tidbit-led-debugging
We should still be able to fix it, I think! I’ll start a thread. Good debugging so far, I actually think you’re hot on the trail.
29 Replies
So, first question! Do you happen to have a multimeter? It’s definitely possible to diagnose a connection that should be there but isn’t, and then jump it with some thin wire. It seems like that might be what’s going on.
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Yo no worries, perfect opportunity 🙂
I have a good “what the heck is this thing” video lol, lemme find it.
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Amen amen! I have ruined plenty of surface mount stuff, it sucks and is zero fun
It’s a deep pit of despair
iFixit
YouTube
Basic Skills!: Multimeter
Check out part 4 of our basic skills videos! Today we will be covering basic Multimeter skills!
Every fixer should know their way around a multimeter, which has a million uses for testing electronic components and circuits. Today we will go over three of the most basic functions of a multimeter starting with testing continuity.
Get your Mult...
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Basically, after you brush up on the basics: we’ll want to diagnose whether two pins are connected, which is usually done with resistance or continuity mode. I’ll point you to which pins should be connected on the LEDs, and you can probe each end, and if they aren’t, we have found the issue!
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Let me also send a diagram of the LEDs as viewed from the top, it shall be helpful
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
OKAY, first thing to test: on the first LED, check that the VDD pin has continuity to the +5V pin as show in the diagram in #diagrams-etc. reminder that the pinout shown will be “flipped” since you’ll be looking at the bottom of the PCB.
You’ll want the board unplugged for all of this, by the way, and the red lead on the MCU pins, black lead on the LED.
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Great! Next up: the VSS pin to the ground pin on the MCU.
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Either will work, they are connected within the Bit-C and PCB 👍
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Sweet! Next up: the RGB_2812 pin and the DI pin on the LED.
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Interesting! Based on all those measurements at least the first LED should be on. I’m extra intrigued now…. You were mentioning that your VIA wasn’t showing the LED panel too, right? Out of curiosity, where exactly is the firmware you’re flashing coming from? I’m wondering if the underglow is disabled or something (no glue, just curiosity at this point)
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
I don’t think it does, but maybe? If the LEDs are toggled off, I wonder if it stays that way in internal memory. You might want to use the “clear EEPROM” button in toolbox and then reflash default!
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Awwww yeah! Success! That’s what I’m talking about!
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
You have just solved a particularly thorny issue, that was NOT at all obvious or clear why that would be the case. Score!!
Unknown User•3y ago
Message Not Public
Sign In & Join Server To View
Nice, that’s what I’m talking about 👍