Hi,

I would suggest writing to the LCD only when you need to update the display info.
Constantly writing to it in a loop without any kind of delay may be causing the problem.

Code:
pause 500
                        
lcdout $FE,$28
lcdout $FE,$17
lcdout $FE,$06
lcdout $FE,$08
lcdout $FE,$01
lcdout $FE,$02
lcdout $FE,$0C
lcdout $FE,$80,"BU BiR DENEMEDiR"
LCDOUT $FE,$C0,"  iKiNCi SATIR  "


Main:
 Do stuff
 IF something_new THEN Update_LCD

GOTO Main


Update_LCD:

 lcdout $FE,$80,"BU BiR DENEMEDiR"
 LCDOUT $FE,$C0,"  New data  "

GOTO Main