AT89C4051 as RTC need help

your PCB is really good happy to see it..

its really strange to see that LCD not working.. you said that you have used LCD in two project and it did not show anything. so i must say that you should test your LCD first. make a sample program and test LCD.

One more thing.. make sure that you are connect LCD in right way... i mean to say.. check pins of LCD. Pin3 of LCD is connected to potentiometer. so you should know what is the correct order of pins for connection.

i replaced the potentiometer in pin3 of LCD with 10 KOhm resistance between pin3 and the GND
is that make the LCD can't display any thing??

In your PCB,the pot is wired incorrectly I'm afraid.Pin 3 of the lcd should be connected to the centre of the pot,whereas in your pcb the pot's centre tap is connected to gnd.
Anyway you aren't using the pot,so I'd suggest temporarily connect pin3 to gnd and see if it works.
If it still doesn't work,write a small prog to blink some led or sth and see if your micro and crystal etc are ok.Finally check the lcd in some other project or the pc parallel port with some lcd software.

Sashi is right.
if you do not want to use a POT then connect 1K resistor between Pin3 and GND. if possible check your LCD separately first.

my circuit is not displaying properly

my circuit is not displaying properly

prince

Please post in a different thread..

i used 2 LCDs and and both do same thing they just work without display any thing
and replaced the pot with 1kOhm between p3 + GND and also same thing no display

it is better to check your LCDs separately. or there must be something wrong with your controller then. write a sample program to check if your controller is working or not.. and crystal is working on not.. check crystal on CRO.

My circuit isn't working as you, thunder! AlthoughtI don't find any wrong on board!

i used AT89c4051 but but lcd not works properly.