MX6 series doing funny things on GPO#3

Dgephri · Post by **Dgephri** » Sat Jun 16, 2007 1:38 pm

in my LCDC, I had been using PWM fades to make my LEDs throb.

25ms @ 5%
25ms @10% and so on.

But lately, my GPO #3 won't even come on at Startup, or show any indication in the Virtual display that it's doing anything.

I put my MM on it, and with nothing attached, the wires show 11.27V.

When I plug my LEDs into it and check the exposed fan plug tips, I get 4.91V.

Is it somehow current limiting down to 5V? These are the same LEDs I ran for several LAN competitions, and had flashing, etc.

I tried setting the GPO Power On in BootEdit, but that didn't change anything that I can tell.

Raquel · Post by **Raquel** » Mon Jun 18, 2007 10:27 am

Hello Dgephri,

I have a couple of questions:
1) What is the voltage/current rating of the LEDs you are using?
2) Are you using current limiting resistance on the LEDs?

Thanks,

Dgephri · Post by **Dgephri** » Mon Jun 18, 2007 11:19 am

they are 5mm rated at 20mA each...6 total, 3 blue, 3 white in Series that worked before.

Each has 2.1-2.3V drop, so IIRC I just put 82 Ohm or something in line.

Both LED circuits (6 LEDs each) work on GPO2 by themselves (GPO1 is PWM for fans) but neither works on GPO3.

Raquel · Post by **Raquel** » Mon Jun 18, 2007 3:19 pm

Hello,

It sounds like your display may have a blown mosfet. Can you please contact support@matrixorbital.ca for an RMA contact?

Thanks,

Dgephri · Post by **Dgephri** » Mon Jun 18, 2007 3:56 pm

OK, thx will do.

My Typhoon is coming soon anyway for my next case.