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.
I wondered why my garage remote didn't work.
Started by ●August 2, 2022
Reply by ●August 2, 20222022-08-02
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 :-#)#
Reply by ●August 2, 20222022-08-02
tirsdag den 2. august 2022 kl. 08.01.31 UTC+2 skrev John Robertson:> 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).leaded solder is fine (and easier) for rework
Reply by ●August 2, 20222022-08-02
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. Sylvia.
Reply by ●August 2, 20222022-08-02
On 02/08/2022 08:06, 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. > > Sylvia.Maybe the switches are supported at the top by a membrane or buttons? Is it possibly the battery could move enough to touch the Xtal? -- Cheers Clive
Reply by ●August 2, 20222022-08-02
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
Reply by ●August 2, 20222022-08-02
On Tuesday, August 2, 2022 at 3:06:19 AM UTC-4, 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.No reason for the switches to fall off. They are always being pressed ONTO the board. The crystal solder probably was cracked when it was dropped at one point, but it kept working until both joints failed. -- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209
Reply by ●August 2, 20222022-08-02
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 -- 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 ●August 2, 20222022-08-02
On Tue, 2 Aug 2022 15:34:00 +1000, Sylvia Else <sylvia@email.invalid> 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.Probably knocked around during battery replacement. RL
Reply by ●August 2, 20222022-08-02
On Tuesday, August 2, 2022 at 7:33:58 AM UTC+2, 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.The pads on the PCB look dull. As Clifford suggested, maybe the soldering was poor - at least on the crystal. The other joints are bright and look good.
