Either the power supply aka high-voltage transformer is shot or there is a bad relay. Relays can be tested with an ohmmeter. Transformers will have to be tested with a voltmeter.
Based on your message, your monitor has a bad high voltage section. Probably the HOT (Horizontal Output Transistor) failed or shorted and it either killed the high voltage or there's a current fluctuation; that is why the picture went. Then, when you turned it off or unplugged it the protection circuit remained active.Once the high voltage fluctuates, that's the time the TV would create a buzzing sound.
There's a 75% probability it will require a high voltage and horizontal deflection amplifier overhaul. The normal cost of that should be less than $200 if you take it in.For this problem, I would suggest to contact a repair tech and have him take care of the problem.
Answers & Comments
Either the power supply aka high-voltage transformer is shot or there is a bad relay. Relays can be tested with an ohmmeter. Transformers will have to be tested with a voltmeter.
Based on your message, your monitor has a bad high voltage section. Probably the HOT (Horizontal Output Transistor) failed or shorted and it either killed the high voltage or there's a current fluctuation; that is why the picture went. Then, when you turned it off or unplugged it the protection circuit remained active.Once the high voltage fluctuates, that's the time the TV would create a buzzing sound.
There's a 75% probability it will require a high voltage and horizontal deflection amplifier overhaul. The normal cost of that should be less than $200 if you take it in.For this problem, I would suggest to contact a repair tech and have him take care of the problem.
Good luck!