Alphanumeric LCD interfacing problem with PIC

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microlab

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Dear friends

i am facing problem with 4x20 alphanumeric LCD
i had interfaced the JHD204A LCD to the PIC 16F887 in 4 bit mode and is working fine.when i brought another JHD204A, it's not working, i tried with many LCD's and the same problem repeats.the only difference i found is in the original LCD(which is working fine) shows JHD629-204A M10 and all the newly bought are showing JHD629-204A M12. what could be the problem?

ml
 

Timing is one of the major aspect when dealing with LCDs.

try experimenting with the delay part of the working code.
 
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    tinto

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Once i faced this problem.

Different revision of lcd's have different timings.

Try increasing the delay's
 

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