When soldering WATCH THE SOLDER!!
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It¡¯s not about touching the iron to the joint /shovelling a blob onto the board / holding the iron on a wire. ? ? All of there can result in poor joints, bridges, non-joints ?etc?
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The iron is there to heat the joint surfaces not shovel solder. ?(Start with the ¡®biggest¡¯ area then roll onto the other bits too then feed solder into the biggest area then WATCH closely? to confirm everywhere gets soldered.
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Without ?offending the environmentalists I will say that leaded solder with mildly active flux makes this very very easy compared to lead free?
Invest in a syringe of no clean flux for extra help on tricky /untidy areas?
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Watching closely (at least at my age) is best done with an illuminated magnifier and a small loupe for minute inspections of usb pin areas
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It¡¯s easier to spot problems at this point than afterwards ¡?
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Double check most pedantically the identity and placement of every component and triple check anything that will be a challenge to remove.
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On assembly watch out for tall/ large wires and components touching as it all goes together. ?
Bruce Akhurst