Ingrem Gaming Chair Board Wiring / Photos Needed

[Matrim72]

Hello everyone,

I’m working on diagnosing and rewiring the control system for an Ingrem Veyron J20 gaming chair. The chair uses a servo module with an RJ45 connection to the handheld remote, and I’ve been tracing signals back to the main board (marked ST‑H801S‑V1.1 and ST‑H8‑CORE‑V2.1).

Here’s what I’ve established so far:

• RJ45 pinout from the remote:

  • Pin 1 → Green (likely RX)

  • Pin 2 → Black (Ground)

  • Pin 3 → Yellow (TX??

  • Pin 4 → White (logic/handshake line, not VCC)

• The board itself has a separate AC power feed.

• With RJ45 disconnected, the board powers up fine (red LED lights). When RJ45 is wired incorrectly, the board fails to boot.

• I believe the connections come from UART1 and COM20, but I don’t know how they should map to the RJ45 connector

:question_mark:What I Need

If anyone here owns an Ingrem Veyron J20 chair, could you please:

• Photograph the main board (ST‑H801S / ST‑H8‑CORE) with the connectors attached.

• Show the RJ45 wiring harness and how the colored wires (green, black, yellow, white, red) are mapped.

• Confirm whether the white line is actually used for handshake or left floating.

Why This Matters

I’m trying to restore full functionality (servo + remote control). Having a clear photo of the board with connections would save a lot of guesswork and confirm the correct pinout.

Any help, teardown shots, or wiring notes from fellow Ingrem chair owners would be hugely appreciated.

Thanks in advance

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[mƎALLEm]

Hello @Matrim72 and welcome to the community.

Sorry I didn't find any information in your post telling you are using ST products.

Could you please clarify what ST product(s) are used in that project? 

This community is used exclusively for ST products. If your question has nothing to do with them, I don't see how this community can help you.

[Peter BENSCH · Accepted solution]

The printing on the SBC reads ST-H8-CORE-V2.x, and @Matrim72 probably assumes that it is from STMicroelectronics - however, it is an SBC from Smatek. I completely agree that no one here will be able to help you.

Regards
/Peter

[Andrew Neil]

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@Peter BENSCH wrote:

The printing on the SBC reads ST-H8-CORE-V2.x,

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and that's just the core processor module; the mainboard is ST-H8-01S-V1.1

I found a V1.0 here: https://blog.csdn.net/smatek/article/details/69850686 

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@Matrim72 wrote:

Any help, teardown shots, or wiring notes from fellow Ingrem chair owners would be hugely appreciated.

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You'd really need to find a dedicated forum for that !

[Matrim72]

Thank you for the guidance! I relied on AI to direct me to help, so this might better place me to find it.