Author Topic: Can I replace this SMD electrolytic cap with a thru hole cap ?  (Read 491 times)

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Offline guixTopic starter

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Can I replace this SMD electrolytic cap with a thru hole cap ?
« on: October 15, 2024, 10:50:07 pm »
Hello,

I have this broken smd cap for a stepper motor driver on a 3d printer motherboard, unfortunately one leg is broken, and I don't have a similar capacitor at hand.

But I have thru hole capacitor of the same value (also marked "low esr, -40+105°C"), so can I use it instead or is it not recommended ?

2403449-0
« Last Edit: October 15, 2024, 10:51:40 pm by guix »
 

Offline TimFox

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #1 on: October 15, 2024, 10:54:52 pm »
It should work: how would you secure it mechanically?
 
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Offline David Hess

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #2 on: October 15, 2024, 10:59:14 pm »
It will work fine if you can figure out how to attach it.  I have done it by cutting the leads to leave just enough clearance to get a soldering iron tip to the pad, which is not the best mechanically, but good enough in most repair applications.
 
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Offline guixTopic starter

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #3 on: October 15, 2024, 11:00:17 pm »
The pads on the board are also broken :)

I plan to place the capacitor laying on its side (like it is on the picture), solder the + to the diode just below and the - to the nearest ground (or I remove the silkscreen near the "creality" logo), making the legs as short as possible, then hot glue so it can't move

Thanks :)
 

Offline erikbrenn

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #4 on: October 15, 2024, 11:07:33 pm »
Yes you can, but besides the capacitance beware its temperature and voltage rating. Also, some caps are low ESR for a reason.
I usually just use high temperature silicon to keep them in place.

For the broken pads you just need to scrape off some solder mask to find new copper.



 
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Offline coromonadalix

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #5 on: October 15, 2024, 11:21:14 pm »
you have some pads left, search where they go and solder a cap on the part destination, nearby diode  etc ....
 
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Offline guixTopic starter

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #6 on: October 16, 2024, 12:02:12 am »
That should do it :)

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Online The Soulman

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #7 on: October 16, 2024, 12:09:09 am »
Bodge's your uncle.
 
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Offline inse

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Re: Can I replace this SMD electrolytic cap with a thru hole cap ?
« Reply #8 on: October 16, 2024, 05:31:13 am »
This is how you do it.
Replacing the copper pads only for the looks of it - waste of time
 


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