I count 5 cold solders
Let's play Spot the Cold Solder.
Submitted 11 months ago by lazylion_ca@lemmy.ca to mildlyinfuriating@lemmy.world
https://lemmy.ca/pictrs/image/43d07529-8b5d-4ff4-8c2b-fe10ab7da562.jpeg
Comments
robotopera@sh.itjust.works 11 months ago
BunnyKnuckles@startrek.website 11 months ago
Those are the ones I would attack too. I’d also like to send a shout out to the 5 corroded ones on the right.
lazylion_ca@lemmy.ca 11 months ago
I didn’t even see those. Thanks. I got the one on the left side strip, but the LED display is still missing elements.
Unfortunately my eyes aren’t what they used to be, so i might have to take the board in to get the others.
A7thStone@lemmy.world 11 months ago
The two in the bottom left are a bit questionable as well.
LillyPip@lemmy.ca 11 months ago
I feel like I still missed a few. Why was this board disrespected so badly? Is it a student learning board?
lazylion_ca@lemmy.ca 11 months ago
Control panel from a slow cooker.
lemmyman@lemmy.world 11 months ago
Is there a “lostlemmings” community?
I’m sure this was (mildly) infuriating but it’s not relatable to 99.8% of people
caseyweederman@lemmy.ca 11 months ago
I feel like people on Lemmy skew substantially towards the tech-aware
WindowsEnjoyer@sh.itjust.works 11 months ago
I know about soldering, a bit, soldered stuff quite many times, but I still have no idea what I should be looking for.
geekworking@lemmy.world 11 months ago
Use a tool to push sideways on the joints and from the component side.
Bad looking joints can still have a connection even if they look bad. If the connection has truly come loose, there will be some movement in the joint.
When we were working on surface mount boards, we would use a sewing needle and run it down the pins, and listen to the sound. The needle crossing a solid pin will make a sharp sound. If solder joint is not good, the pin moves, and you will get a duller sound. Dink, dink, dink, dut.
Albbi@lemmy.ca 11 months ago
Thank you so much for this post. I learned a lot including how to spot some trouble areas on a board, and that they can potentially be fixed.
caseyweederman@lemmy.ca 11 months ago
If you wait several minutes they should all have cooled off.
!/s!<
mariusafa@lemmy.sdf.org 11 months ago
What about the not soldered pins game?
geekworking@lemmy.world 11 months ago
Not sure if just glare, but a lot of these look like one side has too little solder like you didn’t use enough and/or it wasn’t flowing correctly.
lazylion_ca@lemmy.ca 11 months ago
In theory. It’s mounted vertically inside a slow cooker, so over ten years of heating and cooling the solder might have flowed, but I suspect its just typical mass production.
entropicdrift@lemmy.sdf.org 11 months ago
Care to elaborate, for those not as experienced as soldering? This isn’t the most relatable post without some additional context.
For instance, my only experience soldering is with audio equipment (think wires and potentiometers), never with PCBs and I have no clue what you mean.
jjagaimo@lemmy.ca 11 months ago
Solder is a low melting point metal used to join two metals to create a joint, where the solder fills the gap and bonds to both metals. This is commonly used in electronics to bond components to the board. For a good solder joint, the solder must be brought up to the peoper temperature, and the pads on the PCB (metal 1) and leads of the component (metal 2) need to be heated enough. Additionally, flux is added to the solder to remove oxides on the component leads and PCB pads to allow the solder to bond to the metal; oxides can prevent toe solder from sticking.
A cold solder joint is one that does not reach the proper temperature and/or does not have enough flux, leading to the solder not bonding to the joint, having a scaly/bubbly/matte appearance, and a weaker more brittle joint. Flux also doesnt do as good a job at lower temperatures so it’s important for the joint to get hot enough.
XEAL@lemm.ee 11 months ago
Then with my shitty ass soldering iron and skills I overheat the surrounding components while attempting to bring the soldering spot to temperature…
lazylion_ca@lemmy.ca 11 months ago
This is a circuit board from my slow cooker. It quit heating a week ago so I opened it up and found a broken wire. That was easily fixed.
I figured while I had it apart I should look at the display board and see if I can fix the missing segments. I resoldered the one pin but nothing changed.
Unfortunately my eyes arent what they used to be so the others someone pointed out will be a challenge.
chaogomu@kbin.social 11 months ago
5th pin down on the far left side in the picture.
There's no solder on the pin.
Most of the joints are questionable, that one is flat out bad.
pearsaltchocolatebar@discuss.online 11 months ago
Get some cheap magnifying glasses with a light.
LillyPip@lemmy.ca 11 months ago
Oh, that makes more sense. The heat from the malfunctioning cooker may have resoldered these points badly.
I was curious how like half the points were bad, and that explains it.
IcedCoffeeBitch@lemmy.world 11 months ago
Cold solder is what happens when the solder didn’t quite reach the temperature needed to completely melt and do contact, so it looks brittle and would be potentially a faulty connection.
With that said I couldn’t spot it in the pic
chaogomu@kbin.social 11 months ago
There are a bunch of questionable solder joints.
Like half the pins.
But the absolute worst is the 5th pin down on the far left side. There's so little solder used that you can see into the hole.
A few others are also a bit lacking as well. Almost all of the joints are ugly as sin...
anonymouse@sh.itjust.works 11 months ago
!remindme 24h