I do have a simular issue like in topic 239946.0 that I found here. Ordered a cheap I2C OLED from ebay that says ADD ADRESS 0x78 on the backside and was named to be a 128*64 SH1106 device.
But with trying all things I found so far, I only made it flicker... * I started with the Adafruit libraries and selected 0x3C ad device adress * then tried the u8glib * added pull up resistors * tried even if the naming on ebay was wrong and its a SD1306 * run the i2c scanner that found no device
As it flickers, it should not be really broken, IMHO. Is there any other tip or thread that might help? :(