How to repair your N2

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zyssai
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How to repair your N2

Post by zyssai »

Hi everyone :)

Today I received a huge package :lol:

Image

Everyone of them are faulty.
This can be either no power, USB ports not working, broken components (some coils, an audio port, missing spi switch, USB port damaged,...), and probably something else.

I just tested one and faced a working N2 except USB ports faulty.

So when I will have time to, I will try to do a tutorial for every different situation, if it can help any of you to repair your Odroid.

I will update this first post everytime one is repaired, with the link pointing to it.

Stay tuned ;)
Last edited by zyssai on Sat Feb 10, 2024 5:56 pm, edited 1 time in total.

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Re: How to repair your N2

Post by mctom »

What a lucky purchase :O
I did the same once with RasPis, fixed some of them. It was harder without access to schematics. But most of them I sold again, because they had damaged SoCs, mostly.

Let me know if that guy still has a few more N2s for repair, I'll make a cluster from them. ;)
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Re: How to repair your N2

Post by zyssai »

mctom wrote:
Wed Jan 31, 2024 9:27 pm
What a lucky purchase :O
I did the same once with RasPis, fixed some of them. It was harder without access to schematics. But most of them I sold again, because they had damaged SoCs, mostly.

Let me know if that guy still has a few more N2s for repair, I'll make a cluster from them. ;)
Yes, I looked at some, because I actually need them to install on some Renault Laguna 3 drivers who want the same installation as mine, and found this batch at around 100$, I think I made a great deal :)

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Re: How to repair your N2

Post by L67GS »

Wow, that's a great deal for sure
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zyssai (Wed Jan 31, 2024 10:19 pm)

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Re: How to repair your N2

Post by zyssai »

So I picked up one of them, and I found one missing component (probably knocked off).

I have difficulties to read silkcreen so I'm not sure what component it is.

Image

Image

According to schematic, I thought it to be C176, but it does not really correspond because output of C176 seems to go to just one pad, and that's not the case in the schematic.
If I read it correctly, R72 is also missing and R73 seems to be desoldered.

Is there any pcb schematic available? This way it would be easier to find component listing :)

Edit: Just a note for further revisions, C216, R110 and R111 should be placed differently as the whole batch I have here have destroyed components due to IR receiver lying down to them.

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Re: How to repair your N2

Post by mctom »

It's even hard to tell what are the pin numbers of this chip. :)
C181 helps determine which is number 1, from there I assume they are numbered counter clockwise, as usual.

So missing components were connected to pin 11.
Trace from pin 11 branches in three ways, just like on the schematic.
Lower branch consists of two components in series, with no branches, leading to a thick trace that I assume is VDDCPU_A. So these two could be R73 and R74.
Upper branch resembles the part that you put in purple box.
So the two missing components could be R72 and C176. This could be right as capacitors are often larger than resistors.

I suspect that R71 is the resistor two positions under the footprint circled in red. It should have 499kOhm and its right side connected to a midpoint between R72 and C176, to confirm my assumptions.
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Re: How to repair your N2

Post by zyssai »

mctom wrote:
Thu Feb 08, 2024 5:54 pm
I suspect that R71 is the resistor two positions under the footprint circled in red. It should have 499kOhm and its right side connected to a midpoint between R72 and C176, to confirm my assumptions.
I'm surprised by the size of the via at the right of R71, I did not saw it :shock:
So there should probably have the same between R72 and C176.
Thanks for your investigation.
I will test at next time gap :lol:

I have 2 N2 working in this batch.
One with the audio jack to be replaced, and one with 2 broken inductors, I will replace them.

Image

Here's what's the seller answers to me when I asked where do they come from.
Hello, these cards were intended to make them work in video processing machines, there were some which had broken down due to the fact that there were too many USB port problems, they were all replaced for a software and card update by raspberry pi 5 which has more compatible libraries, these cards were intended for the recycling center. I got them back more than a year ago but not having the time to take care of them I gave them as is because there have been some attempts at repair but I don't have a reliable BGA machine they are not not all repairable.

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Re: How to repair your N2

Post by zyssai »

Does anyone know if these resistors (R72 and R73) are 0402 or 0201 before I order?

I think C176 could be 0805 as this is the most usual.

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Re: How to repair your N2

Post by mctom »

It's a shame such things are disposed of instead of sold regularly. All those Wyse computers I got were from recycling center, not the entity that originally owned them.
And all were working just fine! I think the reason for replacing them was because Dell said so. :?
(They lost official support quite early).

I compared components with a known dimension on the photo, 2.54mm between two pin pads.
I think these are 0201 and 0402.
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Re: How to repair your N2

Post by zyssai »

Yes, I already told the seller to let me know if it has other batchs to sell :)

Thanks. Good idea to use pads for reference.
That's confirm it, I just thought capacitor to be 0805, but it seems so huge with microscope :lol:

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Re: How to repair your N2

Post by mctom »

I wanted to propose buying some from you, those that you couldn't fix, but then again I think you will repair them all. Burnt SoCs are unheard of in N2 series, unless they let ESD zaps through GPIO.

I wanted to build a N2 cluster in my military laptop shell, but I already built another and don't have time to configure it. :D
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zyssai (Sat Feb 10, 2024 5:54 pm)
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Re: How to repair your N2

Post by zyssai »

Let me know if you really need some my friend. I did not even check all of them, but it not seems there is some SOC or reball faults.
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mctom (Sat Feb 10, 2024 6:15 pm)

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Re: How to repair your N2

Post by zyssai »

So I received some parts, and then replaced broken inductors from the previous picture.

I also replaced GL3523 chip due to non-working USB ports.

I am always waiting for some other parts, especially resistors/capacitors books.

I have one N2 with a burned diode, and cannot find a replacement part.
According to schematic, D19 is FTV15BU32.
But my knowledge is limited for finding a similar part. I already desoldered it and I don't really know why it burned. DC power plug is not shorted to ground.

Image

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Re: How to repair your N2

Post by mctom »

This is TVS, or Transient Voltage Suppressor, a bidirectional variant. Just like its electrical symbol suggests, this behaves like two Zener diodes connected together in series and opposing each other. The internal design is optimized for reaction speed and surviving short but powerful current pulses.

This element passes current through itself whenever predetermined voltage is exceeded, see the graph below. This particular TVS is rated at 15V, as its part number suggests. When voltage reaches VRWM=15V, then it starts allowing the current to flow through it. And it works in both directions symmetrically.

It is used for clamping voltage to save levels, against electrostatic discharges, which manifest themselves as temporary appearance of 8000V, or even more. This diode is supposed to protect N2 internals against it.

Most semiconductors are shorted when they fail, especially MOSFETs. This diode must have failed, and be continuously supplied with power until it completely burned out and became open circuit.
The only way to destroy this diode is to supply N2 with voltage exceeding 15V. Perhaps this is what they've done. Nevertheless, N2 should work without it, because this is only a protective device. If not, I think they destroyed power converters too.

To find an equivalent, let's focus on its key parameters:
- SOD-323 package
- Vrwm - Working Peak Reverse Voltage: 15V
- Ppp - Pulse Peak Power: 320W or more

Here's a Mouser filter with these requirements applied. Any of these should be fine.
https://www.mouser.pl/c/semiconductors/ ... issipation
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Re: How to repair your N2

Post by zyssai »

You amaze me :D

I was pretty sure tho that I could try it, but prefer to wait any specialist advice.
I think that there was a wrong power adapter usage (a laptop one?).
I have not found any short on this board, but will double check it and order the one I have found easily, SD15C-01FTG.

Thanks!

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