# LCD 16x2 can't display [closed]

I have a small project with AT89S52 and LCD 16x2. I build circuit and simulation in Proteus. It works normally. But when I build PCB, LCD can't display the value. I just adjusted rheostat to change LCD's contrast and it worked. Can you told me the mistake that I have?

## closed as unclear what you're asking by pipe, Voltage Spike, Elliot Alderson, Edgar Brown, Dwayne ReidJan 11 at 19:17

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• Read the manual about LCD bias contrast voltage – Sunnyskyguy EE75 Jan 8 at 4:56
• It worked fine, or you're getting those blocks in the photo? – Spehro Pefhany Jan 8 at 4:58
• Can you told me the mistake what i have? .... you provided no schematic and no program listing .... the answer is no, we cannot tell you what mistake you made .... we can only guess about a mistake that you might have made – jsotola Jan 8 at 16:38