Kitz Forum

Broadband Related => Broadband Hardware => Topic started by: banger on February 19, 2021, 10:21:19 PM

Title: Think one of my VMG1312-B10A is failing
Post by: banger on February 19, 2021, 10:21:19 PM: This morning one of my Zyxel VMG-1312-B10A rebooted at 8am after around 14 days uptime in bridge mode. It has been timing out in DSLStats for telnet for quite a while and seems sluggish on the web GUI. So I have replaced it with another 1312A which seems to have cured the problem of telnet timing out. It's a shame because the one I have replaced had the highest sync out of all of them. Think it's on it's way out?
Title: Re: Think one of my VMG1312-B10A is failing
Post by: Alex Atkin UK on February 20, 2021, 05:07:30 AM: Did you try just swapping the PSU?
Title: Re: Think one of my VMG1312-B10A is failing
Post by: banger on February 20, 2021, 06:30:00 AM: Quote from: Alex Atkin UK on February 20, 2021, 05:07:30 AM
Did you try just swapping the PSU?

Swapped both.
Title: Re: Think one of my VMG1312-B10A is failing
Post by: Alex Atkin UK on February 20, 2021, 07:09:08 AM: Quote from: banger on February 20, 2021, 06:30:00 AM
Swapped both.

I mean did you try the PSU from the one you are using now with the old one, to see if its the router or the PSU at fault?
Title: Re: Think one of my VMG1312-B10A is failing
Post by: banger on February 20, 2021, 01:50:04 PM: No just swapped both router and PSU.
Title: Re: Think one of my VMG1312-B10A is failing
Post by: burakkucat on February 20, 2021, 02:37:36 PM: Last June (2020) I experienced a non-operative ZyXEL VMG1312-B10A (https://forum.kitz.co.uk/index.php/topic,24854.msg417966.html). After some tests, the PSU was identified as the culprit.
Title: Re: Think one of my VMG1312-B10A is failing
Post by: banger on February 20, 2021, 07:13:12 PM: I think I remeber that thread mr B*Kat. I shall have to dig out a multimeter and test when I get time. I have put both back in original box and marked with a red dot.
Title: Re: Think one of my VMG1312-B10A is failing
Post by: Alex Atkin UK on February 20, 2021, 08:20:08 PM: A multimeter isn't really going to tell you much as a bad PSU usually will output the right voltage under no load, potentially even under load, but the ripple will be all over the place which is what causes stability problems.

As always, its usually the electrolytic capacitors that have dried up.
Title: Re: Think one of my VMG1312-B10A is failing
Post by: banger on February 20, 2021, 08:32:01 PM: Well my 1960's oscilliscope is in the loft and its a mess up there. :lol:

Quote
As always, its usually the electrolytic capacitors that have dried up.

In the PSU or 1312?
Title: Re: Think one of my VMG1312-B10A is failing
Post by: Alex Atkin UK on February 20, 2021, 11:55:16 PM: Quote from: banger on February 20, 2021, 08:32:01 PM
Well my 1960's oscilliscope is in the loft and its a mess up there. :lol:

In the PSU or 1312?

Both, but I don't see any in the 1312 that seem likely candidates vs the PSU where its usually impossible to replace them.
Title: Re: Think one of my VMG1312-B10A is failing
Post by: burakkucat on February 21, 2021, 12:35:56 AM: In my case (https://forum.kitz.co.uk/index.php/topic,24854.msg417966.html), it was the PSU that had failed. I.e. zero volts DC output. Hence an easy test and thus an easy solution.