display-eeprom — I2C bus
i2c3 communication with the display EEPROM interrupted. An iFixit respondent points to the display first (damaged replacement part), otherwise the touch controller or the board.
iPhone
Display (often non-genuine) — or i2c3 line on the board side
Low confidenceVerified sourceI2C bus
First check
Refit the original display or a known-good display; otherwise measure the i2c3 lines at the display connector.