Troubleshooting a failed thermal sensor on a hard drive PCB can be difficult, as it requires specialized equipment and expertise. Here are some general steps that you can take to troubleshoot the issue:
1. Check for error messages: If your computer is displaying error messages related to the hard drive temperature, this may indicate an issue with the thermal sensor. Write down any error messages that you see and look for information about them online.
2. Check the hard drive temperature: You can use third-party software to check the temperature of your hard drive. If the temperature readings are consistently high, this may indicate an issue with the thermal sensor.
3. Inspect the PCB: Inspect the hard drive PCB for any signs of physical damage, such as cracks or burns. Physical damage can cause issues with the thermal sensor.
4. Replace the PCB: If you have determined that the thermal sensor has failed and cannot be repaired, you may need to replace the entire PCB. Make sure to use a replacement PCB that is compatible with your hard drive's specifications.
Note: It is important to exercise caution when working with electronic components, particularly when dealing with voltage. If you are unsure or uncomfortable with performing these troubleshooting steps, it is recommended to seek assistance from a professional technician.