I have a graphical LCD module and as the subjects says It is VK5081 with resolution 80x160. So I'm driving It with Mega128. I tried to use It in a character mode. So i initialized It, as the datasheet says, and I've choosed a character pitch 8x8, so 20 columns and 10 lines. And when I try to write some data to It, I can, but It seems that the internal character generator is not working properly. For example if I write symbol '0' or anything else, the character is drawn with missing or added dots in the pattern. I have tried to write only one type of symbol in all the 200 positions, and everywhere the symbol is not displayed correctly. And also from position to position It's pattern is not the same. The symbol looks like the desired but with missing or added points. The graphical controller is HD81630 from HITACHI.
I've also disabled the cursor and I It's position is at the bottom of the symbol, i.e. position=7.
So, fellows, does anybody have ever seen something like that. I really need help because that LCD was the only one from the store, because is OBSOLETED may be and if something is wrong inside in It, I'll get mad, because my PCB is already manufactured for It's mechanical and electrical connections.
Thanks to all, that will reply, in advance!