iPhone Not Charging But Turns On When Plugged In, 6 Solutions
By Robert Jones · 2021-08-15
My iPhone fires up when plugged in, but the battery just won't charge – a common and infuriating problem. Let's troubleshoot it before heading to the repair shop.
Right, so you've got an iPhone that’s playing up. It fires up when it’s plugged into the wall, but that battery percentage just sits there, stubborn as a mule, refusing to budge. You see the lightning bolt, alright, that little sign that usually means “charging underway”, but nope. Nothing. Infuriating, isn't it? I’ve seen a fair few bits of kit act like this over my twenty-odd years tinkering with speakers, amps, and home cinema gear. Not just phones, mind you. Usually, it’s a symptom of some sort of power delivery hiccup. Could be the cable, the charger, the port, or even a software gremlin. It’s never a simple case of "oh, it's just broken" straight away. Always worth a bit of detective work. So, let’s roll up our sleeves and see if we can get your phone back to full health. **Quick Verdict: Don't panic, it's usually a simple fix like a grubby port or dodgy cable.** ### Who it's for: * Anyone with an iPhone that lights up but won't charge properly when plugged in. * Users who want to avoid a costly repair shop visit for what might be a simple issue. * Those looking for practical, real-world troubleshooting steps. ### Who should skip it: * If your iPhone is completely dead and doesn't even turn on when plugged in. * If you've already tried all these steps thoroughly without success (then it's likely a hardware fault). * Those who prefer to just buy a new phone at the first sign of trouble (each to their own, I suppose).  *iPhone Not Charging But Turns On When Plugged In, 6 Solutions — tested in the SpeakersMag workshop.* ## First Things First: The Obvious Stuff Before we start pulling our hair out and contemplating a trip to the Apple Store (and the inevitable dent in our wallets), let's run through the basic checks. You'd be amazed how often the simplest solution is staring us right in the face, and we just overlook it. It’s like when I spend an hour looking for my 10mm spanner, only to find it in my hand. Happens to the best of us. ### Give Your Charger & Cable the Once-Over Now, this is probably the most common culprit. Grab your charging cable and give it a good inspection. Any fraying near the connectors? Are there any kinks or sharp bends? What about the connector itself – are the pins bent, or is it looking a bit corroded or scratched? These little cables live a hard life, don't they? Tucked into pockets, shoved into bags, yanked out of sockets. They take a proper beating. I’ve got a drawer full of these things in the workshop, and half of them are probably ready for the bin. A damaged cable often can't deliver the steady, clean power your iPhone needs to charge properly. If you've got another cable kicking about – ideally an official Apple one, or at least a certified MFi (Made For iPhone) accessory – swap it out. Seriously, do it. I've seen cheap, uncertified cables cause all sorts of bother, from slow charging to outright refusing to work, and sometimes even frying the charging chip in the phone or the charger itself. It’s just not worth the fiver you save. Next, have a look at the charger itself, the little brick that goes into the wall. Is it getting unusually warm? Does it feel a bit loose in the socket? Does it look physically damaged? If you're using one of those multi-port USB chargers, try a different port. Again, if you've got another power adapter, especially an official Apple one, give that a whirl. Sometimes the internal circuitry in these things can go a bit wobbly. And for goodness sake, make sure the wall socket itself is working. Plug something else in, a lamp, a radio, anything. Just to rule out a duff socket. It sounds daft, I know, but I’ve spent twenty minutes once trying to figure out why my soldering iron wasn't heating up, only to realise the extension lead wasn't plugged into the wall. Embarrassing, but it happens. ### Clear Out the Gunk: That Charging Port Needs a Clean This one's a classic, a proper old chestnut. Over time, that tiny little charging port on your iPhone becomes a veritable magnet for dust, lint, pocket fluff, crumbs, you name it. It gets compressed in there, forming a surprisingly solid barrier between your charging cable and the phone's internal connections. The cable might *feel* like it's fully inserted, but it might not be making proper contact with all the pins. Believe me, I’ve cleared out more fluff