Twistplot
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Joined: Wed Apr 01, 2020 12:38 pm

More a Hardware Problem

Wed Apr 01, 2020 1:31 pm

Hey Guys,

I bought an Raspberry Pi 4 Model B a few days back and installed Klipper and OctoPrint on it to run my 3D-Printer.
When I tried to screw it into the mounting, I accidentally slipped off with my screwdriver and hit the small parts between the power supply and the LED Lights (right above the lettering: PWR).
Is it even possible to replace the broken parts?
And if, can anybody tell me what I have broken?

Many thanks in advance

RGJ-PI
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
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Re: More a Hardware Problem

Wed Apr 01, 2020 1:52 pm

If you, or someone you know, has the tools to replace surface mounted components then yes, it potentially can be saved. A high res close up photo of the damaged area would be rather useful to answer your repair question. As well as showing damaged components would need to know if the PCB tracks and/or component pads have been lifted.

George441
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Re: More a Hardware Problem

Wed Apr 01, 2020 10:53 pm

Twistplot wrote:
Wed Apr 01, 2020 1:31 pm
Hey Guys,

I bought an Raspberry Pi 4 Model B a few days back and installed Klipper and OctoPrint on it to run my 3D-Printer.
When I tried to screw it into the mounting, I accidentally slipped off with my screwdriver and hit the small parts between the power supply and the LED Lights (right above the lettering: PWR).
Is it even possible to replace the broken parts?
And if, can anybody tell me what I have broken?

Many thanks in advance
Would you please send us a photo of that?
It will help us to detect the problem easier.
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Twistplot
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Joined: Wed Apr 01, 2020 12:38 pm

Re: More a Hardware Problem

Thu Apr 09, 2020 12:02 pm

Hey,
First thanks a lot for the quick respond, that's awesome and I really appreciate it!!
I'm sorry that I text you back so late. I had some trouble with my study that I had to take care of.
I really hope for your comprehension. (hope you can say it like that)
I attached a photo of my broken Raspberry.
Attachments
Broken_Raspberry_4.zip
Borken Raspberry Pi 4
(254.35 KiB) Downloaded 32 times

Heater
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Re: More a Hardware Problem

Thu Apr 09, 2020 12:13 pm

Would it be so hard to attach the photo(s) here directly as inline images? I for one am not about to start messing around with zip files for this.
Memory in C++ is a leaky abstraction .

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bensimmo
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Re: More a Hardware Problem

Thu Apr 09, 2020 12:19 pm

Heater wrote:
Thu Apr 09, 2020 12:13 pm
Would it be so hard to attach the photo(s) here directly as inline images? I for one am not about to start messing around with zip files for this.
IMG_0691 (Medium).jpeg
IMG_0691 (Medium).jpeg (246.26 KiB) Viewed 2322 times

Twistplot
Posts: 6
Joined: Wed Apr 01, 2020 12:38 pm

Re: More a Hardware Problem

Thu Apr 09, 2020 12:29 pm

Sorry Heater I tried to attach the photo directly. Unfortunately, there was always an error report, when I tried, that the file was to big.
Thanks for the photo Bensimmo.

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bensimmo
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Re: More a Hardware Problem

Thu Apr 09, 2020 12:38 pm

Twistplot wrote:
Thu Apr 09, 2020 12:29 pm
Sorry Heater I tried to attach the photo directly. Unfortunately, there was always an error report, when I tried, that the file was to big.
Thanks for the photo Bensimmo.
you were 257kB and it needed to be 250kB or less

gordon77
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Re: More a Hardware Problem

Thu Apr 09, 2020 12:41 pm

It's hard to identify components exactly with no full schematics and layouts, but my guess would be L4 and C10/11/14.

Maybe someone can confirm.
Attachments
IMG_20200409_133829.jpg
IMG_20200409_133829.jpg (245.32 KiB) Viewed 2293 times
Last edited by gordon77 on Thu Apr 09, 2020 12:55 pm, edited 1 time in total.

