A collection of random notes about repairing the 3rd gen Scarlett 4i4 USB audio interface. TLDR : 3.3v regulator often fails short, sending 5V where it shouldn't (i.e. the CPU). More details on my website, qcte.ca/audio/...
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@celestinbeya829127 күн бұрын
What Can cause a sound card to fail? Sencondly I Can know if a part from sound card driver there is some thing else to add because I use Scarlett 18i8 1st génération in the computer from mixcontrol I see the Output signal when I play music but that does not don't come out to the baffles
@HhHi-l6l25 күн бұрын
Is it possible to solve this problem, guys? With your permission, I have a FoxRate 4i4 sound card with a connection to the device. A computer connects to electricity and a light, but it does not send any data to the computer, but I am connected at all and the computer does not sense it. Even the USB mark on the card does not light up. What is the reason and what is the problem with that? I have a card for the second hour and I can't connect it to the SP tag and the device is reading and the data came to me and the laptop does not receive any signal.
@HhHi-l6l25 күн бұрын
ممكن حل المشكله دي يا جماعه بعد اذنكم عندي كارت صوت فوكس ريت 4i4 بوصله على الجهاز كمبيوتر بيوصل كهرباء وبينور ولكن ما بيديش اي بيانات للكمبيوتر ولكني متوصل اصلا ولا الكمبيوتر بيحس بيه حتى علامه اليو اس بي اللي في الكارت ما بيتنورش ايه السبب وايه المشكله مع ان معايا كارت ثاني ساعه ما بوصله بينور علامه الاس بي والجهاز ببقراء الي يعرف الحل يكلامني
@alexp89462 ай бұрын
Thanks for the video. Would you say generally replacing U31 3.3v regulator & U27 XMOS processor would fix it? Also for U31 (3.3v reg) do you think MP1605 is better choice as it can handle 2a output? Cheers.
@fenugrec56972 ай бұрын
U31 and U27 definitely as a minimum; 1V reg should not be impacted but worth checking before installing the new U27 obviously. Clock gen and SPI flash , to my knowledge, are the only other things that could in theory suffer from a shorted 3v3 rail but are usually OK ?. I understand MP1605 and MP2141 is essentially the same silicon, maybe some packaging differences. I'd be really curious to talk to focusrite and MPS engineers to see what's up with all this...
@alexp8946Ай бұрын
I'm ordering the parts for mine now from Focusrite and they have these available for the 4i4: Part Number: SEMS002022 (U27) Description: STEP DOWN CONVERTER SYNCHRONOUS 1A MP2141NGTF ADJUSTABLE "MPS" Part Number: SEMS002049 (U31) Description: XU216 QFP128 CPU 256K RAM 2-TILE 16-CORE 1000MIPS ENCRYPTED Part Number: DDES001001 (U33) Description: DIODE SOT23-6 ESD PROTECTION "SEMTECH" RCLAMP0504S.TCT Notice that 2 are the ones you replaced. They also mentioned a service bulletin for the 4i4 3rd gen so trying to get a copy of that as well which might provide more insights.
@fenugrec5697Ай бұрын
Oh wow that's the first I hear about a service bulletin, let me know if you get a copy of it !
@notpanda_prodАй бұрын
Thanks for the info. I just recently bought a used Focusrite and after a few minutes of regular use (spotify) it turned off. Now when i plug it in, some lights turn on for 1 sec and then it turns off. Anyway you could help this fooled soul? Cheers.
@fenugrec5697Ай бұрын
Try a few different cable(s) , computer / hub / port combinations.
@notpanda_prodАй бұрын
@@fenugrec5697 tried everything. unfortunately, no luck. Is there a way you could show me what to measure exactly to identify the exact problem? I have a multimeter and would be more that happy to learn about this topic :). Went to your page but no further explanation on the subject :(. Hope you can help me.
@fenugrec5697Ай бұрын
Hi, unfortunately what I have on my website is about the maximum amount of detail I had energy to explain. I reasoned that replacing the CPU is a challenging task that would realistically only be undertaken by somebody with the knowledge to probe around and troubleshoot; as I may have stated in the video definitely not an easy repair, although the troubleshoot itself is not terrribly complex. More that can fit in a comment reply, anyhow. If you still want to pursue this, go to that page on my website, look up the datasheet for the problematic components, and try to figure out which voltages are where. Probing voltages (carefully) in a defective 4i4 is essentially harmless at this point
@MiddasАй бұрын
Try downloading the drivers for the interface
@notpanda_prodАй бұрын
@@Middas no luck :(
@user-pf9pm8ox1k3 ай бұрын
Zener power protect 3.3V uC?
@fenugrec56973 ай бұрын
A single zener isn't ideal for this : you would want near-zero conduction at 3.35V, and "full" at 3.5-3.6V. Low voltage zeners have a very soft knee, look at datasheet curves for example BZT52* or 1N53* . Also, power rating would be a challenge, since a shorted buck regulator means the zener is conducting between VUSB rail and ground.
@TheRichiedagger2 ай бұрын
They draw 3.2A peak? Focusrite site says it needs 900mA to work. I guess thats why it keeps dosconnecting even if i have it plugged to a 1.5A powered hub port
@fenugrec56972 ай бұрын
well, in my measurements, it's a relatively short peak, and on average it is definitely below 900mA. I expect high inrush scenarios like this are handled quite differently depending on the hub. Also, with 3A peaks, voltage drop over the cable and contact resistances is also noticeable. I could've gone into more detail on my current measurement (resistive shunt) which also affects the peak amplitude and duration.