Chosen Solution

I have a iPhone 5 which do the following: If I remove the battery and charge it outside the iphone, the iphone is working but is getting VERY hot during usage and often shows a “overheating“ warning (it takes 1-2 hours until the battery is empty I would say)If the battery in the device is empty and I put a USB wire into the device it show a apple logo, shuts down, shows an apple logo, shuts down … repeat thatIf I charge the battery outside the device and put it back, add an USB wire, the iphone is showing a flash mentioned its charging, but thats not the case. The % drops quickly and the device is very hot and shuts downOn the logic board above the SIM card is a place which is covered by a metall shield this place is the one which becomes very hotputting the device into airplane mode didn´t help to cool it downI already replaced the dock and battery via ifixit replacements but that didn´t solved the issueI tried multiple USB wires already Any ideas?

@berndw since “the iphone is showing a flash mentioned its charging, but thats not the case. The % drops quickly and the device is very hot and shuts down” I would consider this “fake” charging. Since you already changed the battery and the Lightning connector, looking at the schematic I would focus on checking

  1. Q2
  2. U2

The area right above the Sim card is the A6 processor and U2 which is a PMIC and USB Control IC CBTL1608A . We would need to see exactly where your phone is heating up. Post some images of your board. Adding images to an existing question This sure sounds like a job for experienced microsolder experts like @refectio and/or @arbaman

Hi @berndw When you install a new battery, does the heat come from the top of the phone? You might have a failed WiFi Chip with a major short. You can confirm this by installing a charged battery and checking your WiFi connection to see if it has been “greyed out”. It is possible to replace this chip, but the cost and process involved is probably not worth it for this model of iPhone.