Kitz Forum
Broadband Related => Broadband Hardware => Topic started by: digitalnemesis on September 27, 2020, 08:54:26 AM
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Is my Zyxel VMG8924-B10A faulty because it rebooted automatically twice this week 5 days apart for no apparent reason.
How can I check what is causing the automatic reboots? All remote management is off and it's unbranded so could it be the power supply not giving enough power or the stats overloading it?
Currently on 28-jumbo-tel-x6-stats1.1-cmd
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The PSU can be troublesome with this router as it needs quite a lot of power, you need to check it is the correct PSU it's not the same as the 8324.
Stuart
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Hi this is the power adapter that came with mine:
(https://i.imgur.com/TykYy7N.jpg)
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I seem to remember 2A output is correct, I'll try to dig mine out and check later. If I'm right it is possible you have a duff PSU but there's no easy way to check as you need to test it under load.
Stuart
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I seem to remember 2A output is correct, I'll try to dig mine out and check later. If I'm right it is possible you have a duff PSU but there's no easy way to check as you need to test it under load.
Stuart
Even under load it can be ripple issues that you wont see without a scope.
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My VMG-1312-B10A rebooted unexpectedly tonight as I was listening to a stream. It has been up for ages before in bridge mode but this is the first time I have used it in router mode.
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None of my many ( > 4 ) VMG 1312-B10As has ever rebooted itself, all in modem mode, never tried full router mode. I use our very own Johnson’s firmware (feb 2020 version) (https://github.com/johnson442/custom-zyxel-firmware/releases) - binaries ready-built and sources. Firmware for ZyXEL models available there too.
I agree that a weak power supply brick could well be the problem. One with a higher current rating is a very good thing, but the ZyXEL-supplied brick is fine. Otherwise bad firmware or a defective unit. A short-term current-draw spike can cause a very short D.C. rail down-going spike that isn’t easy to see with a scope unless you ‘zoom in’.
Too much inductance inside the device, in the line going into its guts would mean that when there is a fast current draw demand, the required current isn’t delivered on time, so the unit dies because the voltage drops fast. The required current can (eventually) be delivered, but always too late; it doesn’t rise quickly enough. I have seen this problem with prototype computers at work. So internal resistance and inductance are the two ills.
Burakkucat uses a VMG 1312-B10A in router mode iirc so he will know about reliability.
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Burakkucat uses a VMG 1312-B10A in router mode iirc so he will know about reliability.
My one and only problem occurred a couple of months ago when the switch-mode power supply just died. In the preceding fortnight I experienced two unexplained system re-boot events. On both occasions I was quick enough to see the "all LEDs out" state followed by the usual LED sequence of a system power-on. However, as Weaver has mentioned, I use a VMG1312-B10A and not a VMG8924-B10A.
Perhaps the PSU is "giving hints" that its demise is near? Who knows . . . :-\
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I have swapped out my VMG-1312-B10A and adapter. Whilst at an idle moment I tested the adapter of the rebooting router and it was around 14.2v with a multimeter. This seems about right?
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That’s about right. But as for voltage downward-going spikes, a scope would be needed to catch those as they will be of extremely short duration.
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Hmmm yeah I probably think there's something obtuse occuring with my adapter. I recall noticing something iffy going on with my VOIP adapter when the power supply was on its last legs. I'm not sure how to prove this though without the proper equipment.
Could there be something faulty with the hardware of the router itself though?
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Not likely, but what do I know. Capacitors deteriorate for example. I would just swap out the power supply first for a good one with a strong current rating, as that’s a cheap fix. Depends on what your time is worth to you, but a £10-15 PSU from ebay is so cheap your time diagnosing it would be costly, especially if you need to buy a scope to do it.
I have a mountain of VMG 1312-B10As but I don’t know if all the PSUs are the same for the different models.
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This works fine - https://www.ebay.co.uk/itm/Genuine-BT-Home-Hub-5-Type-B-Power-supply-12V-2A-WILL-NOT-WORK-WITH-TYPE-A/174441136397?epid=1891896714&hash=item289d80810d:g:oJQAAOSwsnldD8P1 - it's what my 8924 has been running happily on for a few years now (must be 'Type B').
:)
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Would Tubaman’s ebay PSU work with a VMG 1312-B10A too? I’m wondering if the power supply requirements are the same across the range? And if they’re not then it’s just a matter of getting a superior unit, provided the connectors and polarity are the same.
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Would Tubaman’s ebay PSU work with a VMG 1312-B10A too?
Yes, it would. I have one, which is kept with my reserve VMG1312-B10A, for a just-in-case event.
See: Now What? (https://forum.kitz.co.uk/index.php/topic,24854.0.html)
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Damn. Tubaman’s ebay man, wretch that he is, does not post to the Highlands (or the Isle of Wight, so it’s stupidity not racism). Grrr. >:( But luckily I found an alternative, sane ebay seller (https://www.ebay.co.uk/itm/12V-Adaptor-Power-Supply-Charger-for-BT-P-N-131502401310J-BT-Home-Hub-5-Type-B-/293699731963) and bought one. £10 and free postage.
