How to Troubleshoot Your TX-NR636 Receiver Shutting Off Unexpectedly?

It sounds like you're dealing with a frustrating issue with your TX-NR636. From what you've described, it could be a short in the system, possibly related to the power supply or the HDMI board. A good first step is to unplug the receiver completely and try moving it to a different room, connecting it without any speakers or other devices. This can help determine if the problem persists in a different environment. If it still doesn’t turn on, there’s a chance the power supply unit (PSU) may have shorted out, which can lead to some components failing. Inspect the power supply and HDMI boards for any visible damage, particularly looking for bad capacitors. A bad capacitor typically has a curved top or may show signs of bulging or leaking. You can also check fuses for continuity using a multitester, as a blown fuse will often appear discolored. If you find any damaged components, you might consider replacing them. Replacement parts are available online, and if you’re not comfortable doing the repairs yourself, taking it to a shop for a more thorough inspection could be a good option. Given that the receiver is relatively new, it’s understandable to feel frustrated, especially if you’ve had issues after it was previously checked. Hopefully, this advice helps you get to the bottom of the problem.