Question about Envision EN-7100e 17" Flat Panel LCD Monitor

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Envision 17" LCD display will not stay on

My relatively new Envision 17" LCD display will not stay on. It turns on and then, without displaying, turns off in about 5 seconds and repeats this process over and over. The CCFL backlight flickers just as the display is power cycling. I have isolated the problem to the power supply, which is internal to the monitor. By pulling the CCFL backlight power plugs I can get the monitor to turn on and off and stay on as expected (of course I can't see anything). THere are 2 CCFL tubes in the monitor and the power cycling happens with either one connected to the power supply. Since it's unlikely both tubes went bad at once, I suspect the power supply rather than the CCFL tubes. THe manufacturer wants more for the board than I paid for the monitor so it's either fix the power supply or dump the display. I've looked at a number of power supply boards on ebay and they all seem to have the same configuration with an inverter section for each CCFL - again, since my problem happens when either CCFL is connected, I am suspicious that the problem lies in the part of the power supply that controls the CCFL inverters. Anyone understand these things to the point they can offer some assistance?

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  • waymirjr Jan 25, 2008

    Hi I have the same problem. When the power button on the monitor is pushed the desktop is viewed for one second and then goes to black.

  • Anonymous Feb 01, 2008

    I have the same problem (as waymir jr.) "When the power button on the monitor is pushed the desktop is viewed for one second and then goes to black."

    I didn't realize until just now that this is a monitor problem and not a computer problem. I have been trying to fix the 'computer' problem forever with no luck. Everything on my monitor looked normal (green power LED on constantly, meaning that the monitor is getting signal from the video card and that the monitor power is on).

    When I powered up my computer, I would see the monitor's LED go from yellow to green, and on the monitor I would see the POST information for about 1 second, then disappear. I would keep 'resetting' (rebooting) the computer (thinking it's a computer problem) until the POST message would display for the correct amount of time, and then the Windows XP loading screen came up. After that it would be fine and I could use the computer/monitor. But I noticed that when the OS went to screensaver mode (after a few minutes of non-use) when I came back and moved the mouse, I would see the desktop (or whatever I was last doing) on the monitor for 1 second, and then the monitor would go blank. Then, if I shut the monitor off (by pressing the power button) and turned it on again, I would see the desktop again for 1 second and then the screen would go blank. I did this a few times and eventually the monitor stayed on and I could do work. At that point, I realized it was a monitor problem.

  • chris5555 Feb 01, 2008

    I have the same problem (as waymir jr.) "When the power button on the monitor is pushed the desktop is viewed for one second and then goes to black."



    I didn't realize until just now that this is a monitor problem and not
    a computer problem. I have been trying to fix the 'computer' problem
    forever with no luck. Everything on my monitor looked normal (green
    power LED on constantly, meaning that the monitor is getting signal
    from the video card and that the monitor power is on).



    When I powered up my computer, I would see the monitor's LED go from
    yellow to green, and on the monitor I would see the POST information
    for about 1 second, then disappear. I would keep 'resetting'
    (rebooting) the computer (thinking it's a computer problem) until the
    POST message would display for the correct amount of time, and then the
    Windows XP loading screen came up. After that it would be fine and I
    could use the computer/monitor. But I noticed that when the OS went to
    screensaver mode (after a few minutes of non-use) when I came back and
    moved the mouse, I would see the desktop (or whatever I was last doing)
    on the monitor for 1 second, and then the monitor would go blank. Then,
    if I shut the monitor off (by pressing the power button) and turned it
    on again, I would see the desktop again for 1 second and then the
    screen would go blank. I did this a few times and eventually the
    monitor stayed on and I could do work. At that point, I realized it was
    a monitor problem.

  • billjog Mar 04, 2008

    my monitor comes on but then immediately goes off. I suspect the innvertor but where can I get one? Bill G

  • healykp Aug 16, 2008

    My problem is identical. Backlight flashes on for a fraction of a second and repeats endlessly. I can hold a flashlight up to the display and I can see that it is still on between flashes! So, the entire unit is not cycling just the section powering the backlight inverter(s). I found 2 bad capacitors in the power supply and replaced them. No good. Any help would be appreciated. Thanx, KPH

  • tkkr Oct 07, 2008

    My monitor displays for 2 seconds and then goes dark. I power it off and back on and the dipsplay works for 2 seconds and goes dark. I plugged it into the second computer and the monitor did the same thing. For the 2 seconds the monitor displays a picture it looks great. What can the problem be?

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Seems the N-Channel MOSFET switch in the power supply is the culprit. NTE does not list a replacement part for this, so a sub is necessary (any N-Channel 600V MOSFET in same TO220F case should suffice). I have to look one up for mine.

Posted on Mar 25, 2009

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If this were my monitor, I would keep an eye on eBay for the same or similar model, except with a cracked screen or some drastic physical damage that would allow you to get the monitor really cheap, then cannibalize the power supply (provided the new one powers up okay). Definitely cheaper than ordering parts from a manufacturer.

Posted on Jun 21, 2006

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