Cant get LCD working with I2Cbus on mega

good morning to all here,

Solved !

What i forgot - but rememberd this night
is the issue, that wiring between ardiuno ... and LCD via I2C is critical
in type and length !

replacing the multible plugged wires SDA / SCL with directly wires
it taked success and my beloved Ardi shows what he does :grinning: