What Causes Power Issues in Onkyo TX-SV727 and How to Fix Them?

Understanding the Issue with Onkyo TX-SV727 Power Switch

When powering up your Onkyo model TX-SV727 and encountering a clicking noise along with the display lighting up and then going off repeatedly, it's essential to diagnose the potential causes effectively. This guide will help you understand the issue, possible solutions, and best practices for handling similar problems.

Possible Causes of the Issue

1. Blown Fuse: A common cause for power-related issues in electronic devices, including AV receivers, is a blown fuse. This can occur due to power surges or internal component failures.

2. Faulty Power Supply: The power supply unit (PSU) may be malfunctioning, which can lead to intermittent power issues. If the PSU isn't delivering consistent voltage, the receiver may not power on correctly.

3. Faulty Power Switch: The power switch itself could be defective, causing the clicking sound and erratic behavior in the display. This may require inspection or replacement.

4. Electrical Short: There may be an internal short circuit, which can prevent the receiver from powering on properly.

5. Software Glitch: Occasionally, software issues can cause devices to behave unexpectedly. A reset may resolve these issues.

Step-by-Step Troubleshooting