Faulty Main Circuit Breaker:
1. Check if the main power switch circuit breaker has tripped off due to power overload or a short circuit. Ensure that all connections are correctly plugged in and there is a steady power supply to the device. Reset the main circuit breaker if necessary.
Defective HDMI Cable:
1. Make sure that your HDMI cable is in good condition and not excessively bent or kinked. Try switching out the HDMI cable with a different one to see if that resolves the buzzing sound and black screen issue.
Loose Connections:
1. Verify that all the cables and connections, including AV cables, power cables, and connectors to other devices, are properly plugged in and secure. Loose connections can disrupt audio-visual signals.
Overheating:
1. Ensure that the TV has sufficient ventilation. Blocked vents can cause the TV to overheat, leading to various issues, including buzzing sounds and display problems. Check if the vents are free from dust or obstructions. Place the TV in a well-ventilated area and allow for proper airflow around it.
Issues within the TV Itself:
1. If the buzzing sound persists even with secure connections, proper ventilation, and different HDMI cables, it's likely that there is an internal issue within the TV. This could include circuit or hardware faults that affect the proper functioning of the audio-visual system.
If you have performed the above checks and the problem still persists, consider contacting RCA customer support, consulting with certified TV repair technicians, or exploring repair alternatives depending on the extent of the problem and warranty status.