16 X 2 display gone fritzy

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i prototyping , life good.  amerlight tm lcd module 2x16 showing supposed show.  of sudden right half of display started showing garbage.  whole thing went downhill.  backlight still works, areas letters still light up, see blocks.  checked wiring, looks good.  tried resetting nano , re-uploading sketch.  indications nano fine , things running, still no joy on display.   

what's best way test display standalone see if problem there or if it's nano's output?  see sort of thing before?

quote
the amerlight tm lcd module 2x16 showing supposed show.  of sudden right half of display started showing garbage.

so 2 possibilities:-
1) wired wrong , fried part
2) wiring has come disconnected
either way need post schematic , photo of have got.


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