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.
Solder is a low melting point metal used to join two metals, 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 proper 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 the 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, and to heat the pads/component leads too
Then with my shitty ass soldering iron and skills I overheat the surrounding components while attempting to bring the soldering spot to temperature...
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.
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.
Get some cheap magnifying glasses with a light.
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 could explain it.
e: especially since they’re all at the bottom half of the board. That was closest to the heating element, right?
That'd be about right. There's insulation inbetween.
Unlikely any heat from the slow cooker did anything. Solder melts at 370F. A slow cooker is never going to get anywhere close to that hot.
Strange that all the bad points are in the lower half of the board, and that most points in that half are bad, then.
e: could a malfunction make it heat beyond 370f?
It's most likely that it's related to the original manufacturing. These will be machine wave-soldered, not hand soldered, and having quality vary across the board isn't impossible if the setup/operators were less than ideal.
Perhaps. It still seems odd to me that this board was mounted vertically inline with the heating element and the bad parts I identified line up with that, before I knew that was the case:
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
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...
!remindme 24h
I count 5 cold solders
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.
I didn't even see those. Thanks. I got the one on the left side strip, but the LED display is still missing segments.
Unfortunately my eyes aren’t what they used to be, so i might have to take the board in to get the others.
Far left 5th down also appears to not be soldered at all
I got the one on the left side strip
The two in the bottom left are a bit questionable as well.
I feel like I still missed a few. Why was this board disrespected so badly? Is it a student learning board?
Control panel from a slow cooker.
Well I see the 5th pin from the top on the far left looks like it's missing solder. The rest of the board is extremely dirty and hard to tell.
Thats the one I saw. Someone pointed some others but my eyes aren’t what they used to be.
all cold joints aside, the vintage microcontroller looking thing on the left looks like it has a missing solder joint
If you wait several minutes they should all have cooled off.
!/s!<
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.
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.
What about the not soldered pins game?
Left 5th from the top.
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.
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.
Is there a "lostlemmings" community?
I'm sure this was (mildly) infuriating but it's not relatable to 99.8% of people
I feel like people on Lemmy skew substantially towards the tech-aware
I know about soldering, a bit, soldered stuff quite many times, but I still have no idea what I should be looking for.
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