Having problem in supplying correct current to LCD

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caramelz

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I'm using TC1602A LCD and PIC18F4520 microchip. the LCD display square black box when I tried to display something. When i connect 5V from the fixed 5v power supply, it can display what I want. Can anyone tell me what wrong with it ? I tried to use potential meter to reduce the current but it burned.
 

caramelz said:
I tried to use potentiometer to reduce the current but it burned.
Click to expand...


Somethings sounds miswired or ESD damaged. The Chip takes 10mA and the backlight 250mA and the recommended pot 10K I think is for contrast bias.

So I am not sure what happened.
 

I connect LCD pin1,2,3 to pot 1,3,2 . Is it correct? is it because the LED background took too much current?

- - - Updated - - -

i'm using a 9V 0.75A Adapter output adapter.
 

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