Question about Princeton Digital VL1918 Monitor

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Monitor comes on, then goes back off, rinse, repeat.

Ok... I turn my Princeton VL1918 LCD Monitor w/Built in speakers on when I start my machine, the picture loads, a small "clap" comes from the speakers, and the monitor goes blank. A day or two ago just I could just wait and the problem would stop after a few minutes. Now the last time I left it on it probably went on for about ten minutes... Could the backlight power inverter be going out?
Notes: I received this monitor from my Dad's girlfriend, who had been having separate problems with her computer and had just stored it all away in her garage. Also: I don't use the speakers built into the monitor, I have separate, more powerful speakers. I have been researching this issue and I think it has something to do with the power inverter for the backlight, because when the picture loads it looks just fine, before the monitor goes blank.

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  • cybergeek94 Jul 14, 2009

    I did try the flashlight test. I pointed the flashlight at several angles, from perpendicular to almost parallel to the screen... I couldn't see anything. Please update solutions accordingly so I may take the correct action.

  • cybergeek94 Jul 18, 2009

    Thank you for the great help. The symptoms I am having are exactly what they are for popped caps. I found the page for exactly my monitor, bought the correct caps, and my mom is taking it to her bf's this weekend so he can solder them in. Thanks much, guys. You've helped me extend the useful life of my monitor another few years. =D

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Well here is a test you can do. When the monitor goes black, take a flash light and hold at it a angle towards the monitor, if you can still faintly see the image then you have a blacklight/inverter issue. Another common issue with this is the capacitors on the inside. They will also cause this. If you dont see an image then the inverter will need replacing. As the steps for replacing all of this are quite long, ill post a few helpful tuts :).

For replacing the backlight:
http://www.inventgeek.com/Projects/shorts/overview.aspx
For checking/replacing bad capacitors:
http://www.wizardanswers.com/liquidvideorepair.html

I know these arent your monitor but its generally the same idea with all of them. If this doesnt work it will be a inverter issue and if it comes to that just let me know and ill be glad to help :D


Posted on Jul 14, 2009

  • Filidor
    Filidor Jul 15, 2009

    Alrighty looks like the power is the problem here. So with that lets talk about opening it up first. Most monitors now are held together by pressure tabs. Its tricky trying to get them to open but if you take something with a flat end, like a nice skinny flathead screwdriver it works quite well getting the two halfs apart. Just be sure not to hurt any components on the inside! Make sure you have all the screws removed from the shell as well. After that usually the parts are in a metal casing which is easy to get open (just more screws). Once you get these two open, look at the boards very carefully, looking for bad capacitors (they are bad when they are buldging at the top), burn marks, or other signs of damage. Sometimes it can still be as simple as replacing a cap. Go through these simple steps and if you see no signs of damage on caps and such ill tell you what you need to replace the inverters and how to do it. Remember this does take a bit of patience.

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