from these ports than I’ve had hot dinners. Get yourself a small, soft brush – an unused toothbrush is perfect for this, or one of those little interdental brushes. A wooden toothpick works a treat too. The key here is to be gentle. You're not trying to excavate a Roman relic; you're just carefully scraping out any crud. Point your phone downwards so the debris falls out. Take your time. You don't want to bend or damage those tiny, delicate pins inside. You'd be genuinely surprised how much of a difference this seemingly insignificant step can make. It’s often the prime suspect. ### The Old Turn-It-Off-And-On-Again Trick It sounds almost comically simple, doesn't it? But honestly, a good old-fashioned restart can work wonders. Modern phones are essentially mini-computers, and just like your desktop PC or a temperamental mixing desk, they can get bogged down with temporary software glitches. The charging circuit might just be in a bit of a tizzy, and a fresh start can often clear that up. Here's how you do it for most recent iPhones: Hold down the side button and either the volume up or volume down button simultaneously until the "slide to power off" slider pops up. Drag that across. Give it a minute or so to completely shut down. Then, press and hold the side button again until you see the Apple logo appear. Once it's booted back up, plug it in and see if that's kicked the charging circuit back into life. Sometimes, that's all it takes. Seriously. Don't underestimate the power of a good reboot. ## Digging a Bit Deeper: Software and Settings If the basic checks haven't done the trick, it's time to delve a bit deeper. We're moving past the physical stuff and into the software realm. Sometimes, iOS itself can be the culprit, either due to a bug or a misbehaving setting. ### Check for iOS Updates Apple is constantly releasing updates for iOS, and these often include bug fixes. It's not unheard of for a particular iOS version to introduce issues with charging or battery management. If there's an update available, it might just contain the fix you need. Go to `Settings > General > Software Update`. If an update is available, download and install it. Make sure your phone has enough battery (if it's holding any charge at all) or keep it plugged into a known-good charger during the update process. It's a good habit to keep your software up to date anyway, not just for bug fixes but for security too. I always keep my studio software updated; you never know what crucial little patch might be in the next version. ### Reset All Settings (Not a Factory Reset!) This is a step that often gets overlooked. "Reset All Settings" is different from a full factory reset. It won't erase your data, photos, or apps. What it *does* do is reset all your customised settings – things like Wi-Fi passwords (you'll need to re-enter them), home screen layout, privacy settings, network settings, and so on. It can often clear out corrupt preference files or conflicting settings that might be messing with your phone's ability to charge. To do this, go to `Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings`. You'll need to enter your passcode. Don't worry, as I said, your data is safe. It's a bit of a faff having to put all your Wi-Fi passwords back in, but it's less hassle than a full restore. Worth a punt if nothing else has worked. ### Disable Optimised Battery Charging Modern iPhones have a feature called "Optimised Battery Charging". What it does is learn your charging habits and aims to reduce battery ageing by charging your iPhone past 80% only when it predicts you'll need it. So, if you plug it in overnight, it might hold at 80% for hours before topping it up just before your alarm goes off. While it's great for battery longevity, sometimes this feature can get a bit confused, especially if your habits change, or if there's a software bug. If your phone seems stuck at 80% or thereabouts, and you're sure it should be charging fully, try temporarily disabling this. Go to `Settings > Battery > Battery Health & Charging > Optimised Battery Charging` and toggle it off. See if that makes a difference. If it does, you can always turn it back on later once the underlying charging issue is resolved. I appreciate the tech behind it, but sometimes these "smart" features can be a bit *too* clever for their own good. ## Getting Serious: DFU Mode and Potential Hardware Issues Alright, if you've gone through all the usual suspects and your iPhone is still giving you grief, we're getting into the more serious territory. This either points to a deeply