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Screen flickers and goes dark u can see the image if u shine a flashlight on it. what could be the problem ?

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  • Toshiba Master
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There are a couple of Cold Cathode Fluorescent Lamp tubes behind the screen. They have probably reached the end of life. (If you had no flickering, I would suspect a failed inverter.)

Replacement requires disassembling the display housing, then removing a screw from the side of the display next to where the fat pink and white wires go in. On most displays, you can then slide the tubes and their reflector out of the display by pulling on the wires. Be very careful - the CCFL tubes are long, skinny, and very fragile, and they contain mercury. Tubes usually come bare, with short wire leads at each end. Soldering the old wires onto the new tubes is a delicate task best reserved for experts. Alternatively, you can buy replacement tubes with wires already attached for an extra $8 each. See this tech support link at LCD Parts for more details.

Posted on Mar 11, 2011

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It sounds like your LCD Backlight has burned out. You will most likely need to replace your LCD Screen, since you can still see a faint image.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Posted on Mar 11, 2011

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Posted on Jan 02, 2017

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Hi this is the way how to examine what's wrong with your LCD monitors. Power on both CPU and monitor. After it goes back to white, you have to check that if you can see the image on the screen or not 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 or any image, there will be a minor problem. I used to check my LCD monitor and could see window image using flashlight and found out that Some of CCFL lamps inside were broken and it is very easy to replace. If you cannot see anything on the screen, there'll be 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 burn 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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