"iPhone 12 Pro No Power Repair" Do you want to learn how to fix no power issue in iPhone 12 pro, do you want to learn iPhone 12 pro no power diagnosis and repair. Are you searching for iphone 12 pro no power repair, iPhone 12 pro diagnosis and repair, iphone 12 pro no power troubleshooting and repair, iphone 12 no power, iphone 12 mini no power, iphone 12 pro max no power or iphone 12 pro no power. If yes, Infoguide Ng has brought a complete step by step guide on how to diagnose and repair iPhone 12 pro no power issue. This article detailed the live diagnosis and repair of an iPhone 12 Pro suffering from a "no power" issue. I start by checking the DC power supply draw and then testing various power rails, including those around the NAND and the Power Management Integrated Circuit (PMIC) After preliminary checks were inconclusive, i splits the logic board "sandwich" and quickly discovers the cause: a loose or detached boost coil, which is noted as a common problem for the iPhone 12 Pro model. The process concludes with the replacement of the boost coil, which immediately restores the phone's functionality and allows it to boot successfully.
The following article details the live diagnosis and repair process for an iPhone 12 Pro motherboard experiencing a "no power" issue.
Initial Diagnosis and Testing
The preliminary step in diagnosing the board involved using DC power supply probes to observe the phone's behavior when prompted to boot. Upon pressing the power button, the power supply registered a small amperage spike. This specific symptom often suggests a power rail failure, such as a shorted power rail, or some other factor preventing the CPU from initiating.
The first assumption made in troubleshooting was the presence of a bad or shorted power rail. Checking the NAND power rails is usually the most convenient initial step because they are often exposed on the top layer of the board. The 2v6, 1v2, and 0v9 NAND lines were checked and appeared normal, indicating that a NAND short was not the issue in this case, despite it being a very common problem.
Deepening the Investigation
After ruling out external NAND shorts, the motherboard was removed from the housing. The same behavior (the small amperage spike) persisted when the motherboard was out of the device. The focus then shifted to the area surrounding the PMIC (Power Management Integrated Circuit).
Diagnostic work involved reviewing the board view software. The plan was to check as many power rails as possible, particularly those with a coil connected to both the PMIC and the CPU, as well as the RAM line (1v8 S2). Since most of the readily accessible power rails appeared fine, the decision was made to split the sandwich board to access the more inner components. A heating platform was set to 235–230 degrees (likely Celsius) to facilitate the split.
Identifying the Failure Point
Once the motherboard sandwich was split, the small amperage spike behavior was retested. During this phase, it was discovered that the boost coil had fallen off.
This finding was significant, as a loose boost coil is recognized as a common problem on the iPhone 12 Pro model. Experience led the diagnostician to specifically check this area. The boost coil is essential for the Boost circuit, which functions to boost the voltage when it drops too low; without this circuit present, the phone cannot operate. General troubleshooting advice indicates that if there is a small spike or no amp draw before or after prompting a boot, checking the NAND first, followed by the Boost coil (especially on the 12 Pro and 12 Pro Max series), is crucial.
Repair and Verification
The resolution was straightforward: obtaining and installing a new boost coil. A replacement boost coil was sourced from an 11 Pro board.
Once the new boost coil was secured, the phone was prompted to boot. The amp draw immediately appeared "much better," changing from the problematic small spike to a normal indication of booting. On the 12 Pro, data can be pulled using only the top board. The phone successfully powered on and displayed the Apple logo, ensuring the customer would regain access to their photos.
The successful repair provided access to the phone data, concluding the process.
I believe this step by step guide will help in diagnosing and repairing of your iPhone 12 pro no power issue.
Here's a video that explain iPhone 12 Pro No Power Repair (Troubleshooting And Repair)
