HDMI video, so no data reaches the GSV2002 chip [Elektroda, Stanley_P, post #21338477] Use an external streamer (Fire TV, Chromecast, STB) and route it through the Sync Box.
Can I connect several sources—console, decoder, PC—through an HDMI splitter?
Yes. Users report full colour sync using an active 3-input splitter; at least two inputs must be energised for some models [Elektroda, ktwarszawa62, post #21360558] Any powered or passive switch that maintains HDCP 2.2 handshakes should work [Elektroda, Dark Man, post #21339633]
Will the Sync Box handle HDCP protection or break it?
The GSV2002 receiver negotiates HDCP 2.2 and passes encrypted video untouched; it does not strip content protection [Elektroda, Dark Man, post #21328882] "Protections stay because the box only mirrors colours, not content" [Elektroda, krzbor, post #21329013]
What voltage and protocol feed the included LED strip?
PCB traces show 5 V supply over a USB-C-style connector. Data looks like single-wire WS2812 timing, matching the 84-pixel strip [Elektroda, prosiak_wej, post #21329700] Measure before swapping strips.
How can I adapt the 2.6 m strip to a smaller 48″ TV?
Options: 1. Snake the strip in gentle waves. 2. Start and finish short of corners. 3. Replace with higher-density 144 LED m strip and edit pixel count by intercepting SPI on BK7231N firmware [Elektroda, Dark Man, post #21330709]
Why is there no sound when I connect a PlayStation 5?
Check PS5 audio: set HDMI Output → Linear PCM. The box passes LPCM and Dolby Digital but not DTS-HD; TVs may mute unsupported codecs [Typical spec]. Update PS5 and TV firmware, then retest through ARC.
The box overheats—should I worry?
Measured surface temperature stays below 60 °C at 1080p and peaks higher under 4 K. Average draw 17 W suggests normal thermal load [Elektroda, Stanley_P, post #21331701] Add ventilation slots or a 5 V fan if the case exceeds 70 °C to avoid HDMI dropouts.
Can I dump or modify the firmware?
Yes. Gold-pin headers expose RX/TX/GND/3V3 for both MCUs. ESP32 GPIO0 and BK7231 CEN lines have on-board buttons for flash mode [Elektroda, Dark Man, post #21328672] Use esptool.py or BKWriter to read images and patch Tuya routines.
Why does standby still consume 4.5 W with LEDs off?
The BK7231N keeps Wi-Fi and BLE radios active and powers the strip’s onboard ICs even when LEDs are dark, drawing ~2 W. The remaining 2–3 W feed the HDMI receiver and ESP32 idle loops [Elektroda, Stanley_P, post #21331701]
What causes brief 2–3 s video blackouts?
HDMI re-handshakes occur when source resolution, HDR metadata or refresh rate changes. Cheap cables or long runs amplify the issue. Users noted resets at power glitches that later led to LED loss [Elektroda, W.W, post #21464894] Replace cable or force fixed resolution.
Is there a fix for a complete HDMI video loss but flickering audio?
Corrupted GSV2002 firmware or 5 V rail sag can crash the receiver. First, swap the PSU; ensure it supplies 5 V 2 A stable. If video still fails, reflash GSV2002 microcode via ESP32 SPI lines using vendor tool [Edge failure, kubafarbisz, #21565671].
