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PS does not just shut down unless it is defective or there is some short in another location that is telling it to shut down to prevent further damage to components. Which is it? Sure the PS you put in is good? If so, issue is with some other part of the set that you have not already replaced.
If the power light remains on after it goes black, the problem is the inverter board that powers the back light behind the screen, the cause is usually bad capacitors. To fix it, the board must be replaced or attempt made to repair the inverter board.
Choose within this options with regards to your monitor:
1. You could replace your monitor with a new one.
2. Or you could send someone or send it to a technician to repair your monitor.
Boot Up Problem:
1. Try checking the Power Supply Unit (PSU) if it give out 12Voltz. If not you could replace it with new PSU.
2. Check the motherboard if there are some blown out Capacitors. If there is, send it to a technician to replace it. If none, replace your Processor. That is the defective. That causes the boot up problem.
On boot up screen. Of course it will not show a boot up screen because there is a problem on your monitor. And so, there is also a problem on your motherboard (Processor or Capacitor).
Hope this might help. Thanks.
Ok, another words, monitor powers up for few seconds and shuts down by itself. If green LED on the front panel turns off as well or stays on? If stays on, then inverter turns into protection mode because of old backlight lamps. If it turns off in same time with an image on the screen, then there are some bad electrolytic capacitors in the power supply.
you need to replace the power supply. The fan sound is the fan for the power supply and not the computer. for cheap parts or used goto headgap's. They know what you need and probably even help you replace it yourself.
Sounds like the Backlight balance sensor circuit is shutting down the inverter supply. A weak bulb can cause this or a malfunctioning sensor circuit can cause it too. Best method to troubleshoot is to substitute good bulbs; if it still shuts down, look for a pair of small electrolytic caps on the inverter board near the bulb sockets. They may be weak. Monitor Mike.
Your problem lies ion either your back light inverter or in the backlight tubes ( bulbs) which are embedded in the LCD display. The display has 4 ccf tubes inside of it that provide the backlighting. if any of these tubes are bad the backlight inverter will shut off after about 1 second. Because there are 4 of these tubes inside the screen you may not notice ( brightness wise) if 1 of them is out.
You can buy another backlight inverter( about $70.00 US) however, from my experience that would be a waste of money. Unfortunately, I think your problem probably lies in your LCD and the backlight tubes are not replaceable.
Hope this helps all who have this problem.
You are experiencing an inverter board failure. You will need to replace or repair the inverter. The inverter drives the CCFL lamps that illuminate the screen if the lamps draw to much current or components on the board are overheating it will shut down the backlights. Some monitors have cold solder joints on the toroidal coils of the inverter that causes this problem, very typical with HP monitors, If you are handy with a solder iron you may try just re-soldering board and replacing push-pull transistors for a few more years of use. Provide make and model and I can be more specific about probable cause and solution.