Lcd Not Working..

[koossa]

Good day

I'm using a 16F877 with 16x2 Character LCD on a breadboard.

I have search everywhere for a LCD that uses low current and specific dimensions.
I have found one, but could not get it to work.

The old LCD is working perfectly. I have just replaced my old LCD with the new one and connected Vo to ground just to see if it is giving me the black boxes, but no luck.



Thank you
Koos du Preez

[DynamoBen]

Black boxes are good that means the new lcd works.

You will want to make sure the lcds are pin compatible. I have had cases where one model lcd had one pinout and the other had something completely different. Compare the datasheets.

Also, try increasing the LCD_COMMANDUS and LCD_DATAUS the new lcd may be a bit slower to respond.

[koossa]

Thank you for the reply, I will try the suggestions.
I Know black boxes are good, but I do not get them?

[koossa]

This one is supposed to work?
Controller/Driver: KS0070B

[DynamoBen]

If the LCD is wired improperly it can permantly damage the lcd. (hence no boxes)

[koossa]

I have done the following

DEFINE LCD_COMMANDUS 4000
define LCD_DATAUS 555

As well as replaced the LCD with a new one, but still nothing?