Question about Princeton Digital VL1812 18.1" Flat Panel LCD Monitor

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Monitor will not display

My Princeton Model VL1812 will not display when I boot up computer. The green power light is on. If I turn the monitor off with the monitor power button the CPU beeps continuiously.

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  • rpmedina1 Aug 13, 2008

    My Princeton model V1812 has an unlit screen. The power on light goes on and off at a regular rate, whether you push the button or not. I suspect a power supply problem. However, I cannot open the monitor up to view the inside. There are four screws, one at each corner, but the two halves will not separate even with all four screws removed. Does anyone have a tip for opening it up without damaging the case?

  • Anonymous Sep 15, 2008

    My Princeton model V1812 has an unlit screen. The power on light goes on and off at a regular rate, whether you push the button or not. I suspect a power supply problem. However, I cannot open the monitor up to view the inside.

  • Anonymous Sep 28, 2008

    Same issue - Screen would not come on, electronics appears to work(green light on), top of the screen seem to have some yellow back light. Remove 4 screews, black cover does come off (watch that the black cord is not holding it on). You might remove the screws in the base (through oblong hole in base), then remove base 4 screws through mount - these don't appear to be holding anything but made it easier to remove black back (also note black back pulls away from silver front - not the other way around - pull from bottom center of black frame)

  • Anonymous Sep 28, 2008

    As to the real issue - screen does not come on. Nothing obvious to fix. I was hoping there was something obvious that could be exchanged to test out as I have 2 of these monitors with one still working. But allas we live in a throw-away society (and new 22" screens go for about $280 these days makes it hard to spend a lot of time salvaging something small with lower resolution. Good Luck!

  • Anonymous Sep 28, 2008

    Ok That fixed it! Bad power supply - I now have the other montior working. Just swapped the power supply (real easy - just 4 screws and the two easy clip connectors - one from the Power cord, the other to the main electronics / controller board)

  • bdeluke Sep 30, 2008

    won't display

  • Anonymous Oct 02, 2008

    Ok - Found the issue in the Power Supply - component I801 Bad Power Switcher (4 pin w/FET on the large heat sink above the large Capacitor on the board). The PN is a Fairchild 1M0565R which I purchased online at for 4.99 each.

  • Anonymous Oct 05, 2008

    I had a similar issue after I pushed the brightness up, evidently too far - screen when blank and stayed blank - I had to lower the brightness "blind". so try this - turn off and on the monitor (reset) hit button 1 (far left button), a menu is displayed even if you can't see it. Hit button 4 (the right most in the group of 4) twice - selects brightness, hit button 2 a bunch of times to reduce brightness. Hit button 1 twice to exit (2 menus) power off and on and see if that helps.

  • jlvb1 Sep 23, 2009

    How do you take the back off of a Princeton VL1812 LCD?



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Hello, tech support online at Sony was able to help me correct the problems.

Posted on Mar 09, 2008


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