Author Topic: Identify and replace shortened components - Focusrite 2i4 2nd gen  (Read 230 times)

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Offline luchomatic

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Hi!

I'm an electronics enthusiast with very bad luck, yesterday during a thuderstorm a ligthing came through my window and fried my PC motherboard, I had my Focusrite 2i4 2nd gen audio interface connected through USB to the motherboard and it fried it as well.

It won't turn on or give any light

I dissasemblied it and connected it to the USB cable and I noticed that the first capacitor out of a set of 3 that are the first components on the USB power path has a black mark on top, and it overheats to a point that I can't touch it for more than a second.

This capacitor doesn't have numbers on it, it just says "CAREFV." or "CAREFU." I'm not sure.

The other black capacitor that is shown in the image on the right seems to be the same one as the overheating one, it hast the same label shape and size.

The rest of the components are just cold.

How can I identify the capacitor to ask for a replacement?

Is it possible that the capacitor is messed up and if i replace it the Focusrite will come back to life?

Gallery with more images
https://imgur.com/a/0MB4G9U

Thanks in advance!
« Last Edit: April 27, 2020, 01:10:06 am by luchomatic »
 

Online Manul

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Re: Identify and replace overheating capacitor - Focusrite 2i4 2nd gem
« Reply #1 on: April 26, 2020, 06:14:39 pm »
It is an inductor, not a capacitor, so there is no need to change that. Look for a short in 5V path.
 
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Offline james_s

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Re: Identify and replace overheating capacitor - Focusrite 2i4 2nd gem
« Reply #2 on: April 26, 2020, 06:18:38 pm »
I'd bet there's a shorted semiconductor somewhere in there, probably one of the voltage regulator ICs or if you get lucky there might be a transient protection diode that has failed.
 
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Online Manul

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Re: Identify and replace overheating capacitor - Focusrite 2i4 2nd gem
« Reply #3 on: April 26, 2020, 06:21:13 pm »
D21 looks suspicious. Measure the 5V rail with a multimeter, I bet you have a short.
 
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Offline luchomatic

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Re: Identify and replace overheating capacitor - Focusrite 2i4 2nd gem
« Reply #4 on: April 27, 2020, 01:06:14 am »
Thank you for your answer!

I studied some more and did another test like you suggested and found that the "ij16" or "1j16" semiconductor is extremely hot. I added two pictures to the gallery on top to show this component. Should I buy one and replace it? or what's the usual procedure to fix a circuit board like this one?

https://imgur.com/a/0MB4G9U
 

Offline luchomatic

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Re: Identify and replace shortened components - Focusrite 2i4 2nd gem
« Reply #5 on: April 27, 2020, 01:07:38 am »
You were right!

I just added 2 pictures on Manul reply showing the semiconductor that overheats extremely, how do you think I should proceed now? just replace it? or is there anything else I should do before ordering it?

Thanks again!
 

Online Manul

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Re: Identify and replace shortened components - Focusrite 2i4 2nd gen
« Reply #6 on: April 27, 2020, 01:52:52 am »
That is U16 (U marking means IC's). It is MP2159GJ. It is probably bad, so yeah, you should replace. But the thing is that thunder is extremely unpredictable thing and there is no guarantee, that there is no more damaged parts.
 


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