I just wired up my 3rd up2stream2.1 board and got surprised with a huge “plop” in the speakers everytime I connect the battery to the device.
I know them plopping slightly when disconnect power, but on connecting power my other 2 boards make no sound until some content is being played or the internal voice is telling me “connected to your wifi network”
Its the only board that does this loud sound while switching on.
I forced updating the device via API command and its now on latest alpha from raokit.
I did factory reset before and after the update.
No change of that plopping behavior.
May I have a faulty board?
On visual inspection the board looks fine.
Hi, how did you found the correct way to fix this? Did you reverse engineer the old and new PCB? Fascinating!
@zpl1025 Can you somehow acknowledge this is the right fix? I have two boards which also try to trash my subwoofer each time I attach power. I could apply the same fix to my boards, but maybe you can tell us why you removed the resistor and nothing will be broken when we add this resistor back.
Hi, this is the right fix, before we soldered this 10K resister manually to fix issue. And should have updated the PCB for the future orders, could you check the date on the PCB? so I can check it.
Hi, thank you for your reply! I will add the resistor in the next days, I think a 0603 will fit.
PCB date is 2020-6-5 for the amp 2.1 v1. I bought two of them in the last weeks in Germany. Despite the old PCB date they came with firmware 4.6.415145.44, which seems to be the newest one available (they did no auto update on first bootup). On https://developer.arylic.com/firmware/ v35 is listed as latest firmware
I am fairly new to working with PCB’s like this. Is the added resistor just going to ground? Or is it connected to one of the traces shown in the image. How would I go about adding this?
@zpl1025 Could you provide clarification on where the resistor terminates? Is it going to the near or far trace in that image? Or just to the ground layer?
Where did you spot the resistor? I had to send my board back for warranty and they sent me a new board. Before I add a resistor I would like to know where to look.
It your post you said, “I spotted an additional 10k resistor on my good working boards which the newer boards dont have.”
I’m asking, where on your “good working boards” did you “[spot] an additional 10k resistor”? I know where you added a resistor to make the popping stop. I’ve done the same and it worked. Was the resistor on the “working boards” in the same location as the one you added or was it in another location?
Yes! It was added by the manufactor at this place.
They must have recognized the issue themselves before.
Maybe they forgot to give forward that important information at some point.
