Question about Princeton Digital VL1812 18.1" Flat Panel LCD Monitor

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Princeton VL1715-1 no display

LIght stays green when power button is pushed but there is no display on the screen even when I shine a flash light on it.

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From what you say there is probably not much you can do with it, the parts inside are SMD, to small
to work on. If you could still see txt on the screen when you shine your torch, it could be fixed by
replacing the back lighting PCB.

Hope this helps
Have a nice day.

Posted on Dec 22, 2008

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1 Answer

Describe your (VL1916) 19" LCD


Did you try this monitor with another PC and already verify that the VGA cable is OK.
Common problem with Princeton monitors are due to bad DC filter capacitors in the power supply board, see example here:

http://s807.photobucket.com/albums/yy352/budm/PRINCETON/

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The flashing green light and no display usually means that the backlight circuit has failed. You can verify this by shining a flashlight on the dark screen and see if there is an image. If there is an image, then the problem is the backlight circuit. Often the problem with the circuit is that the transistors burn out. There are sellers on ebay that sell repair parts kits to fix these monitors if you are handy or you can bring to to an electronic repair service to have it fixed.

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http://www.sonyrewards.com/en/home/base/?ref=http%3A//www.sony.com/index.php

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Same problem


Check the Inverter card Connector which goes to pannel,Next Panel to AD card signal Cabble,..

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I am not familiar with your particular model, but I do know what the problem is.
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Hope that helps =)

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1 Answer

Princeton Monitor VL1917 - No Power


This is the way how to examine what's wrong with your LCD monitors. After you turned your pc on, 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. This is because of the lamps inside screen. Some of them 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. Hope this help!! If anything I can help you with, feel free to let me know.
Thank you,

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Mar 08, 2008 | Princeton Digital VL1812 18.1" Flat Panel...

1 Answer

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IF there is no display even with a flashlight, the P/S board is malfunctioning. Bad capacitors or LCD driver board circuit. Mine did this and it was bad caps, 4 of 8 were bad and a burned out chip on the P/S board.

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Looks like one of your backlights is bad, first indication is the red or pink tint, replacement of the lamp is fairly easy. If one lamp is bad the inverter will not work. You can get a replacement lamp from Mouser electronics for about $12

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Try another power adaptor. Check the delivered voltage and go get a universal power adaptor that has a switched for varios voltages and a number of connectors. Simply match connector to the voltage switch.

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