What's going on

Wireless charging on an iPhone relies on electromagnetic induction. Inside the rear housing of your iPhone—just beneath the back glass—lies a flat, copper receiver coil. When placed on a Qi or MagSafe charging pad, the pad's transmitter coil generates an alternating magnetic field, inducing an electrical current in your iPhone's receiver coil. That energy flows through a small flex cable connector directly to the logic board's power management circuit.

When wireless charging suddenly stops working, the breakdown usually happens in one of three places: physical obstruction of the induction field, a thermal or software cutoff triggered by iOS, or a broken hardware circuit inside the phone.

Symptoms people notice

• The iPhone displays no response when laid flat on a Qi charger or attached to a MagSafe disc.
• The charging icon toggles on and off rapidly every few seconds, accompanied by continuous vibration or chime alerts.
• The charging pad's LED indicator flashes red or yellow, signaling an interference error.
• The back glass gets excessively hot near the Apple logo, but the battery level continues to drop.
• Cable charging through the Lightning or USB-C port works perfectly, confirming the battery itself accepts charge.

Likely causes

1. Case and Accessory Interference: Cases thicker than 3mm, cases with integrated metal kickstands, magnetic car mount plates, or credit cards tucked into a sleeve block electromagnetic energy.
2. Underpowered Power Supply: Connecting a wireless charging pad to a standard 5W USB port often provides insufficient current to trigger the phone's charging handshake.
3. Thermal Throttling: If the phone's internal temperature exceeds normal operating limits, iOS automatically suspends charging until the device cools down.
4. Software System Hang: Glitches within iOS power management services can temporarily disable inductive input until the device is rebooted.
5. Internal Wireless Coil Damage: Drops or prior back glass repairs can crack or tear the thin copper ribbon cable attached to the rear coil assembly.

Quick checks first

Before opening up the device or ordering replacement parts, rule out environment and setup issues:

• Take off the case: Test the phone completely bare. If it charges normally without a case, your accessory is too thick or contains non-compatible metal layers.
• Check the wall brick: Ensure your charger is plugged into a dedicated PD (Power Delivery) wall adapter rated for at least 20W.
• Center the alignment: For non-MagSafe Qi pads, tiny placement offsets can prevent connection. Center the Apple logo directly over the pad's center spot.
• Force restart: Perform a hard reboot to refresh software daemons responsible for regulating power intake.

When it's a real repair

If your iPhone passes all software and accessory checks, charges normally via cable, but completely ignores every wireless charger you try, you are dealing with a hardware failure.

On modern iPhones, the wireless charging coil is part of a complex flex cable assembly taped directly behind the rear glass. This assembly often links the wireless coil, NFC antenna, flash LED, and physical volume or power buttons. Common hardware failure points include:

• Torn coil ribbon cable: Hard drops or impact damage can snap the delicate copper traces linking the coil to the mainboard.
• Previous bad repair: If you recently had a back glass replacement where heat guns or laser machines were used, the coil flex may have been singed or severed.
• Board-level charging IC failure: In rare cases, the logic board chip responsible for processing wireless input (separate from wired charging) becomes damaged.

DIY vs professional repair

Replacing an iPhone wireless charging coil is an advanced DIY project. Because the coil sits directly under the back glass and is connected to thermal graphite sheets and housing buttons, access requires removing almost every internal component—including the screen, battery, and logic board.

If you have experience disassembling modern smartphones, you can follow specialized step-by-step repair walkthroughs on our /guides page. However, if your back glass is already shattered, attempting to pry out the old coil without damaging surrounding ribbon cables can be extremely challenging.

If you prefer not to tear down the entire housing yourself, you can send your device to a professional mail-in service or consult an expert through LML Experts to diagnose board-level issues.

Next steps

Start by isolating the problem: strip off all cases, switch to a 20W+ power adapter, and force-restart the phone. If the device remains unresponsive on wireless pads, search our /problems database for your specific iPhone model to see detailed tear-down steps.

When ordering replacement components, ensure you purchase an OEM-grade rear wireless flex assembly that includes the correct alignment magnets and NFC antenna. You can also read through user /reviews on various repair kit tools to ensure you have the right prying instruments and heat application equipment before starting.