K8095 with LCD

I have a problem with a K8095. The LCD module shows only filled boxes where the signs should be.
I have tested the LCD on a VM8095 and it works ok, but the LCD from the VM8095 doesn´t
work on the K8095.
All soldering points are carefully examined with a magnifying glass.
What could be the problem?

Very strange problem.
For some more info please see:
viewtopic.php?f=2&t=7475
viewtopic.php?f=2&t=7507