ON and OFF Issue Fixed ✅

Introduction

This tutorial will guide you through fixing a phone that keeps turning on and off. Based on a recent repair video by Father Joe Phone Repairs, we will cover the diagnostic process, necessary tools, and step-by-step instructions to resolve the issue. Whether you're a beginner or have some technical experience, this guide will help you understand the repair process.

Step 1: Diagnose the Issue

• Ask Questions: Before starting, gather information from the customer about when the problem began and what may have caused it. This context is essential for troubleshooting.
• Check the Phone: Boot the phone to observe its behavior. Note the patterns of turning off and on. In this case, the phone powered up but shut down repeatedly.

Step 2: Gather Necessary Tools

• Multimeter: This device is crucial for testing the battery output and diagnosing electrical issues.
• Jumper Wire: You'll need a small jumper wire for the repair.
• Tape: To secure the battery after repairs.
• Screwdriver: To open the phone casing.

Step 3: Check Battery Output

• Set Up the Multimeter: Turn on the multimeter and set it to 20 volts.
• Test Battery Voltage:
  • Without Powering the Phone: Connect the multimeter leads (negative to negative, positive to positive) to check the battery voltage. A fully charged battery should read around 4.2 volts.
  • While Powered On: Power on the phone and again check the voltage. If it fluctuates significantly (e.g., 3.8 to 4.2 volts), the battery is likely the issue.

Step 4: Remove the Battery

• Carefully remove the battery from the phone. Ensure you do not damage the screen flex cable during this process.
• Open the Battery Head: Access the battery management system (BMS) to inspect the internal components.

Step 5: Inspect the Fuse Resistor

• Locate the fuse resistor within the battery. Note that some batteries may not have this, but many phone panels do.
• Importance of the Fuse Resistor: This component protects the phone from electrical issues. If it's faulty, it can cause the phone to shut down unexpectedly.

Step 6: Repair the Fuse Resistor

• Using a Jumper Wire:
  • Connect the jumper wire across the fuse resistor. This allows for some flexibility in case of future issues, as the jumper wire will act as a fuse.
  • Make clean and precise connections to ensure a reliable repair.

Step 7: Secure the Battery

• After successfully adding the jumper wire, use tape to cover the battery head securely.
• Reassemble the Phone: Carefully place the battery back into the phone and ensure all components are connected properly.

Step 8: Test the Phone

• Power on the phone to check if the problem is resolved.
• Observe the booting process to ensure it does not turn off unexpectedly. A stable voltage reading during this test indicates a successful repair.

Conclusion

You've successfully repaired the phone that was turning on and off. By diagnosing the issue, testing the battery, and addressing the fuse resistor, you can often resolve these types of problems. If you encounter similar issues in the future, remember to follow these steps and use the right tools for effective troubleshooting. Don't hesitate to ask questions or seek further assistance as needed. Happy repairing!