Question about Scanport 17" LCD Monitor

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Screen is on but picture dose not show... cables connected

If you look closely the image is visible but very dimmed.  if flashlight pressed against screen it lights up the picture better. Brightness and contrast were turned to max and did nothing.  Everything else works properly just screen is dimmed to the point were you have to (HEAVILY) strain your eyes to see.   

If any solutions please post.

(Picture below is with flashlight pressed up against screen.

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Solution, replace monitor with a new one.
I have found, at my shop, that getting parts for these things can be pricey and by the time I charge labor as well, could just buy a new one.
Probably a bad internal power supply or the inverter that powers the bulb(s) went out, which is sometimes built in with the power supply itself. If, and I stress IF, the parts are available, be prepared to pay more than its worth.
Pick up a new one, shop around on different brands. Some manufacturers offer 3 year warranties. ;)

Posted on Oct 24, 2007

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Posted on Jan 02, 2017

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My Emerson has no picture but has sound


Is this an LCD tv? You didn't include a model number so i can't really answer, but if its an LCD tv then try shining a flashlight on the screen at an angle, can you see what looks like an image on the screen with the flashlight? Its pretty common for the backlighting in a LCD to fail causing it to appear as if there is no picture but the picture is there just no lighting to make it visible. If there is still no picture with a flashlight up close looking at the screen it could be many things, failed capacitors in the power supply thats preventing the screen from coming on, a bad mainboard that the video failed but the audio still works, lots of options here.

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take a flashlight, turns on the tv and try to "see" the image while light up the flashlight against the screen , if you "see" something you have a bad back light inverter board.

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With the tv on press a bright flashlight against the screen. Look for a moving image around the flashlight. This show an image in getting to the screen. You need a back light to see it.
You need a new back light inverter board.


IF YOU KNOW HOW TO WORK WITH ELECTRONICS REPAIR(replace board ) or have a friend with knowledge/skill you can fix it.

You did not give a make and model of the set so I am not able to suggest a source.

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With the tv on place a bright flashlight against the screen. Look for moving image around the flashlight. This show an image is getting to the screen but you need a back light to see it.

For an LCD tv you need to replace the back light inverter board.
Since you did not give a make and model I can not help locate the board. You can do it.

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Check the monitor with a known-good cable. Look for bent pins in the connector to be safe. Next, have a bright flashlight handy. Dim or turn off the lights in the room. Turn on the flashlight and hold it very close to the screen. Look around the screen carefully and try to see a dim image in the display--if you can see the computer image, it means a problem exists with either the power supply section or, the actual display section. What is happening in this case is two(2) extemely thin, very bright, fluorescent tubes are failing to ignite. These tubes are usually laid top and bottom on the larger monitors, out of view by the user. Their light is transmitted through a series of specially designed plastic sheets which reflect against a shiny back sheet--this gives you the crisp, bright whites and colors in the image. Warning: if repairable, this is a very involved repair. Have purchasing a new monitor in the back of your mind if you send the unit out to a repair facility for a quote.--Just my thoughts--Rick

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You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

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All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
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IF the set is under warranty, you should return it.

Do this to see if your set is "sending" the image to the LCD panel.
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2) Look for the "image" moving around the edge of the flashlight.
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1 Answer

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This is the way how to examine where the problem is. If the screen is going dark. You have to check that you can see the image on screen by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons (Power on both cpu and monitor), there will be a minor problem. Like me, I can see window image using flashlight and check lamps inside. Some of them were broken. If you cannot see any icon on the screen. I would say that there are some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or dark spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so.

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