Matrix Orbital Corp

Hi to everybody.

I just bought a LK204-25PC two months ago. It's works fine until last three weeks.

I put on the CPU and the LCD go on but don't show the logo. Then, i work on the pc and two hours pass the LCD show the logo . If i restarted the pc the LCD works fine, but if i put off the pc and then put on the LCD put on the light but don't show the logo again.

Can anybody help me?

excuse for my english, i'm spanish.

if you just plug the LCD in with no serial cable, will the contrast fade over time?

Some times if i plug the power conector to the lcd without serial cable, the leds are on and the another times are off.

Always, when i power on the lcd two block rows are showed and go down in intensity until the lcd don't iluminated.

please help me.

sorry for my english.

We will need to evaluate the unit more closely. Can you contact me at myero@matrixorbital.com and we can discuss a few options.

Miles Yeroschak
Technical Support
RMA Department
myero@matrixorbital.com

I put a switch in the +5V power cord. If i push the buttom the power doesn't go, buy if i don't push it goes.

Well when i power on my computer the lcd don't show the logo. If i push the switch some times (three, four or five normally) the lcd displays the logo and my LCDC program works very well.

I'm happy for my display works but i don't like the solution.

Can you explain me the problem? Can you send me a solution more proffesional?

Thanks and excuse me for my english.

It could be a variety of issues:

a) Is the ground properly grounded to your power supply?
b) Are you getting 5 volts at the display?
c) How big are your wires when you built the power cable?
d) What actually might be running your display is leakage current coming down one of the data lines.