What should be the last step after performing all checks on the LCD components?

Turning on the device is indeed the last step after performing all checks on the LCD components. This step is crucial as it allows you to verify whether the troubleshooting steps taken were effective. By powering on the device, you can observe the functionality of the LCD components and ensure they are working correctly. It serves as a practical verification that confirms if any issues have been resolved during the checks.

Conducting thorough checks on the LCD components would typically include inspecting the connections, ensuring that there are no physical damages, and checking for any software or settings issues. Once these checks are complete, switching on the device allows you to see if the screen lights up correctly and displays the intended visuals, confirming that the components are functioning as they should.

The other options, while important in their respective contexts, do not logically follow the troubleshooting process. Documenting findings would usually occur after verifying the results, as you would want to record the outcome of turning on the device. Reconnecting external peripherals may be part of the deployment or setup phase but is not directly related to the checks on the LCD itself. Replacing the primary battery might be required only if it was determined to be a source of issues during the LCD checks, but it is not a necessary step in the workflow after those