Android Phone Overheating

• Avoid charging your phone wirelessly: Wireless charging is less efficient and therefore generates more heat as a byproduct.
• Close high power consumption apps: Apps that are a bit more resource intensive can consume more power and can cause your phone to heat up more easily. This includes GPS, Games, or Cloud Services that sync in the background.
• Update your phone's software: Newer versions of Android or third-party apps could be poorly optimized and an update should resolve this.

Phones are devices with very little headroom to dissipate the heat they generate. Think about a computer, which typically has fans to move air around inside. Galaxy phones don’t have room for this sort of cooling and must relieve thermal buildup passively.

• Move to a cooler environment. It may just be that a high ambient temperature is forcing a hotter internal temperature.
• Remove your case, especially if it is one that envelopes the entire phone. It could be trapping heat in.
• For more rapid cooling, turn your device off.

Batteries are one of the major sources of heat in a phone due to the constant energy exchange within them. If your battery is failing, or at the end of its life, it may generate more heat than normal.

• Check your battery health. Samsung's official method of testing this is using the Samsung Members app, but a third party app will give you more data. Accubattery gives a wide range of statistics to base decisions on.
• Search for signs of battery swelling. Is there localized screen discoloration? Is the screen lifting along one side?
• Replace the battery if there are any indications of failure. Exercise caution when handling the battery—lithium-ion batteries can be hazardous if they are damaged.

In order for you to get an overheating warning, something in your phone has to know the temperature exceeds expectations.

• Sensors on the charge port assembly are common triggers. Open your device and unplug your charge port from the logic board. Reference the repair guide for your phone if you're not sure which cable this is. Power it up and see if you still get a warning. Replace the charge port assembly if this resolves the issue.
• Other parts may also have thermal sensors, but they are not as well documented. If you are feeling adventurous, try disconnecting other components. The main flex cable (which carries signals from the daughterboard to the mainboard), camera, wireless charge coil or other major components are prime suspects.

One of the electrical lines in your phone may have developed a short-to-ground. This simply means that rather than energy being held in its circuit, it is sent straight to the ground.

• This may be the case if your phone got very hot and now will not power on.
• Attempt to find the short by booting on a minimal hardware configuration.
  1. Open up the device and disconnect anything that is not necessary for you to power the phone on. For most Samsung phones, this means keeping battery, display and the power button connected.
  2. Try to power the phone on.
  3. If the phone boots normally on the minimal setup, reconnect the parts one by one. Power off and disconnect the battery while you connect any additional parts. Be especially suspicious of the home button and front-facing camera cables.
• If the issue reappears after connecting a specific part, replace that one.
• If the issue is still present after this, your issue is likely the board itself.

Ultimately, all the temperature information travels to the logic board. The board is also home to many sensors itself. A poor electrical connection, faulty board sensor, or even a misbehaving chip could be your issue.

• Board-level issues are most easily corrected by replacing the board.
• Contrary to popular belief, the board itself can be repaired. However, it requires specialized tools and microsoldering know-how. This is not something most people can do themselves, but many independent repair shops can do it for you! Ask around to find board-level repair specialists near you.