i tried with 7C, no work
i made other test also, i removed the bitshift right operator from all libraries, and directly specified 0x3E (this is my real address) but no work
i will continue.
p.s. often, like in my case, the lcd do not have datasheet or it is not simple found it.
so the only way for found the address is scanning the i2c bus.
Whit your bitshif tecnique will be difficult use the library.
i think it is better do not use it, and found the real i2c address for every lcd.