USB connector repair

步骤 1 Find out which cable goes to which connector

USB connector repair, Find out which cable goes to which connector: 步骤 1 中的图像 1，1

before separating the parts pay attention to the colours of the wires, which ones goes to which connector. Always a good idea to take a picture. On this apple USB cable (30-pin first generation to USB) it goes, left ro right, black,white,green,red.

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步骤 2 Preparing the wires for soldering

USB connector repair, Preparing the wires for soldering: 步骤 2 中的图像 1，2

USB connector repair, Preparing the wires for soldering: 步骤 2 中的图像 2，2

Cut the wires to expose enough coper to be able to solder them to the connectors. Try to get all four to the same length.

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步骤 3 Solder the wires to the connectors

USB connector repair, Solder the wires to the connectors: 步骤 3 中的图像 1，3

USB connector repair, Solder the wires to the connectors: 步骤 3 中的图像 2，3

USB connector repair, Solder the wires to the connectors: 步骤 3 中的图像 3，3

Proceed with the soldering. Very likely just heating up the solder that was in the connector will be enough to push the wire when is melted. Otherwise, just add a tiny bit more of solder on top.
A pair of soldering helping hands is very useful for this kind of soldering.

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步骤 4 Check for shorts

USB connector repair, Check for shorts: 步骤 4 中的图像 1，1

With a multimeter, check that the pads are not in contact, either from overflowing solder or from loose wires.
If there were any shorts, you might need to reheat the solder to make sure that stays within a single connector, or you might need to cut any wire that would be crossing from one connector to another.