2024-12-12, 07:02 AM
Yes, all qfn components were not correctly solder.
I used a hot plate (MHP50 and 30). I placed solder wire (with lead) on all the pads with a small tip iron and flu. It may have better to use solder paste but I didn't have access to it when I mounted the boards. I'm novice with heat plates and temp curves for reflow so I just set it to heat at 250°C. Then I put the pc with the placed components on the plate and waited for solder to melt, helping components to get in with the tip of a thin plier.
Then when I saw that all components were bad, I used the soldering iron and binocular magnifier to add solder wire on the pins and pads.
I think the whole process would have been more successful if :
-I was less excited / doing things fast
-took the time to learn about reflow curves
-I used solder paste instead of wire, but not sure
-I'd put less solder (I was careful not to put too much, but it was still too much) on the big exposed gnd pad, because it seemed that the components were too high to touch the solder on the other pads
Your inputs on these issues are welcome too. I assembled a working one that I'll offer to my partner but will make one for me too and a coworker is mounting one too for himself!
I used a hot plate (MHP50 and 30). I placed solder wire (with lead) on all the pads with a small tip iron and flu. It may have better to use solder paste but I didn't have access to it when I mounted the boards. I'm novice with heat plates and temp curves for reflow so I just set it to heat at 250°C. Then I put the pc with the placed components on the plate and waited for solder to melt, helping components to get in with the tip of a thin plier.
Then when I saw that all components were bad, I used the soldering iron and binocular magnifier to add solder wire on the pins and pads.
I think the whole process would have been more successful if :
-I was less excited / doing things fast
-took the time to learn about reflow curves
-I used solder paste instead of wire, but not sure
-I'd put less solder (I was careful not to put too much, but it was still too much) on the big exposed gnd pad, because it seemed that the components were too high to touch the solder on the other pads
Your inputs on these issues are welcome too. I assembled a working one that I'll offer to my partner but will make one for me too and a coworker is mounting one too for himself!