Twistplot
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Joined: Wed Apr 01, 2020 12:38 pm

Re: More a Hardware Problem

Thu Apr 09, 2020 12:48 pm

257KB that was really close. I tried already to put the size down but thought it had to be really small and then you can't see anything because its just one pixel, so I thought a zip would work better.
I will remember it for the next time. Thanks bensimmo

Twistplot
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Re: More a Hardware Problem

Thu Apr 09, 2020 12:55 pm

Thanks gordon77, I had a bit of electrical engineering in my study but I really can't handle such (for me) complicated diagrams.

gordon77
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Re: More a Hardware Problem

Thu Apr 09, 2020 1:04 pm

Twistplot wrote:
Thu Apr 09, 2020 12:55 pm
Thanks gordon77, I had a bit of electrical engineering in my study but I really can't handle such (for me) complicated diagrams.

Looking closer at chip pin numbers it could be L3 and C8 but they are the same values as L4 and C10 (if not the spec).

Attached my assumption of components (tbc)
Attachments
Pi4psu.jpg
Pi4psu.jpg (47.36 KiB) Viewed 2197 times
Last edited by gordon77 on Thu Apr 09, 2020 2:40 pm, edited 2 times in total.

LTolledo
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Re: More a Hardware Problem

Thu Apr 09, 2020 1:41 pm

I can replace the capacitor with the same value, but different form factor
I cannot replace the 470nH inductor, as the nearest value available (at my fave store) is 30nH

so if that happened to me..... I'd get a new one immediately and save me all the trouble of doing a fix
...and place the damaged RPi4 in a picture frame and display it in the room. :mrgreen:
"Don't come to me with 'issues' for I don't know how to deal with those
Come to me with 'problems' and I'll help you find solutions"

Some people be like:
"Help me! Am drowning! But dont you dare touch me nor come near me!"

Heater
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Re: More a Hardware Problem

Thu Apr 09, 2020 2:31 pm

If it were me...

Before that poor mistreated Pi gets thrown in the bin I would:

1) Solder a short across the pads where the inductor was. It's only an inductor, probably for blocking high frequency noise or some such. The Pi may well work without it. The short will let the required DC through.

2) Forget about the capacitor. That is only decoupling. Bah, who needs that?

Power it up and see how she flies. If not, in the bin she goes.
Memory in C++ is a leaky abstraction .

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davidcoton
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Re: More a Hardware Problem

Thu Apr 09, 2020 3:05 pm

Heater wrote:
Thu Apr 09, 2020 2:31 pm
If it were me...

1) Solder a short across the pads where the inductor was. It's only an inductor, probably for blocking high frequency noise or some such. The Pi may well work without it. The short will let the required DC through.

2) Forget about the capacitor. That is only decoupling. Bah, who needs that?
I think you would be wasting your time, and end up disappointed. Those are key components in a switching voltage regulator.
Location: 345th cell on the right of the 210th row of L2 cache

Heater
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Re: More a Hardware Problem

Thu Apr 09, 2020 3:10 pm

davidcoton wrote:
Thu Apr 09, 2020 3:05 pm
I think you would be wasting your time, and end up disappointed. Those are key components in a switching voltage regulator.
Ah, you mean that thing on the left is a switcher chip? On a quick glance I thought I was looking at something going in and out of the USB connector, seeing as it's very near by.

In that case yeah, no chance, forget it.
Last edited by Heater on Fri Apr 10, 2020 8:31 am, edited 1 time in total.
Memory in C++ is a leaky abstraction .

Twistplot
Posts: 6
Joined: Wed Apr 01, 2020 12:38 pm

Re: More a Hardware Problem

Thu Apr 09, 2020 10:27 pm

Well its not that I mind the afford... but you all seem to have the same opinion, so it's probably not fixable.
Thank you all for your help, I really appreciate it!

gordon77
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Re: More a Hardware Problem

Fri Apr 10, 2020 6:41 am

I would have had a go.

Maybe practice by having a go at cleaning off the damaged parts left behind....and then if confident at it try finding and getting the parts..and try fitting them..

What's to loose ?

But anyway your choice, you know your skills etc.

ejolson
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Re: More a Hardware Problem

Fri Apr 10, 2020 7:01 am

gordon77 wrote:
Fri Apr 10, 2020 6:41 am
I would have had a go.

