just bought an LCD screen form this forum and i can't get it to work, have been using LCD smartie software. the LCD is parrallel and its a 2x16, but no idea what model it is. it also has a variable resistor for the backlight. when i turned it on the backlight was very dim and nothing was on the screen, i think it may be the wiring. i noticed on the side of the LCD there was a + and-, surely it would need this for it to functio properly, as the 5v from the molex was going to the main row of pins. can somebody please help me or give be a wiring diagram or any assistance what so ever. Thanks
Have you dloaded and installed port95 ? , because without it you will not get anything on your lcd, and the wiring is often as you describe . http://liquid-mp3.schijf.org/files/port95nt.exe If you still get nothing then its probably a hardware/wiring issue.
yea, my LCD smartie software said that so i got it and installed it, can you direct me to a wiring diagram? i've looked around, but havn't found any of use???
Have a read through the lcd faq , plenty of links in there , but you need the datasheet for your lcd so you can check the wiring against a (HD44780 or HD44100) wiring scheme. Google is your friend http://www.icehw.net/article.php?id=104 http://forums.bit-tech.net/showthread.php?t=44604
right, i wired it up according to the 16 pinn guide, but mine only has 14 pins then a seperate 2 at the side for the backlight, fired it up, p95nt driver installed, but no backlight this time, not even dimm a dimm one
Show us your wiring diagram, maybe someone can help. Also there is a variable resistor used for contrast control, have you tried turning it, that maybe the reason why there's no display. One final thought, what is your parallel port setting in BIOS. ARM
http://www.icehw.net/article.php?id=104 thats the wireing diagram i've used, i'l put the variable resistor in the display circuit and check parralel settings in BIOS
Hi 2800, I use the wiring diagram in the LCD Smartie website: http://lcdsmartie.sourceforge.net/circuits.htm I haven't compared your circuit with the one above in detail, but I noticed that your circuit doesn't have pins 18 to 25 (at the parallel port) grounded. I do not know if this is an issue. Also LCD Smartie faq recommends that the BIOS setting is set to EPP. ARM
right, i did what it said and grounded them, powered the LCD up but no backlight still, but you can see the text very faint on the screen which is a start, on the diagram it mentions resistors of some kind, are these really necessary.
The two resistors of some kind that you mentioned in the diagram are variable resistors (ie resistors that can be adjusted). The 10K one controls the contrast, which is why I suggested adjusting it. There are some circuits that leaves this out, but I just followed the circuit and it works (I believe that some types of LCDs need the var. resistor for contrast control). You may want to check out the FAQ section in LCD Smartie's website; ie check your wirings again. ARM
I've wired one up according to this scheme ( http://www.icehw.net/article.php?id=104 ) with great success. Instead of using the pot, try connecting it to ground like they mentioned. If you do try using the pot, connect one side to VDD, one side to ground(VSS) and the center (wiper) pin should go to VO.
thanks zero, the wiring was a bit of a mess anyway so i've ripped it all to bits and i'm going to start a fresh, i'll get back to you later on today. fingers crossed
i was typing a message saying how it wasn't working but i just realised that i'm powering it from an external molex i made for the fans on my radiator WHICH DONT HAVE A 5V RAIL ARGGHHHH i'm such a ********ing ********, i'll try it on a propper molex and get back to you
well it passsed a bit of time didn't it, i'm planning on getting a bigger LCD or even a full colour one, so this probably wont be the last time i need your help thanks again
