bigtreetech / bigtreetech/EBB

Pi does not boot when the SB2209 is plugged in

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Description

Pi does not boot when the SB2209 is plugged in, but once I unplug the SB2209, either with the USB C or the XT30 it boots fine. I can plug the USB in right away and nothing seems to be wrong, the board and PI operate 100% normally.

I have tried Kapton tape over the 5V pin on the PI side of the USB cable, different USB cables and the same issue occurs.

This was a replacement for the previous SB2209 I had that kept getting "timer too close" errors. This replacement seems to have fixed that problem but now the PI booting issue is now.

I though wiring on the hot end side might be bad, but the board causes the issue without anything plugged in at all other than the XT30.

Compared to the random TTC errors causing the print to stop 2-3 hours in this a a more minor frustration, but still would like to get it fixed.

Pi being powered from my Spider 2.2 board and a separate 24 to 5v buck converter (both rated at 3 amps) - same issue.

Contributor guide

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Research direction

Start by reproducing the boot failure with the SB2209 connected, testing the USB-C and XT30 power configurations described in the report. Compare the setup with and without the board, including the two stated Pi power sources and the Kapton-taped USB cable. Done means identifying a reproducible cause and a verified configuration or fix that lets the Pi boot with the SB2209 attached.

Written by the indexing model from the issue text.

Assessment

Tech stack
raspberry-pi
Domain
embedded-iot
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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