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I have this macbook that I am working on. The most suspicious thing that I found is voltage drop when trackpad is not connected vs when it's connected.
Voltage when disconnected:
TPAD_SPI_CS_L 3.3V
TPAD_SPI_INT_L 3.3V
TPAD_SPI_CS_CONN_L 3.3V
TPAD_SPI_IF_EN 3.3V
But when I tried to connect...