i2c3 — I2C bus
According to REWA, on 7/8/X i2c3 groups the charging port, the connector and the display, and on XR/XS the display power driver and the touch. The iFixit cases (roswell, display-pmu, display-eeprom) also point to the display.
iPhone
Display / touch / display connector (depending on model), sometimes charging port
Low confidenceVerified sourceI2C bus
First check
Read the device after “for device”; test with a known-good display.