Re: Soekris-tech Digest, Vol 161, Issue 1

I'll certainly give it a try. I've got a stack of them.

Thanks.

On 2018-02-15 06:00, [email protected] wrote:
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> Today's Topics:
> 
>    1. How I fixed a dead net6501 (Red Light Of Death) (Paride Legovini)
>    2. Re: How I fixed a dead net6501 (Red Light Of Death)
>       (Denis Fondras)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 15 Feb 2018 10:11:31 +0100
> From: Paride Legovini <[email protected]>
> To: [email protected]
> Subject: [Soekris] How I fixed a dead net6501 (Red Light Of Death)
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=utf-8
> 
> A few months ago I bought myself a bargain net6501 off ebay to be used
> as home router. It was working flawlessly with OPNsense, but at some
> point after a reboot it was stuck with the infamous RLOD this list 
> knows
> very well. The symptoms were the classical ones for bad capacitors:
> 
>  - random failure to reach POST;
>  - works by retrying several times;
>  - works after several hours unplugged;
>  - degenerative problem.
> 
> To a visual inspection all the caps appeared in good conditions,
> nevertheless I bought a full set of caps (the electrolytic ones,
> included the "solid state" polymer electrolytics).
> 
> Yesterday night I began to replace them, starting from the usual
> suspects: the two 35V 150uF electrolytics between the inductors, near
> the power connector. After replacing them I tested the board and, guess
> what, now it never fails to boot. Fixed!
> 
> The capacitance of the two caps I removed is about 155uF, so well 
> within
> the specs. They probably dried out and the ESR rose.
> 
> This is the exact model I bought:
> 
> http://deb.li/DXm1
> 
> Note the very long working life (7000 hours, quite long for this type 
> of
> component). It is probably possible to replace them with better
> polymeric e-caps, but I chose to buy components as similar as possible
> to the original ones. If you experiment, let me know.
> 
> Replacing those caps is not difficult, but the solder is the classical
> lead-free, high melting point you find on RoHS hardware.
> 
> I you have dead net6501s around, I think it's worth trying. I you are
> not going to try, please send them to me :)
> 
> Good luck!
> 
> Paride
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Thu, 15 Feb 2018 10:37:28 +0100
> From: Denis Fondras <[email protected]>
> To: [email protected]
> Subject: Re: [Soekris] How I fixed a dead net6501 (Red Light Of Death)
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=us-ascii
> 
> Thank you for this information, I will try it :)
> 
> On Thu, Feb 15, 2018 at 10:11:31AM +0100, Paride Legovini wrote:
>> A few months ago I bought myself a bargain net6501 off ebay to be used
>> as home router. It was working flawlessly with OPNsense, but at some
>> point after a reboot it was stuck with the infamous RLOD this list 
>> knows
>> very well. The symptoms were the classical ones for bad capacitors:
>> 
>>  - random failure to reach POST;
>>  - works by retrying several times;
>>  - works after several hours unplugged;
>>  - degenerative problem.
>> 
>> To a visual inspection all the caps appeared in good conditions,
>> nevertheless I bought a full set of caps (the electrolytic ones,
>> included the "solid state" polymer electrolytics).
>> 
>> Yesterday night I began to replace them, starting from the usual
>> suspects: the two 35V 150uF electrolytics between the inductors, near
>> the power connector. After replacing them I tested the board and, 
>> guess
>> what, now it never fails to boot. Fixed!
>> 
>> The capacitance of the two caps I removed is about 155uF, so well 
>> within
>> the specs. They probably dried out and the ESR rose.
>> 
>> This is the exact model I bought:
>> 
>> http://deb.li/DXm1
>> 
>> Note the very long working life (7000 hours, quite long for this type 
>> of
>> component). It is probably possible to replace them with better
>> polymeric e-caps, but I chose to buy components as similar as possible
>> to the original ones. If you experiment, let me know.
>> 
>> Replacing those caps is not difficult, but the solder is the classical
>> lead-free, high melting point you find on RoHS hardware.
>> 
>> I you have dead net6501s around, I think it's worth trying. I you are
>> not going to try, please send them to me :)
>> 
>> Good luck!
>> 
>> Paride
>> _______________________________________________
>> Soekris-tech mailing list
>> [email protected]
>> http://lists.soekris.com/mailman/listinfo/soekris-tech
> 
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> End of Soekris-tech Digest, Vol 161, Issue 1
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