Build Your Own Arcade Controls Forum

Main => Main Forum => Topic started by: obizues on April 18, 2022, 08:58:39 pm

Title: What would cause the entire left side of my Control Panel’s LED’s to not work?
Post by: obizues on April 18, 2022, 08:58:39 pm
I’m using an Ultimarc Ultimate I/O and as you can see one side of my LED’s are not working.

What would cause this.

(https://i.imgur.com/2I2y7Ni.jpg)
(https://i.imgur.com/3zMbIlS.jpg)
Title: Re: What would cause the entire left side of my Control Panel’s LED’s to not work?
Post by: bobbyb13 on April 19, 2022, 12:33:18 am
Loose ground is first thing to check.
If it is one continuous loop then trace until you find a break.
Title: Re: What would cause the entire left side of my Control Panel’s LED’s to not work?
Post by: PL1 on April 19, 2022, 06:29:27 am
Quote from: obizues on April 18, 2022, 08:58:39 pm
What would cause this.
Using the same order of wires for the left side LED pins (pins 1-48) and right side LED pins (pins 49-96) will cause that.

If you look at the lower left and right of the Ult. I/O PCB, you'll see that the left LED pin columns are labeled "+RGB" and the right LED pin columns are labeled "BGR+".
- Blue pins are on the inside.
- Operating voltage pins are on the outside.

(https://www.ultimarc.com/images/detailed/1/UIO_top.jpg)

Looking at your wire colors, both sides appear to be in the same order with the blue wires on the right.
- The blue wires are inside on pins 1-48 and outside on pins 49-96.

(https://i.imgur.com/3zMbIlS.jpg)

Try turning the Dupont connectors 180 degrees on the side with pins 49-96 so the blue wires are toward the inside of the board.   :cheers:


Scott
Title: Re: What would cause the entire left side of my Control Panel’s LED’s to not work?
Post by: Nephasth on April 19, 2022, 11:28:57 am
Quote from: bobbyb13 on April 19, 2022, 12:33:18 am
Loose ground is first thing to check.
If it is one continuous loop then trace until you find a break.

RGB LEDs don't share a common ground like button switches. Each color of an RGB LED has it's own ground. And the colors are controlled by switching those grounds on and off, or by altering resistance between the LED and Ground. RGB LEDs can share (daisy chain) power. However, this is not the case in this instance. Scott's got a good eye.
Title: Re: What would cause the entire left side of my Control Panel’s LED’s to not work?
Post by: obizues on April 19, 2022, 11:43:13 am
Quote from: PL1 on April 19, 2022, 06:29:27 am
If you look at the lower left and right of the Ult. I/O PCB, you'll see that the left LED pin columns are labeled "+RGB" and the right LED pin columns are labeled "BGR+".
- Blue pins are on the inside.
- Operating voltage pins are on the outside.

This was it! :banghead:
Title: Re: What would cause the entire left side of my Control Panel’s LED’s to not work?
Post by: bobbyb13 on April 19, 2022, 01:13:04 pm
Scott is pretty tough to beat on this stuff!
Learn something every day.
 :lol
Title: Re: What would cause the entire left side of my Control Panel’s LED’s to not work?
Post by: PL1 on April 19, 2022, 06:13:22 pm
Quote from: Nephasth on April 19, 2022, 11:28:57 am
Scott's got a good eye.
Thanks, Neph.   :cheers:

Quote from: obizues on April 19, 2022, 11:43:13 am
This was it! :banghead:
Glad to assist.   ;D


Scott