ingrained software problem that a simple restart won't fix, or, regrettably, a hardware fault. Before you head to the repair shop, there's one more significant software step we can try: DFU Mode. ### DFU Mode (Device Firmware Update): The Last Software Resort DFU Mode is a bit like performing open-heart surgery on your iPhone's software. It's a deeper restore than a normal factory reset. It completely reinstalls the entire operating system and firmware of your iPhone. This can fix some really stubborn, deep-seated software-related charging problems that might be preventing the charging chip from doing its job properly. **A HUGE WORD OF WARNING HERE:** *Entering DFU Mode and restoring your iPhone will wipe your phone completely*. Every photo, every app, every message will be gone. So, before you even *think* about this step, make sure you have a full, recent backup of your iPhone. iCloud or a computer backup via iTunes/Finder will do. If you don't back up, you'll lose everything, and trust me, that's a far worse problem than a charging issue. ### How to Enter DFU Mode (Steps vary slightly by model, these are for most recent iPhones): 1. **Connect your iPhone to a computer:** Make sure you have iTunes (on Windows or older macOS) or Finder (on macOS Catalina and later) open. Use a reliable, official Apple cable for this. 2. **Quickly press and release the Volume Up button.** 3. **Quickly press and release the Volume Down button.** 4. **Press and hold the Side button** (the power button) until your iPhone's screen turns completely black. This might take 10-15 seconds. 5. **While *still holding* the Side button, press and hold the Volume Down button** for exactly 5 seconds. Don't let go of the Side button yet! 6. **After 5 seconds, release the Side button but *keep holding* the Volume Down button** for another 10 seconds. The screen should remain black. If you see the Apple logo or "Connect to iTunes/Computer" screen, you've stayed in DFU Mode too long or pressed a button incorrectly, and you'll need to start again. If you've done it right, your iPhone screen will remain black, but your computer should detect an iPhone in recovery mode (even though it's technically DFU). iTunes or Finder will then prompt you to restore your device. Go through the restore process. Once it's done, set up your iPhone from your backup and see if the charging issue is resolved. This is a fairly advanced step, and if you're not comfortable doing it, I'd advise seeking professional help. Messing it up won't necessarily brick your phone, but it can be frustrating to get into DFU mode properly. ### Potential Hardware Failure If even a DFU restore doesn't sort out your charging problem, then sadly, it's highly likely you're looking at a hardware fault. This could be a few things: * **The charging port itself:** Despite your best cleaning efforts, the port's internal pins or circuitry might be physically damaged or worn out. * **The battery:** While your phone might turn on, the battery itself could be faulty and unable to hold or accept a charge. You can check your battery health in `Settings > Battery > Battery Health & Charging`. If it's significantly degraded, that could be part of the problem. * **The charging IC (Integrated Circuit):** This is a small chip on the iPhone's logic board responsible for managing power and charging. If this chip goes bad, no amount of software trickery will get your phone to charge. This often happens if you've been using cheap, uncertified chargers or cables, or if the phone has experienced a power surge or water damage. This is a much more complex repair. At this point, your best bet is to take it to an authorised Apple service provider or a reputable independent repair shop. They'll have the diagnostic tools to pinpoint the exact hardware issue. Be prepared for a repair cost, especially if it's the charging IC, as that often involves replacing the entire logic board, which isn't cheap. Always get a quote first. ## Comparison: Troubleshooting Steps | Step | Effort | Risk | Cost | Common Fix For | Best For | Potential Downside | | :------------------------------ | :----- | :--- | :--- | :------------- | :------- | :------------------ | | **Cable/Charger Swap** | Low | Low | £0-£20+ | Damaged accessories | Quick initial check | Not always the cause | | **Port Cleaning** | Low | Low | £0 | Lint, debris | Very common fix | Can damage pins if too rough | | **Restart iPhone** | Very Low | Very Low | £0 | Software glitches | First port of call | Won't fix hardware | | **iOS Update** | Medium | Low | £0 | Software