Hi,

My lcd AG-16080B when connected and fired up , my voltage regulator
becomes too hot! I still can't get it to work right. Apart from that
the contrast is working, the backlight and pin 19 DispOff/On also works.

Do you think I might have burned it ?

datasheet: http://home.comet.bg/datasheets/LCD Grafical/AG-16080BYILY-30H-A(R).pdf

graphic controller :
http://www.alldatasheet.com/view.jsp?Searchword=LC7981

 

I would try canging the voltage regulator. Do you have another you can try? Also Are you sure the voltage regulator is wired and heatsunk properly?

Do you have a schematic for this circuit?

 

Hi, thanks for the idea.

I am using a dev-board with pic18f4550 and a voltage regulator on it.
Here is the schematic: http://www.olimex.com/dev/pdf/PIC/PIC-USB-4550.pdf

According to specs the lcd should not draw more than 5mA, but instead it
draws 12mA through its Vdd and Vss pins. The other pins hardly consume
any current.

I connected a resistor 10k in series to Vss and a defect that was showing before
disappeared but the lcd still did not work. The defect is that sometimes
vertical lines are shown on power on reset.

Also the writing and reading into the ram of the lcd sometimes works
sometimes it does not.

Could I have burned the lcd when I was measuring with a multimeter
the resistance between the lcd pins ?