Maybe practice by having a go at cleaning off the damaged parts left behind....and then if confident at it try finding and getting the parts..and try fitting them..

What's to loose ?

But anyway your choice, you know your skills etc.
Maybe the broken-off parts are still lying on the floor and in a usable condition if simply reattached.

Heater
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Re: More a Hardware Problem

Fri Apr 10, 2020 8:52 am

Personally I would be up for having a go fixing it. I have always maintained that Pi owners should learn to solder.

However, for someone who is not prepared it becomes quite a challenge, time sink and expense:

One will need obtain:

A soldering iron, preferably hot air station.
Solder.
Flux.
Solder wick.
Perhaps a USB micro-scope or jewelers loupe.
Tweezers.
The replacement parts. Preferably more than one of each in case of mishap. The cheapest part of the whole exercise.

Looking at those parts on my Pi I recon I could just about pull it off with my iron. Assuming the PCB pads and tracks are not ripped up. I have manged that size of SMD before, even with my big wobbly hands and terrible eyesight.

But starting from scratch i might be more time, effort and expense than it is worth. Unless one is keen on trying just for fun. Which is no bad thing of course.
Memory in C++ is a leaky abstraction .

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davidcoton
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Re: More a Hardware Problem

Fri Apr 10, 2020 10:52 am

^ +1
If you can get the parts without too much hassle, it's worth a go.
Location: 345th cell on the right of the 210th row of L2 cache

Heater
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Re: More a Hardware Problem

Fri Apr 10, 2020 12:31 pm

It would also be worthwhile watching some experts demonstrate how to do Surface Mount Device (SMD) Soldering.

For example Dave Jones has a few such vids on YouTube : EEVblog #346 - MLF/QFN SMD Reflow Soldering https://www.youtube.com/watch?v=M_rO6oPVsws

As does Louis Rossmann: Replacing SMD components without burning neighboring connectors without hot tweezers: https://www.youtube.com/watch?v=XW9aEkToX8w
Memory in C++ is a leaky abstraction .

LTolledo
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Re: More a Hardware Problem

Fri Apr 10, 2020 1:35 pm

Heater wrote:
Fri Apr 10, 2020 8:52 am
Personally I would be up for having a go fixing it. I have always maintained that Pi owners should learn to solder.

However, for someone who is not prepared it becomes quite a challenge, time sink and expense:

One will need obtain:

A soldering iron, preferably hot air station.
Solder.
Flux.
Solder wick.
Perhaps a USB micro-scope or jewelers loupe.
Tweezers.
The replacement parts. Preferably more than one of each in case of mishap. The cheapest part of the whole exercise.

Looking at those parts on my Pi I recon I could just about pull it off with my iron. Assuming the PCB pads and tracks are not ripped up. I have manged that size of SMD before, even with my big wobbly hands and terrible eyesight.

But starting from scratch i might be more time, effort and expense than it is worth. Unless one is keen on trying just for fun. Which is no bad thing of course.
in my case:
maybe as time goes by... I'd be itching again to "try to fix" the damaged RPi4B encased in the picture frame
the sort of "you won that time.... this time I'll win this challenge!" feeling coming out.... :mrgreen:

and if the repair turned out to be a success.... sense of pride and victory sets in..... the "what a feeling!" moment. :D
if the repair did not turned out well... its just back to the picture frame... or worse, the "parts bin".... ;)
"Don't come to me with 'issues' for I don't know how to deal with those
Come to me with 'problems' and I'll help you find solutions"

Some people be like:
"Help me! Am drowning! But dont you dare touch me nor come near me!"

Heater
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Joined: Tue Jul 17, 2012 3:02 pm

Re: More a Hardware Problem

Fri Apr 10, 2020 3:26 pm

That's the spirit.
Memory in C++ is a leaky abstraction .

ejolson
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Re: More a Hardware Problem

Fri Apr 10, 2020 4:31 pm

Heater wrote:
Fri Apr 10, 2020 3:26 pm
That's the spirit.
I see what looks like the inductor here

Image
https://www.mouser.com/Passive-Componen ... ?P=1z0wqjh

Is one of those correct? What current rating would one need?

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