Good day sir/ma'am hi, if you monitor turns black, here are the more common probable reasons;
- Your PC went to standby the screen saver kicks in, just reset your PC then the monitor will power on again.
- If not, your PC is not giving you video signal, check to see if another monitor will work, we then know what part is bad, the monitor or the PC.
- If the monitor is the culprit, then your monitor's back light or inverter board just went bad. you need to replace it.
There are usually two main circuit board on your monitor, the power supply board and the main board, at this point, you need a professional to do the work.
The process is opening the monitor and locate the LCD screen connection to the main board, to check if the contact is snug. we then test. if still nothing happens,
Then we go to the power supply board, to check for connection problem, It would help if there are light signs, like blinking, orange, red, green and the likes?
Anyway, if the power supply board is not the faulty one, we substitute the main board with a good one and test to see if it will work, test again.
If still no respond, we test a new LCD unit, then test, at this point the monitor is working already, if not, we then replace the power supply board. Huh, very expensive, we already have a new monitor.
Reminders, these are to be done by a trained personnel. If you attempt to service this, its expensive, so I suggest you let the service shop do this for you to replace only the faulty part.