Has your iPhone or iPad stopped charging properly? Check this!

The other day I had a problem where one of my test iPhones wasn't charging up properly. After some troubleshooting I came across a weird issue that I've not encountered previously.

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Has your iPhone stopped charging properly when you plug in the Lightning cable? Is it charging slowly? This is a very common issue, but thankfully, the fix is an easy one.

The problem may not be with the iPhone, but with your charging cable.

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Take a look at the Lightning connector on the cable you are using. Does it look like this?

Look closely at the connectors to check for signs of oxidation on them. It will show up as black marks on the gold connectors that don't rub off easily. 

The way I remove this is with a splash of DeoxIT D5 -- my secret weapon when it comes to removing corrosion on circuit boards and components, especially things that have been exposed to the elements -- and giving it a quick rub with my fiberglass scratch brush. If you are persistent, you could use a pencil eraser, a little rubbing alcohol, and a lot of elbow grease to remove the oxidation.

Here's the complete process I used to clean my Lightning connector:

What's interesting is that this doesn't seem to happen on the Lightning connectors used on the USB-C-to-Lightning cables. These seem to be silver in color and not gold and seem to resist the oxidation better. 

So, check your cables, people. Especially the Lightning connector. And if you find some particularly nasty looking ones, feel free to share photos with me over on Twitter.