LCD do display - but pins check out

[andybarrett1]

What was the board designed in...?

Can you post the project artwork / gerbers at least ?

[Tabsoft]

The E line should pulse Positive.

If you were to send an "H" $48 to an LCD with a 4bit interface, you should see something like this.

[Scampy]

Thanks for the further info guys.

@Tabsoft - it's a 4 line 20 chr back lit display. I use them in all my projects and like I mentioned, works fine on the development board do something is screwed on the board, something that is taking the lines high or low and stopping the signals getting through.

I've traced out the schematic and compared it to the board and there are quite a few mistakes, not with the LCD part as that pings out but some nets were missed in the PCB layout module when the schematic was converted, but this was with a custom part, so that might of been human error on my part. I'm going to redraw the schematic, and re-work the PCB layout and check everything three times before sending the gerbers off. Still I have some posh new green and white coasters to put my cup of tea on so I guess all was not wasted

Thanks again for every ones contributions

[Tabsoft]

Good luck there, sir.
Nothing like PCB Coasters! I have a few myself.

BTW what Schematic/PCB software are you using?

[Scampy]

I use DipTrace. Up until now it's been excellent and I've produced several working boards from it.

To be honest I think it's 50:50 human error / software error The nets show up for the custom part in the schematic, but were missing in the layout... still having spent two days now trying to sort this I think it's passed debugging and time to start from scratch

[andywpg]

Good luck there, sir.
Nothing like PCB Coasters! I have a few myself.

I get some of that green felt from the fabric store and glue it on the back so they don't scratch the coffee table......

[Scampy]

Well after a few hours work I've redrawn the schematic and this time names each net, and give the pins on the connectors names so that everything can be traced and identified when it comes to converting to PCB layout.

It's nearly 2.30 am !! (struth don't time fly when having fun !) - let me know what you guys think

[Tabsoft]

Can't really read the schematic because the picture is so blurry.