### 1. Original Behavior and Diagnosis

* **Symptom:** The device charged and operated normally when connected to the charger, even allowing it to be unplugged and continue working. However, the failure occurred when turning it off; it wouldn't turn back on independently unless the charger was reconnected.

* **Diagnosis Process:** Exhaustive tests were performed, ruling out various components like the power button, battery, and motherboard capacitors, ultimately finding a damaged P-type MOSFET in the power section.

### 2. Tools and Materials Needed

* Precision multimeter

* Soldering station

* Flux and isopropyl alcohol

* Precision screwdrivers

### 3. Module Disassembly

* Carefully remove the screws to open the module.

* Separate the pressure tabs.

* Carefully lift the back cover where the battery is attached, being mindful of the wiring connected to the main board.

### 4. Repair Procedure

* Locate the power circuit section where the P-type MOSFET identified in the diagnosis operates.

* Apply flux and use the soldering station to extract the defective component.

* Once the P-type MOSFET causing the power-on failure is removed, clean the area with isopropyl alcohol and proceed as needed to restore the power line.

### 5. Subsequent Tests and Reassembly

* Test the receiver's autonomous power-on without connecting an external charger.

* Correctly align the circuit board inside the casing, securing the buttons and pins.

* Close the cover, tighten the screws, and perform the final operational test.