Polar 78ES - Replaced display - Only backlight working - no imageset

Good Day,
Please can you help. I replaced the Toshiba TLX-1741-C3m display with a new Hitachi TLX-1741-C3m. Based on the specs, the board I purchased is a replacement for the Toshiba. I connected it yesterday. The backlight comes on, but no imageset on the display, everything else works on the guillotine. It did give a few beeps on startup. Can anyone suggest any fixes. The IDC connectors on the board were a bit of a different orientation so I had to make a new ribbon cable to connect from display to the driver board but I checked this wiring and all seems to be as the old board.
Thanks

 

Possible the Display is NOT compatible.

2) However Backlight is o.k

3) Review +5Vdc +9Vdc in the board of POLAR, if there are in Tolerance 0.7% up or down, otherwise replace or repair.

4) IF after everything is o.k, Display NOT compatible.

 

Good Day Chock.

Thanks so much for the response. I will check the tolerance levels as advised.
Hoping I can get something.
Will let you know what the outcome has been.
Thanks so much

 

ok sir

 

Good Day, just to give you feedback. The replacement display is working. The new display came with a surface mount potentiometer which needed to be tuned to get the correct contrast. This was done and voila!

Thanks for the assistance.