My CLCD can't display the correct' char @.@

3ASV467 · Post by **3ASV467** » July 11th, 2008, 10:15 am

I'm using a PCI parallel card
Is it an hardware problem

Post by **mattcro** » July 11th, 2008, 10:54 am

Double check your wiring. It looks like you have pin D0 on the LCD accidentally connected to +5V (maybe a stray blob/spike of solder) or possibly disconnected. It should connect to pin 2 of the LPT port.

Post by **limbo** » July 11th, 2008, 3:49 pm

looks that some characters are changed with the next ones on the character table.... R>S T>U.

Please checkthe char table and confim if this happens in all rows..

3ASV467 · Post by **3ASV467** » July 11th, 2008, 4:38 pm

#2
I would check it tomorrow
thank you first
#3
You mean use the char in others row(@->A,P->Q,...) and see if this happens in all rows..

and some time the char shifting isn't regular

likes

Same setting
but different result after the screen changed for a round

Post by **caesar** » July 11th, 2008, 8:34 pm

Try changing in display settings the startup parameter from LPT1 to LPT1,5 and see if it helps.

3ASV467 · Post by **3ASV467** » July 12th, 2008, 2:43 pm

My wiring
LCD
pin4-->parallel pin16
pin6-14-->parallel pin 1-9
The solder point are fine

As for changing the parameter
I am using $FFE8 instead of LPTx
There is a range from $FFE0 to $FFEF
But the LCD can only display something when using $FFE8

Post by **caesar** » July 12th, 2008, 8:11 pm

then try $FFE8,5.

3ASV467 · Post by **3ASV467** » July 13th, 2008, 8:26 am

$FFE8,5 show the same result

Here is the I/O range from device manager
FFE8-FFEF
FFE0-FFE7
FFA8-FFAF
FFA0-FFA7
FF98-FF9F
FFF0-FFFF
IRQ is 17

There is some problem with the card
If i plug the card before entering OS
the lan drive would not been load
I had to plug the card after the entering OS
Do it related to the problem?

As for the char shifting
0123456789 would become
1133557799

@ABCDEFGJHIJKLMNO would become
AACCEEGGKIIKKMMOO

PQRSTUVWXYZ[\]^_would become
QQSSUUWWYY[[]]__

looks like the odd number row cannot be displaced and replaced by
the row below it

Post by **mattcro** » July 13th, 2008, 6:04 pm

It looks like the D0 signal on the LCD is stuck high, either because the LPT port is faulty/damaged, or the LCD is faulty or there's a problem with the wiring. You said you're sure the wiring is OK. Check the D0 signal with a multimeter with LCD Smartie running. If you never see 0 volts (or close to 0), only 5V, then there's definitely a problem somewhere. Try measuring with the LCD and cable disconnected. If you now see 5V sometimes and 0V sometimes, then there's a problem with the wiring or LCD.

3ASV467 · Post by **3ASV467** » July 15th, 2008, 11:22 am

Sorry but is D0 DB0?
If so,
It's voltage variate from 0V to 5V
And just pin 1 and pin9 of DB25 connector always 0
*With/Without the LCD is the same
Thankyou for answering first

Post by **mattcro** » July 15th, 2008, 8:30 pm

D0 is the same as DB0. Did you measure at the LCD board or on the LPT connector? If the signals are OK at the LCD board, you probably have a damaged LCD

3ASV467 · Post by **3ASV467** » July 16th, 2008, 3:28 am

measured from the LPT port and the LCD
the reading are the same

Post by **caesar** » July 16th, 2008, 7:40 am

That means that the problem is with the LCD. It is possible that the DB0 trace is damaged on the LCD.

If you cannot exchange the LCD and don't want to loose the money spent then you can always try this: http://forums.lcdsmartie.org/viewtopic.php?t=1540
That way you don't use the DB0 pin.