> On 2/8/22 17:06, Sylvia Else wrote:
>> On 02-Aug-22 4:01 pm, John Robertson wrote:
>>> On 2022/08/01 10:34 p.m., Sylvia Else wrote:
>>>> So I opened it up.
>>>>
>>>> https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
>>>>
>>>> Seems fairly clear what the problem is.
>>>>
>>>> By why would the crystal fall off the board like that?
>>>>
>>>> Sylvia.
>>>
>>> This sort of item should also be secured to the PCB with glue.
>>> Easy to resolder if you have some lead-free solder (I assume).
>>> John :-#)#
>>
>> Glue wouldn't hurt.
>>
>> But if anything was going to fall off, I'd have thought it would be the
>> tactile switches.
>
> I've seen something like this. I think the crystal has the highest
> thermal mass (or lowest thermal resistance on its legs) of any SMD part
> on the board (the battery tabs are through-hole) and the solder reflow
> wasn't quite hot enough for long enough, so it got glued down by melted
> flux not melted solder, or the solder remained only sintered so it was weak.
Correct. This is a common problem with larger parts, like coin cell
holders etc. They need more time to heat up so you don't get a cold joint.
I had a digital clock made by a PCB assembler that I got for free at some
trade show. Something fell off and I told them about it at the next show I
ran into them at and they actually offered to RMA and repair it for me as
they were embarassed about it.
Reply by Martin Rid●August 3, 20222022-08-03
Sylvia Else <sylvia@email.invalid> Wrote in message:r
> On 02-Aug-22 3:34 pm, Sylvia Else wrote:> So I opened it up.> > https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0> > Seems fairly clear what the problem is.> > By why would the crystal fall off the board like that?> > Sylvia.OK, I've soldered it back, and it works. It remains to be seen whether my soldering is better than the original.The most difficult aspect was getting it back into its enclosure, which seemed to be designed for assembly in zero-g, by someone with five hands, or something.Sylvia.
On Tuesday, August 2, 2022 at 10:42:15 PM UTC-4, Sylvia Else wrote:
> On 02-Aug-22 3:34 pm, Sylvia Else wrote:
> > So I opened it up.
> >
> > https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
> >
> > Seems fairly clear what the problem is.
> >
> > By why would the crystal fall off the board like that?
> >
> > Sylvia.
> OK, I've soldered it back, and it works. It remains to be seen whether
> my soldering is better than the original.
>
> The most difficult aspect was getting it back into its enclosure, which
> seemed to be designed for assembly in zero-g, by someone with five
> hands, or something.
That's where they get the lowest labor rates.
--
Rick C.
++ Get 1,000 miles of free Supercharging
++ Tesla referral code - https://ts.la/richard11209
Reply by Ricky●August 3, 20222022-08-03
On Tuesday, August 2, 2022 at 9:53:29 PM UTC-4, Phil Hobbs wrote:
> Sylvia Else wrote:
> > On 02-Aug-22 10:32 pm, Phil Hobbs wrote:
> >> Sylvia Else wrote:
> >>> So I opened it up.
> >>>
> >>> https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
> >>>
> >>> Seems fairly clear what the problem is.
> >>>
> >>> By why would the crystal fall off the board like that?
> >>>
> >>> Sylvia.
> >>
> >> Looks like it might have got whacked by the battery when you dropped
> >> it on the floor.
> >>
> >> Cheers
> >>
> >> Phil Hobbs
> >>
> >
> > Probably not. The image is a bit misleading. When the board is in the
> > case, the battery is constrained to be more central in its circuit board
> > slot, and cannot touch the crystal.
> >
> > Sylvia.
> If you say so. Per the picture, the metal shroud on the negative
> terminal wraps around the wrong side, leaving only the spring to keep
> the battery from hitting the crystal on impact.
You aren't looking at the case!
--
Rick C.
+- Get 1,000 miles of free Supercharging
+- Tesla referral code - https://ts.la/richard11209
OK, I've soldered it back, and it works. It remains to be seen whether
my soldering is better than the original.
The most difficult aspect was getting it back into its enclosure, which
seemed to be designed for assembly in zero-g, by someone with five
hands, or something.
Sylvia.
Reply by Beeper●August 2, 20222022-08-02
On 8/2/2022 6:53 PM, Phil Hobbs wrote:
> Sylvia Else wrote:
>> On 02-Aug-22 10:32 pm, Phil Hobbs wrote:
>>> Sylvia Else wrote:
>>>> So I opened it up.
>>>>
>>>> https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
>>>>
>>>> Seems fairly clear what the problem is.
>>>>
>>>> By why would the crystal fall off the board like that?
>>>>
>>>> Sylvia.
>>>
>>> Looks like it might have got whacked by the battery when you dropped
>>> it on the floor.
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>>>
>>
>> Probably not. The image is a bit misleading. When the board is in the
>> case, the battery is constrained to be more central in its circuit
>> board slot, and cannot touch the crystal.
>>
>> Sylvia.
>
> If you say so. Per the picture, the metal shroud on the negative
> terminal wraps around the wrong side, leaving only the spring to keep
> the battery from hitting the crystal on impact.
I suspect that the PCBA is housed in a plastic clam-shell case that may
very well have interior molded ribs designed to restrict movement of the
battery when the remote is fully assembled.
