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Step 3Trace the USB connections.
In order to solder the correct USB wires to the bottom of the USB port, we first have to figure out which one goes where.
You'll need an OHM meter with a continuity check, or some other type of light bulb continuity checker.
First, plug in the USB cable that came with the UPS. Use the OHM meter to determine which solder pad on the bottom of the PCB goes to which pin inside the other end of the USB cable.
In the case, the wires were 4-3-2-1, from left to right, looking at the end of the cable.
You'll need an OHM meter with a continuity check, or some other type of light bulb continuity checker.
First, plug in the USB cable that came with the UPS. Use the OHM meter to determine which solder pad on the bottom of the PCB goes to which pin inside the other end of the USB cable.
In the case, the wires were 4-3-2-1, from left to right, looking at the end of the cable.
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