Question about ViewSonic VA720 17" LCD Flat Panel Monitor

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Dark LCD screen. Very faint image.

ViewSonicVA720 flat screen monitor- dark screen when computer turned on. Image can be seen but very dark and faint. What's the problem?

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Internally it has a inverter board which go bad sometimes or due to heat sometimes get unpluged.So you will have to open it make sure when you do there is no power going to it.Look at the wires make sure they are snug and try again.
good Luck

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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I have lenovo g550...my screen flickers in every 5minutes...


Failing Inverter An inverter, typically found inside a laptop computer, consists of a small board, which has impregnated electronic circuits stamped on it. Inverters look like thin boards about the of two sticks of chewing gum. The inverter and its bulb control the intensity of the liquid crystal display, which lights the screen monitor. The computer can control the output voltage of the inverter and either lighten or darken the screen. A special type of inverter can adjust the brightness of the screen by using an internal sensor to judge the room brightness, and then adjust the screen accordingly. Failing inverters give off some specific warning signs, which can be recognized by observing different screen characteristics.

Short Intermittent Display Upon turning on the laptop, the screen flashes on in the normal mode for a short period and then blinks to black. A very faint image appears in a dark background, which will be very hard to see almost invisible. After shutting off the laptop and restarting, the same mode occurs, where the screen appears normal for a few seconds then fades to black. This condition points to a failed inverter. To confirm this, plug in an operational external monitor; if the external monitor functions, the inverter has failed. b> Total Blackout with Ghost image b> The laptop turns on, as indicated by the power supply button, but the screen comes up black. The screen comes up black after restart. You might be able to detect a very dim or ghost-like image on the monitor. When you plug in a known functioning external monitor, the external monitor operates normally. This mode of display indicates a failed inverter. b> Long Term Periodic Operation b> With this failure mode, the laptop screen illuminates normally upon start-up and remains that way after several minutes, hours or even days, until it goes very dark again. Brightness controls or restoration attempts do not work. Most often, the screen will function normally with a computer restart, but will eventually return to black. Faint ghost images might appear, as seen in the total blackout mode. b> Dark With Color Variation b> Upon computer start-up, the monitor shows black or dark gray, accompanied by very faint images. The screen might have an intermittent color change, or remain on with a non-standard color variation, like pink or red. b> Auto Control Switch b> If the screen appears black, with no faint or ghost images, look for the lid switch near the back hinge. The switch, when depressed with a closed lid, shuts off the computer and monitor functions. Sometimes the switch becomes stuck in the closed position, disallowing the computer and monitor to turn on when opened. Pushing the switch manually several times can often free it up. If the switch tab has broken or jammed inside the case, it needs replacing. b> Loose Connection In this mode, the display looks normal upon start-up, but tapping the side case of the computer turns the screen black. More tapping results in the screen functioning normally then cutting out again. This condition points to a loose wire connection from the inverter to the LCD backlight lamp, or the video cable. The connectors can be accessed by removing the monitor bezel screws and pulling the plastic retainer off. Both connectors can be cleaned and refitted.

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1 Answer

Can the lamp be replaced for a Polaroid TLX03210B


You likely have a LCD set there which may likely use a back light inside to light the image, get the room as dark as you can and with a flashlight illuminate the screen from a angle, with set on if you can see the faint image on the screen of the program you have a Backlight issue'

1. Voltage not there or not being switched on for backlight.

2. Actual back light bad.

If the image can be seen with a flashlight one of the above is the issue and your "picture will appear very faintly" also suggests this.

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No video or no brightness? If no brightness on a LCD get the room very very dark and with a flashlight on the screen look to see if a faint (very faint) image of the picture can be seen or not.

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If its LCD get the room very very dark and turn on--with a flashlight near the screen look closely at the screen to see if you see a very faint image of the picture or not---Most LCD flatscreen's (not Plasma) use what is called a back light to light the screen--light source.

If a faint picture can be seen that way the light is not on.

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How did you check the inverter?
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Buy a replacement (on eBay????) and install it.

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the inverter or the lcd bulb may be out. inverters are cheap, bulbs are not. is the screen dark like its off or glowing black? if its dark like the bulb is off, next, look closely and see if you can make out a faint image on the dark screen, if so, it is likely the inverter.

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1 Answer

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I had the same problem with the same monitor. You could see the image, but extremely faintly. In my case, the problem ended up being the inverter board (Delta DAC-12M033), which I found refurbished on Ebay for $45.00. Takes about 30 minutes and about 15 screws to replace, if you are handy in that department. Just my $0.02 worth. Hope that helps!

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If you can still faintly see data on your screen, it will be a faulty backlight in the panel most likely.

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