topic Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400 in Network Security

Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Tue, 12 Mar 2019 09:42:48 GMT

Hello!

We have many devices affected by the clock-signal issues.

Cisco does replace the units with repaired/fixed ones.

I have received some ISR4321 routers with the fix applied (pictures attached).

The Cisco provided fix is of - well - mediocre quality (loose solder joints etc..) but works.

I am an EE engineer and am able to fix other routers of my customers as well (attached a picture of one of my fixes).

Spot the difference 🙂

Is there anyone which has received fixed ASA5506, ASA5508 and ISR4331 routers?

Please post pictures of your fix (hi-res if possible)

I ask because I would like to fix them as well (some of my customers) and avoid configuration, license etc. migration.

I am aware that I might void Ciscos warranty by this act of evil 🙂

Best regards,

Bernhard

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Thu, 07 Sep 2017 12:38:05 GMT

Nobody with a repaired ISR4331?

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Fri, 06 Oct 2017 06:02:39 GMT

@cisco QA

Please check your repair process!

Yesterday I received a repaired RMA unit and guess what:

Loose wire (cold solder joint) on your fix which makes it - yes - inactive.

Router will breakdown within month/weeks due to clock-signal-issue.

Is tihs what you want to do?

Is this Cisco quality?

Guess not...

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

William76280 — Mon, 13 Nov 2017 09:16:46 GMT

Hi Benhardt, nice hi-res pics 😉

Thanks for the info, since I plan to purchase one a day off eBay (not for production purposes, of course, but for lab and training - I have to train myself on IOS XR).

BTW, very bad soldering on Cisco's fix, but I think that repair center are more targeted on production volume than in quality - I had a long ago an Asus mobo repaired by one of their centers, it was easy to find that they replaced an SOT23 transistor ... 😕

So, you added a 110R resistor as per EIA-96 marking on 0603 (?) case. Quick question though: on Cisco's fix, they removed R4 (named R4_CLK, 2R2) but you let it in place on you fix. Did you forget to remove it, or is it normal?

Thanks for your answer!

Have a nice day.

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Mon, 13 Nov 2017 09:33:13 GMT

R4_CLK is still present on both models.

It's just the bit blurry picture which makes it hard to identify the component.

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

William76280 — Mon, 13 Nov 2017 09:48:11 GMT

Thanks for the info. I would have bet to see a via under R4 (upper side of the picture) and rosin (resin) on the opposite side.

Have a nice day.

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Chal — Mon, 22 Jan 2018 14:50:13 GMT

Has anyone received a repaired 5506 yet?

Would also be very interested how cisco fixes it.

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Beau Clark — Mon, 05 Mar 2018 21:31:04 GMT

First, Awesome post!

That having been said, is the fix simply soldering 2 wires onto a motherboard? I have some 4331 and 4351 routers that are affected, according to the serial number check page:

http://serialnumbervalidation.com/64253/cgi-bin/index.cgi

Should I pop them open and solder a couple wires inside? Is the fix for the 4331 and 4351 exactly the same? Do you have any more pictures you could share?

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Tue, 06 Mar 2018 04:39:28 GMT

Thank you!

The fix consists in adding a resistor to the mainboard - yes.

But is is not as simple as the solder pads are very small and any error in soldering or with missing ESD countermeasures will probably cause the device to die.

Having said that, please find attached a picture of 4331 router fix.

The resistor is 150 Ohms with 1% tolerance.

Is is located on the bottom side of the board.

You will have to disassemble almost the complete router.

The quality of that original Cisco fix is MUCH better, their staff seem to get some practice

I have not yet had a fixed 4351 on my bench for documentation 🙂

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Beau Clark — Tue, 06 Mar 2018 14:08:35 GMT

I have 2 - 4331 routers, that "are affected", that have been in service for 2.5 years without issue. Would you recommend fixing them before they fail, or leaving them in service and see IF they fail?

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Tue, 06 Mar 2018 14:18:40 GMT

If they are "affected" they will break at any time, maybe soon, maybe later.

It may happen that the degradation inside the CPU is already severe and fixing will not avoid it to fail.

If the routers are not covered with SmartNet and not eligible for Clock-Signal Replacement, I would definitely try a fix.

Don't forget to make a backup of your licenses (UDI S/N)

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

kskksaa — Fri, 09 Mar 2018 15:05:37 GMT

Hello!

I really need this for asa 5506-X

Does anyone already fixed this on asa?

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

fashour — Fri, 16 Mar 2018 18:10:06 GMT

Does anyone have pictures and procedures of a fixed 5506X? I would really appreciate it. I have a lab asa that just died...

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

paulgrehan — Wed, 11 Apr 2018 22:30:48 GMT

Thanks for the image - let us know if you come across a 4351 RMA 🙂

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Thu, 12 Apr 2018 03:41:49 GMT

ISR4351 and ASA5506 are still on my list. No RMA received yet.

I do not want to know Ciscos backlog.... must be huge

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Thu, 24 May 2018 11:40:30 GMT

Here is what all of you have been waiting for:

Pictures of repaired ASA5506

Resistor is 150 Ohms, 0604 or 0402 SMD case.

Attached you can find an overview (spot the fix) and two microscopic (43x magnification) pictures, one of them at an angle to better see the solder joints.

That fix looks reasonable, much flux residue on the bottom but quite well done.

I will resolder them anyways and put eventually some liquid soldermask to protect the fix.

Feedback welcome 🙂

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Thu, 24 May 2018 11:45:17 GMT

Note:

That fix is one of the easiest but you need some magnification to do it well.
On a scale from 1 (hard) to 10 (easy), ASA5506 repair scores a personal 7.

ISR4321: 6
ISR4331: 5 (many screws, big board)
ASA5508 & AA5506 (actually the same board): 3 small and fragile pads

As always practice good ESD protection, care and apply thermal paste when putting all together.

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

agent1533 — Mon, 29 Oct 2018 01:04:32 GMT

Bernhard,

Is the middle resistor actually pulled? I can't tell from the photos you posted.

Thanks!

Paul

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Mon, 29 Oct 2018 07:24:29 GMT

Hello Paul,

to which pictures are you referring to?

Cheers,

Bernhard

Re: Clock-Signal Repair Pictures ISR4300, ASA, ISR4400

Bernhard Roth — Mon, 29 Oct 2018 08:05:35 GMT

According to my findings, no components need to be "pulled" or removed.

All devices have only a resistor added (different values depending on model).