PR11

[ken_257]

HI all ,

i had copy the board and do it new one, after all done, load the program to IC done. when i turn on the circuit one red and green LED is turn and one fan turn on, but the display LCD is nothing just show the black box at uper row only .... any people can help me ...

i had check all connection with the original board, all is correct ....

thank

[mec]

So you got a original PR11 board which is working? If yes, you can just verify the LCD first by changing the LCD to the working board. If the LCD is working, then should be connection problem.
Last time i have to get a new LCD after damaging my previous one.

[ken_257]

the original board is blank, i use all component install at my board already , so that i need to buy 1 set component and install again ...

[kl84]

Did u tuned the variable resistor?