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UPD. When load recovery and connect trackpad on working machine all works pretty good any time, but when I do anything (click on window or etc) it freezes. Maybe whose know why on smbus lines voltage jump from 1.8 to 3.3v?

Yes, I load diagnostics but it freezes when tpad is connected and pass diagnostics with tpad thermal sense error when tpad disconnected.

UPD. I take 820-4924 schematic, find and check smc pull-ups it's appears OK but voltage on this lines (SDA SCL) is from 1.8 to 3.3v i don't know maybe it's normal in oscilloscope i have some data activity After replacement 2 IO Expanders, no result I think maybe problem in thermal sensing or...

I changed the connector but it did not help

This board won't load OS when trackpad connected(freezes in apple logo) and function normal without trackpad When connected in EFI tpad and keyboard functional normal but no boot OS from SSD or external devices, if i press D to built-in diagnostic and it freezes after 1 minute of test I will...