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My approach to board-level soldering flipped completely after a repair job in 2022
I used to rely on my old Weller station and a ton of flux for every single SMD component, thinking a bigger iron tip was always better. Then I had to fix a water-damaged iPad logic board where the tiny caps were just dissolving. I switched to a cheap hot air station I got for $80 and a much finer tip, and my success rate on those micro joints went from maybe 60% to near perfect. It felt like learning the whole skill over again. Has anyone else made a major switch in their basic soldering technique that paid off big?
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davis.ivan1mo ago
Read a forum post where someone swore by using a lower temperature than you'd think for lead-free solder, like 315C instead of 350C. They said it stopped them from burning up pads on modern boards, which made me try it on a Nintendo Switch chip repair. Slower heat up, but the pad stayed perfect and the joint looked way better under the microscope.
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gonzalez.rowan1mo ago
Wait, 315C? That's way lower than I've ever dared to go. I always figured you needed at least 340 to get decent flow with lead-free. I'm shocked it even worked, but your result with the Switch pad is hard to argue with. Might have to try that next time I'm on a thin board.
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wendy_carr1mo ago
Wait, that actually makes a ton of sense now that I think about it. @davis.ivan I used to be one of those people who cranked it up to 350C because I thought lead-free needed all that heat to flow right. But after wrecking a few pads on an old Xbox One HDMI repair, I finally tried 315C and realized the slower heat soak keeps the board from cooking. The joint still looks clean under a loupe and I didn't have to redo any bridges. Makes me wonder how many boards I've messed up for nothing lol.
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