[SCRAP - do not buy] OLED 0.91 with I2C interface - useful or scrap

got a 0.91 OLED with i2c interface from china and spend a lot of time without any
success to display some text, just a dark display , grrrrrr !?

this is it: http://www.ebay.de/itm/201537040004

Any hints to get this working ?

used code:

/* esp8266 12E 4MB
1v85.MaBe_master_dc21cae
EMBEDDED=1
USE_NET=1
USE_TELNET=1
USE_GRAPHICS=1
*/

// 0.91 OLED from China via over I2C 4pin GND,VCC(+3v3),SCL,SDA 

// setup I2C stuff
I2C1.setup({sda:D4,scl:D5});

function start(){
 // write some text
 g.drawString("Hello OLED !-!",2,2);
 // write to the screen
 g.flip(); 
}
var g = require("SSD1306").connect(I2C1,start);

no console output