I have a lot of VMG 1312-B10As and some of them came from France with annoying European PSUs for which Janet fitted adapters in order to get the PSUs to fit into UK mains sockets. If that ebay purchase turns out to be a good one, then I might swap out all the foreign PSUs and put them into the spares bag.
There is a giant humungous carrier bag in Janet’s office cum dressing room, which is called “Bert’s Barrow” because there is no Bert and it isn’t a wheelbarrow. ??? All loose kit that Janet might lose track of goes in there: eg assorted cables, other small items, and spare modems are in it or near it close by on shelves. The idea is that after constantly losing things, there is nowadays only one place to go to - Bert’s Barrow - and the law is that when anything arrives, it must be placed immediately into Bert’s Barrow and nowhere else, apart from one exception which is being placed on the stairs heading in the upstairs direction waiting until Janet’s next trip upstairs.
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This works fine - https://www.ebay.co.uk/itm/Genuine-BT-Home-Hub-5-Type-B-Power-supply-12V-2A-WILL-NOT-WORK-WITH-TYPE-A/174441136397?epid=1891896714&hash=item289d80810d:g:oJQAAOSwsnldD8P1 - it's what my 8924 has been running happily on for a few years now (must be 'Type B').
:)
Are the cables on those as long as the Type A? Because if there is one thing I love about HH5A is the loooooong PSU cable, its rare to find any PSU with a cable that long.
Come to think of it, I think they are as I believe that is what I'm running the porch LED strip off. ::)
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This works fine - https://www.ebay.co.uk/itm/Genuine-BT-Home-Hub-5-Type-B-Power-supply-12V-2A-WILL-NOT-WORK-WITH-TYPE-A/174441136397?epid=1891896714&hash=item289d80810d:g:oJQAAOSwsnldD8P1 (https://www.ebay.co.uk/itm/Genuine-BT-Home-Hub-5-Type-B-Power-supply-12V-2A-WILL-NOT-WORK-WITH-TYPE-A/174441136397?epid=1891896714&hash=item289d80810d:g:oJQAAOSwsnldD8P1) - it's what my 8924 has been running happily on for a few years now (must be 'Type B').
:)
Nice one cheers.
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Damn. Tubaman’s ebay man, wretch that he is, does not post to the Highlands (or the Isle of Wight, so it’s stupidity not racism). Grrr. >:( But luckily I found an alternative, sane ebay seller (https://www.ebay.co.uk/itm/12V-Adaptor-Power-Supply-Charger-for-BT-P-N-131502401310J-BT-Home-Hub-5-Type-B-/293699731963) and bought one. £10 and free postage.
I have a lot of VMG 1312-B10As and some of them came from France with annoying European PSUs for which Janet fitted adapters in order to get the PSUs to fit into UK mains sockets. If that ebay purchase turns out to be a good one, then I might swap out all the foreign PSUs and put them into the spares bag.
There is a giant humungous carrier bag in Janet’s office cum dressing room, which is called “Bert’s Barrow” because there is no Bert and it isn’t a wheelbarrow. ??? All loose kit that Janet might lose track of goes in there: eg assorted cables, other small items, and spare modems are in it or near it close by on shelves. The idea is that after constantly losing things, there is nowadays only one place to go to - Bert’s Barrow - and the law is that when anything arrives, it must be placed immediately into Bert’s Barrow and nowhere else, apart from one exception which is being placed on the stairs heading in the upstairs direction waiting until Janet’s next trip upstairs.
What's Tubaman's link to the adapter?
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See earlier post https://forum.kitz.co.uk/index.php/topic,25200.msg422911.html#msg422911
Tubaman posted a link to an ebay seller (in the post linked to above) who refuses to ship to many parts of Britain even, fool that the seller is. (Not Tubaman!!) Does that make sense?
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I got another reboot tonight but this was in the log "Out of MDM shared memory need to reboot ". Looks like I will be using the VMG-1312-B10A in bridge mode.
Found https://forum.kitz.co.uk/index.php?topic=15038.45 for the 8924.
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See earlier post https://forum.kitz.co.uk/index.php/topic,25200.msg422911.html#msg422911
Tubaman posted a link to an ebay seller (in the post linked to above) who refuses to ship to many parts of Britain even, fool that the seller is. (Not Tubaman!!) Does that make sense?
When they claim to be using Royal Mail I just don't understand why they won't ship to all of the UK - the price is the same!
The PSU I recommended for burakkucat was actually a Homehub 3 Type A variety, as he was asking for a VMG1312 and not VMG8924. The router end plug is the same however, just that the VMG1312 only needs a 1000mA rated unit rather than the VMG8924's 2000mA
I hope the one you have bought is ok as it's not an OEM part but a generic replacement. I've had mixed luck with such PSUs in the past (in a different application - haven't tried for a router).
:)
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Yes, I thought so from the photo. Taking a chance here, but for £10 I’ll roll the dice.
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I was curious so tested a 12V 1.5A switch mode power supply I found from another router and so far no reboots in around 4 days of uptime/DSL sync! :fingers: :fingers: I don't use the USB ports on the router so I think it should be fine.