E
Elizabeth MasonSep 8, 2025
Why does my Sony GDM-F520 Trinitron hum when I turn it on?
- CCynthia HollowaySep 8, 2025
The hum you hear right after turning on your Sony monitor is the sound of the auto-degauss cycle. When the power is turned on, the monitor is automatically degaussed for a few seconds. If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result.