Question about NEC AccuSync LCD71VM 17" LCD Monitor

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After three seconds power it on the back light goes off. At this point if the display is turned off and on again, the image gets back and gets dark again after three seconds

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There seems to be bad solder connections either on the power supply or the inverter Board. You may even have a bad capacitor on the power supply board. When caps go bad sometimes the yswell at the top of them, if you take off the back cover look for swollen capacitors in the power supply. The inverter board has small inverter transformers on it, check for bad connections on it, caution tho this board has high voltage on it. One good way to check the inverter board is while you have the back off. Darken the room as much as possible, even total darkness is good and turn on the monitor while looking at the inverter board for small arching or sparks, if you see any then this is your problem area.

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

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This is your back light on your lcd display, To prove that have a flash light handy when it goes dark point the flash light at the screen and you should see the screen and that would mean right there you got a back light going out or the inverter that powers it is going bad. Etherway if this is not your area of work you need to tech it to a computer tech local to have it repaired.

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Dell ADAMO 13 w/Vista 64 Random power failure...goes dead in 1 second. Battery fully charged. Happened with external power and when on battery. I have latest BIOS v6.0. I ran pre-boot diagnostics...


If the power totally fails (i.e. power is cut off, LEDs turn off, fans stop, ... etc), then this more likely to be because of a short circuit developing in a failing semiconductor component, or a power supply problem.
However, if the laptop is still running & only the display on its LCD is cut off but the laptop itself stays powered on, then your laptop might be experiencing a failing screen inverter board, a failing screen backlight lamp, or a failing LCD screen cable.

TYPICAL INVERTER FAILURE SYMPTOMS

1. When you turn on the laptop, the screen lights up for a short period of time and then goes dark. You still can see an image but it is very dark, almost invisible and definitely not usable. When you restart the laptop, the screen lights up and then goes dark again. The laptop works fine with an external monitor.
2. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline. The laptop works fine with an external monitor.
3. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again.

Inverter failure symptoms are very similar to backlight lamp failure symptoms and in most cases you cannot tell which one is causing the problem until you replace either the inverter board or the backlight lamp. From my personal experience, inverter boards fail more often than backlight lamps. If you have to guess, replace the inverter first.

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buy a new battery for the laptop...

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You need to verify if it's the monitor or computer--if possible, change out the monitor with a known-good one and see if the problem still exists. If it does, then it's a problem with the video card or driver software--if it doesn't and the monitor is an LCD display, then you probably have a failing power supply or display. In an LCD monitor, there are thin, bright fluorescent tubes which give back lighting to your image. A classic symptom of the screen going dark(with the image still visible using a bright flashlight), is the power supply that feeds the tubes or the tubes themselves. If the display is not under warranty, keep "new monitor" in the back of your mind because the cost of getting the unit fixed(if it can be done) rivals the price of a new one.--Hope I was of assistance--Rick

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The power -inverter board probably needs an overhaul.
I redo many of these.
If the screen was pinkish or flickering before it finally got to this point, it is possible that a bulb has gone bad.
Fran

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The LCD screen may be burned out. There's whats called an invertor board and there is an electronic ribbon strip on the LCD itself. If you look very carefully you can probably see a faint image on the screen. The LCD screen will need replacing. Before doing anything with this monitor, try it on another computer first and if you can try another monitor on your computer. Other than that, there really is nothing you can do but replace the monitor.

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