I’m using a pixelblaze in a large project that’s going to a festival in 2 days and I ran into an issue that’s really stressing me out.
I was getting the system all set up to test out, and shortly after I supplied power, a component (U1, 63P) on the Pixelblaze released it’s magic smoke. I’m almost certain it’s the 3.3v regulator. Not exactly sure in what order I did things that caused it.
Fortunately, I have a friend with a PB that he’s lending me, but I’m running into the same issue and it’s really baffling me.
This time I plugged things in slowly and carefully with my finger on the regulator.
1 - supplied 5v power to full chain (w/o PB), checked voltage to make sure it stayed 5v.
2 - supplied 12v power to full chain (still w/o PB), except for the first board (no reason, I just forgot to wire it in)
3 - powered down, added PB, powered up. Everything looked good.
4 - Then I noticed the first driver wasn’t powered by 12v, so I fixed that.
5 - When I reconnected power, the regulator immediately got really hot, so I quickly disconnected power.
6 - started to disconnect everything while checking to see at what step the regulator would stop overheating when powered.
Now the regulator is overheating with nothing at all attached to the PB, just plugged into usb. Although it’s not heating nearly as fast.
Is the regulator compromised and will always overheat now?
Most importantly though, what caused the issue?
There are 53 drivers in the chain.
None of the LED strips were plugged in at the time.
PWM Driver board:
PWM IC Datasheet: