roswell — I2C bus
On iPhone 11 Pro Max, according to the schematic, the i2c3 bus serves the front camera, telephoto camera and touch connector; the “Roswell” device is addressed through the touch connector (J8100). The iFixit respondent concludes the display / touch is faulty.
iPhone
Display — touch panel (“Roswell” controller on the touch connector)
Low confidenceVerified sourceI2C bus
First check
Test with a known-good display; check the touch connector.