GLCD via 12c

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i have been trying nick gammon's glcd via 12c project going without success.

http://www.mushclient.com/forum/?id=10940

i know there have been other threads dealing issue cannot find them
this display using

http://www.ebay.com.au/itm/160612198970?sspagename=strk:mewnx:it&_trksid=p3984.m1439.l2649

and know because have used glcd 3 library no problems bill perry. have rechecked wiring , seems backlight working , can adjust contrast pot , see individual pixels. code upload there nothing showing on display. used 12c scanner at   

http://playground.arduino.cc/main/i2cscanner   and got

"i2c scanner
scanning...
no i2c devices found"

i using 12c connection method mcp23017 chip , glcd display (type b) has same connections 1 used in nick's project. can offer suggestions might doing wrong. have attached photo of setup don't know if help

thanks pedro.

quote
no i2c devices found"

i don't see pull-up resistors on 2 i2c lines (sda , scl).  if using internal ones may not sufficient.

don


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