[time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Philip Gladstone]

Are you heating the underside of the board with the hot air or the module
side? I was thinking that I'd try heating the underside of the board with
high temp hot air and then try to gently pry the module off. This probably
only requires three hands, so I should be good!

Philip

On Mon, Jan 11, 2021 at 12:57 PM Clint Jay <cjaysharp at gmail.com> wrote:

> Do they have a ground pad on the underneath of them which solders to the
> board?
>
> If not then I'd suggest methodically working your way round them with
> solder wick, removing as much solder as you can before slipping the tip of
> a fine blade under a corner to apply the slightest leverage, you then work
> your way round the 'mousebites' again until you can see them separate from
> the board.
>
> I've recovered other, larger, older U-Blox modules that way.
>
> Alternatively add low melting point solder, wick it away, repeat the
> process until the 'standard' solder is diluted enough that a bit of heat
> from a hot air tool to the underside of the board allows you to lift the
> module off.
>
> On Mon, 11 Jan 2021 at 17:17, Bob kb8tq <kb8tq at n1k.org> wrote:
>
> > Hi
> >
> > Pulling those modules off a multi-layer board is an art. Some seem to be
> > able
> > to do it, others not so much. Applying a *lot* of heat (like with a torch
> > !!!) seems
> > to be one way to do it. Since the module is soldered internally, it is
> > tricky. That’s
> > why the “assemblies” at roughly the same price caught my attention.
> >
> > Bob
> >
> > > On Jan 11, 2021, at 9:53 AM, paul swed <paulswedb at gmail.com> wrote:
> > >
> > > With respect to the cut boards they are about 5 layers and some of the
> > > layers are shorted by the cut. Perhaps sanding them down would allow
> the
> > > boards to be used directly. My luck at popping the module off the board
> > has
> > > not been very successful so far.
> > > Regards
> > > Paul
> > >
> > > On Sun, Jan 10, 2021 at 10:03 PM Bob kb8tq <kb8tq at n1k.org> wrote:
> > >
> > >> Hi
> > >>
> > >> There appear to be a lot of the cut off boards. The assemblies may
> well
> > be
> > >> usable “as is”. It’s too bad there aren’t more of them. At the price,
> > they
> > >> are
> > >> (used to be) an attractive alternative.
> > >>
> > >> Bob
> > >>
> > >>> On Jan 10, 2021, at 8:41 PM, Didier Juges <shalimr9 at gmail.com>
> wrote:
> > >>>
> > >>> ebay seller Queen's Land sent me this picture of the back of the cut
> > off
> > >>> board. Apparently they still have a bunch.
> > >>> https://www.ebay.com/usr/queen*s_land?ul_noapp=true
> > >>>
> > >>> Didier KO4BB
> > >>>
> > >>> On Sun, Jan 10, 2021 at 3:47 PM Bob kb8tq <kb8tq at n1k.org> wrote:
> > >>>
> > >>>> HI
> > >>>>
> > >>>> Looking a bit more closely at the remains of the “chopped up” boards
> > >> with
> > >>>> the M8T’s on them …
> > >>>> This board is *not* the source of those devices. What’s left of the
> > >>>> marking on those boards
> > >>>> does not line up with what’s on these (now sold out) boards.
> > >>>>
> > >>>> There seems to be at least one switching regulator on this board, a
> > CPU
> > >>>> (with JTAG programming
> > >>>> connector ??),  and a fairly elaborate antenna bias / protection
> > >> circuit.
> > >>>> No idea what might be on the
> > >>>> back of the board.
> > >>>>
> > >>>> With any luck, they will get more of these in stock.
> > >>>>
> > >>>> Bob
> > >>>>
> > >>>>> On Jan 9, 2021, at 10:20 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
> > >>>>>
> > >>>>> Hi
> > >>>>>
> > >>>>> Just for the sake of listing all the variations:
> > >>>>>
> > >>>>>
> > >>>>
> > >>
> >
> https://www.ebay.com/itm/ON-SALE-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-Timing-Module-Board/333778776570?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
> > >>>> <
> > >>>>
> > >>
> >
> https://www.ebay.com/itm/ON-SALE-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-Timing-Module-Board/333778776570?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
> > >>>>>
> > >>>>>
> > >>>>> Is the M8T on what I would *guess* is the original board. Simply
> from
> > >>>> looking at the picture I think
> > >>>>> you can guess pretty well what’s what on the board.
> > >>>>>
> > >>>>> Hint: If you buy quite a few …. errr … 10 … there s a pretty good
> > >> chance
> > >>>> that something more than
> > >>>>> 20% might get knocked off the price …. I bought a pretty large pile
> > of
> > >>>> stuff so it’s not clear if that
> > >>>>> had some impact on what offers got accepted …..
> > >>>>>
> > >>>>> If that’s not your favorite RF connector on the board, there are
> > SMA’s
> > >>>> that likely fit in the same footprint.
> > >>>>>
> > >>>>> Bob
> > >>>>>
> > >>>>>> On Jan 9, 2021, at 6:41 PM, Nigel gm8pzr via time-nuts <
> > >>>> time-nuts at lists.febo.com <mailto:time-nuts at lists.febo.com>> wrote:
> > >>>>>>
> > >>>>>> Hmmmm
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>> was kinda thinking that might be the case, perhaps time to hope
> they
> > >>>> weren't tested after all!
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>> Late here, will check tomorrow
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>> Nigel GM8PZR
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>> Hi
> > >>>>>>
> > >>>>>> The “normal chips” that should be inside the module all have
> > something
> > >>>> like a 3.6V max supply rating on them.
> > >>>>>>
> > >>>>>> I would guess that 5V will melt a goodly number of them.
> > >>>>>>
> > >>>>>> Bob
> > >>>>>>
> > >>>>>> _______________________________________________
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> > >>>>
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> > >>>>
> > >>> <M8T.jpg>_______________________________________________
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> > >>
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>
>
> --
> Clint. M0UAW IO83
>
> *No trees were harmed in the sending of this mail. However, a large number
> of electrons were greatly inconvenienced.*
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