bugs | General maintenance | Needs some battery charge | | **Reset All Settings** | Medium | Low | £0 | Conflicting settings | Deeper software issues | Re-enter Wi-Fi, custom settings | | **Disable Optimised Charging** | Low | Low | £0 | Charging stuck at 80% | Specific charging behaviour | Might shorten battery lifespan slightly | | **DFU Mode Restore** | High | Medium | £0 | Deep software corruption | Last software resort | *Wipes all data*, time-consuming | | **Hardware Repair** | N/A | N/A | £50-£300+ | Damaged port, battery, IC | Definitive fix for hardware | Costly, phone might be off for days | ## Frequently Asked Questions ### Q1: My iPhone turns on, but the battery icon shows a red bar, even when plugged in. What does that mean? A red battery icon usually means your battery is critically low. If it stays red and doesn't show the charging lightning bolt (or the percentage doesn't increase), it points to the same issue – the phone isn't receiving or registering the charge properly. Go through the steps above, especially checking your cable, charger, and cleaning the port. The phone has enough juice to power on, but not enough to initiate a healthy charging cycle or hold the charge. ### Q2: I've tried everything, and it still won't charge. Is it worth replacing the battery? If your battery health (found in `Settings > Battery > Battery Health & Charging`) is very low, say below 80%, a battery replacement is a good idea anyway, and it *might* solve your charging issue if the old battery was the primary fault. However, if the problem lies with the charging port or the charging IC on the logic board, a new battery won't help. Get a diagnosis from a reputable repair shop first. They can tell you if it's truly the battery or something more serious. No point throwing good money after bad, eh? ### Q3: Can using non-Apple chargers or cables damage my iPhone's charging system? Yes, absolutely. While many third-party accessories are perfectly fine, especially those with MFi certification, cheap, unbranded, or counterfeit chargers and cables can be dangerous. They often lack proper voltage regulation and protection circuits. This can lead to slow charging, overheating, battery damage, or even outright frying the charging IC on your iPhone's logic board. Always stick to genuine Apple accessories or reputable MFi-certified brands. It's just not worth the risk for the sake of saving a few quid. ### Q4: My iPhone charges sometimes, but not always. What's going on? Intermittent charging is particularly frustrating, but it often points to a loose connection or a component that's on its way out. The charging port is a prime suspect here – perhaps some lint is intermittently making contact, or one of the internal pins is slightly bent. A dodgy cable is also a strong contender; the internal wires might be breaking down, making connection only when bent a certain way. Try a different cable and give that port a good clean. If the issue persists, it could be a sign of a failing charging IC that's struggling to maintain a stable connection. ### Q5: Will using a wireless charger solve this problem? Possibly, if the issue is *solely* with your iPhone's physical Lightning port or the charging IC *specifically related to wired charging*. If your phone charges wirelessly without a hitch, then you've narrowed down the problem quite a bit – it's definitely a wired charging component that's failing. However, if the fault is with the battery itself or a more general power management issue on the logic board, wireless charging might not work either, or it might be very slow and inconsistent. It's worth trying if you have a wireless charger available, just to help diagnose. ## Final Word There you have it. A good run-through of pretty much every trick I know for when your iPhone decides to be a bit temperamental with its charging. It's almost always something simple, isn't it? That bit of fluff in the port, a cable that's seen better days, or a software glitch having a laugh. Very rarely do I find myself needing to take a piece of kit in for proper repair without at least trying all these basic troubleshooting steps first. So, before you despair and start eyeing up a new phone, give these suggestions a go. Take your time, be gentle, and work your way through the list. You might just save yourself a significant chunk of change and the hassle of a repair. And let's be honest, who doesn't love fixing something themselves? Gives you a bit of a glow, doesn't it? Now, if you'll excuse me, I've got a crossover network to re-solder. Cheerio!