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Hello.
I want to report for problem with PIC16F877A.
I maked simple programm with PIC16F876A. There is some leds, LCD and buttons. Everything work. I change MC with another, for example PIC16F877A, because have many ports. And surprise: Program work, but LCD not work. I not understand what is reason for this, provided that all conditions are the same.

Hello,

It looks like your program for the 16F877A should be ok. Have you checked that your port B connections to the LCD are correct on the hardware? A quick multimeter connectivity test should confirm if the pins are all connected correctly with no shorts or breaks. Also worth doing a 1 second flasher test if your in doubt the micro is running correctly.

Thank you, Benj.
There is break in wire.
And with the fact that I made other circuits with these cables and they worked and even though I checked everything. But as it says: one more check is never superfluous.