Re: Re: My Monitor Suddenly Doesn’t_Show_Anyt
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Posted by trunterzx on May 10, 2008, 1:22 pm
Please log in for more thread options >trunterzx wrote:
>> One day when I came back to use the computer, which was switched
>on, I
>> kept pressing the keyboard but nothing came onto the monitor. I
>> switched off the power and switched on again, the screen came out >for
>> a while, and went off again. So I decided to unplug the power
>plug of
>> the monitor and plug it back, and somehow the problem was solved.
>But
>> now, the problem came back, and now unplugging and plugging the
>> monitor power can no longer solve the problem... Is my monitor >spoilt,
>> or does the problem lie somewhere else?
>> >> Please help! Thanks. >
>You don’t say whether your monitor is an LCD, but I’ll >assume it is. > >The monitor has a backlight inside it. The LCD panel controls >the transmission of light, and there is a light source behind >the panel. > >The majority of LCD monitors have one or more CCFL (cold cathode >fluorescent) lamps for backlights. They need 700 to 1000V AC to >operate. A small rectangular circuit board has an "inverter", >which converts a low voltage like the 12V DC inside the monitor, >to the required high voltage AC to run the lamp. The AC is >also at a high frequency, so there won’t be any flickering. > >If the monitor lights up for a second or two, and then goes >dark, that is the inverter shutting off. It means the >inverter thinks it is overloaded, and so it has shut off. >This can mean a failure of the inverter, or an actual >short somewhere in the wiring (like dust or dirt forming >a conductive path for the high voltage to flow). Sometimes >the connectors on the inverter are corroded and make an >unreliable connection. > >One test you could have tried, if you could still see the >monitor screen, is turn down the intensity setting of the >monitor. If you can do that, frequently the inverter will stay >running for a while longer. But it won’t last forever. > >This is really a shame for LCD monitors, because >everyone worries about the CCFL (the lamp itself) >and its 25000-35000 hour lifespan. But what seems >to happen instead, is problems with the inverter >mean never getting to see the lamp wear out. > >Inverters can be replaced - the hard part is finding >an exact substitute. There are companies on the >web that sell substitutes, but you never know how >close they are to functioning like the original. >I doubt any company sells the exact same module >as the one inside your LCD monitor right now. >If only the LCD monitor companies sold replacement >parts, or were required to by law. > > Paul Thanks for the info. Sorry I forgot to say more about my monitor. It’s a BENQ monitor, and the model is Q7T4. http://imagenes.solostocks.com/media/3/8/6/media_1418683.jpg So if the inverter is spoilt, does that mean I have to go and get a new monitor? One thing I forgot to mention is that the green lamp which indicates that there is signal from the computer remains on all the while even when the monitor does not show anything. And the monitor takes a longer time to go off when I leave the computer switched off for a long time. Could it be a problem of the graphics card? I’m using GeForce 8600. -- Posted at author's request, using moderated http://www.HardwareForumz.com interface Thread archive: http://www.HardwareForumz.com/Monitor-Suddenly-Doesn-Show-ftopict90857.html | ||||||||||
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