> However, assuming the crystal survived, the fix is pretty obvious. ;)
>
> Cheers
>
> Phil Hobbs
>
>
> --
> Dr Philip C D Hobbs
> Principal Consultant
> ElectroOptical Innovations LLC / Hobbs ElectroOptics
> Optics, Electro-optics, Photonics, Analog Electronics
> Briarcliff Manor NY 10510
>
> http://electrooptical.net
> http://hobbs-eo.com
>
Reply by Phil Hobbs●August 2, 20222022-08-02
Sylvia Else wrote:
> On 02-Aug-22 10:32 pm, Phil Hobbs wrote:
>> Sylvia Else wrote:
>>> So I opened it up.
>>>
>>> https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
>>>
>>> Seems fairly clear what the problem is.
>>>
>>> By why would the crystal fall off the board like that?
>>>
>>> Sylvia.
>>
>> Looks like it might have got whacked by the battery when you dropped
>> it on the floor.
>>
>> Cheers
>>
>> Phil Hobbs
>>
>
> Probably not. The image is a bit misleading. When the board is in the
> case, the battery is constrained to be more central in its circuit board
> slot, and cannot touch the crystal.
>
> Sylvia.
If you say so. Per the picture, the metal shroud on the negative
terminal wraps around the wrong side, leaving only the spring to keep
the battery from hitting the crystal on impact.
However, assuming the crystal survived, the fix is pretty obvious. ;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510
http://electrooptical.nethttp://hobbs-eo.com
Reply by Sylvia Else●August 2, 20222022-08-02
On 02-Aug-22 10:32 pm, Phil Hobbs wrote:
> Sylvia Else wrote:
>> So I opened it up.
>>
>> https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
>>
>> Seems fairly clear what the problem is.
>>
>> By why would the crystal fall off the board like that?
>>
>> Sylvia.
>
> Looks like it might have got whacked by the battery when you dropped it
> on the floor.
>
> Cheers
>
> Phil Hobbs
>
Probably not. The image is a bit misleading. When the board is in the
case, the battery is constrained to be more central in its circuit board
slot, and cannot touch the crystal.
Sylvia.
Reply by Clifford Heath●August 2, 20222022-08-02
On 2/8/22 23:32, Fred Bloggs wrote:
> On Tuesday, August 2, 2022 at 6:39:30 AM UTC-4, Clifford Heath wrote:
>> On 2/8/22 17:06, Sylvia Else wrote:
>>> On 02-Aug-22 4:01 pm, John Robertson wrote:
>>>> On 2022/08/01 10:34 p.m., Sylvia Else wrote:
>>>>> So I opened it up.
>>>>>
>>>>> https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
>>>>>
>>>>> Seems fairly clear what the problem is.
>>>>>
>>>>> By why would the crystal fall off the board like that?
>>>>>
>>>>> Sylvia.
>>>>
>>>> This sort of item should also be secured to the PCB with glue.
>>>> Easy to resolder if you have some lead-free solder (I assume).
>>>> John :-#)#
>>>
>>> Glue wouldn't hurt.
>>>
>>> But if anything was going to fall off, I'd have thought it would be the
>>> tactile switches.
>> I've seen something like this. I think the crystal has the highest
>> thermal mass (or lowest thermal resistance on its legs) of any SMD part
>> on the board (the battery tabs are through-hole) and the solder reflow
>> wasn't quite hot enough for long enough, so it got glued down by melted
>> flux not melted solder, or the solder remained only sintered so it was weak.
>>
>> CH
>
> That's close but you would think they have all that ironed out after making gazzillions of fobs...
99% of them are probably fine. This one was in the cold corner of the
tray, on a day when all the local a/c units were pulling down the line
voltage, or some similar thing. Only have to get 90% to pass the
warranty period - you won't even hear about the 10% because it's less
hassle to replace the fob than to complain.
Clifford Heath
Reply by John Walliker●August 2, 20222022-08-02
On Tuesday, 2 August 2022 at 18:07:03 UTC+1, DecadentLinux...@decadence.org wrote:
> Joe Gwinn <joeg...@comcast.net> wrote in
> news:06hiehdr516bfhjg5...@4ax.com:
> > On Tue, 2 Aug 2022 08:32:45 -0400, Phil Hobbs
> > <pcdhSpamM...@electrooptical.net> wrote:
> >
> >>Sylvia Else wrote:
> >>> So I opened it up.
> >>>
> >>> https://www.dropbox.com/s/4qb9x10tnczm3x8/remote.jpg?dl=0
> >>>
> >>> Seems fairly clear what the problem is.
> >>>
> >>> By why would the crystal fall off the board like that?
> >>>
> >>> Sylvia.
> >>
> >>Looks like it might have got whacked by the battery when you
> >>dropped it on the floor.
> >
> > That would be my guess as well.
> >
> > Joe Gwinn
> >
> The battery looks like it would do it again as well. So it too need
> to fixturing like two 3 or 4mm holes at the free end near the crystal
> and a tiny tie wrap. Or a drop of holt melt small enough to be able
> to be sliced free for replacement.
The crystal can looks like it has glass-to-metal seals which will
probably be made of Covar which needs to be plated to make it
solderable. As suggested earlier, poor adhesion of the plating
would give a weak joint. As it is a relatively large component there
will probably have been considerable stress due to shrinkage of the
pcb material during cooling after reflow. A mechanical
shock from dropping the remote would make it ping off.
John