Safety first: Unplug the unit. Power supply troubleshooting involves exposure to mains voltage; proceed only if you are trained and equipped.

Check outlet: Verify the wall outlet is delivering correct voltage using another appliance or a tester. Avoid using extension cords or power strips.
Inspect power cord: Examine the power cord for cuts, kinks, or burn marks. Replace if any damage is found.
Check internal connections: Remove the cover and inspect the AC input terminals, strain relief, and any line filter board for loose screws or connectors.
Visual board inspection: On the main control board, look for bulged capacitors, burned resistors, or cracked solder joints in the power supply section.
Board replacement: If there are clear signs of power supply failure, replace the main control board as a complete assembly. Component-level repair is not recommended for most users.

If you are not experienced with mains electronics, have a professional perform these checks.

E9 appears and the unit may not power up fully or may shut off randomly.

Possible Causes