Problem with LCD 20X4

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hi

i have problem lcd 20x4 external ic2 connected lcd 20x4 in protoboard

firts try using 16x2 lcd (with external ic2) print messages using const char *string_table[] {}
the problem messages not display, first letter display, in case can solve problem new liquid crystal library.

but need diferent display of messages using 20x4 new liquid crystal , library (incluying default library in ide of arduino) can't work , display nothing.

any help?
 

there few precise information "on point":

1. sure connected right?
2. have delete other lcd libraries first , install newliquid crystal lib make sure library used (in doubt: switch on verbose output , see compiler messages, e.g. lib loaded)
3. did check i2c (not ic2!) address address scanner?
4. let's have @ code (pls in code tags </>) see if used "right constructor right"
5. if possible, let know brand/manufacturer of lcd screen , i2c module

you can lot of information here, if display blue 1 (maybe valid other colour types).


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