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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 <p...@ninthfloor.org>
To: soekris-tech@lists.soekris.com
Subject: [Soekris] How I fixed a dead net6501 (Red Light Of Death)
Message-ID: <3ae5791b-651d-6c12-abbb-c84204320...@ninthfloor.org>
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 <soek...@ledeuns.net>
To: soekris-tech@lists.soekris.com
Subject: Re: [Soekris] How I fixed a dead net6501 (Red Light Of Death)
Message-ID: <20180215093728.gr80...@carcass.ledeuns.net>
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
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End of Soekris-tech Digest, Vol 161, Issue 1
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