Question about Princeton Digital VL1918 Monitor

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Vl1918 it poweres on and shuts off.repeat

I have a VL 1918 Princeton monitor that is malfunctioning. The symptoms are: it powers on and off continuously with a 'clap sound right before turning off. I have taken it apart and there is a hissing noise coming from one of the transistors or one of the other things ,for which, I do not know the names.The hiss is hard to hear and track and could be normal. Yes I am shooting around but, I would really like to fix it. I also know it is an older monitor I guess but, I would still like to try. It also is not under warranty. I am fairly handy and have always wanted to figure something like this out. Any directives as intricate and seemingly advanced as they may be I will research and try to execute. Thank you very much Same monitor, same problem. What to do?

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  • waikoloahand Aug 19, 2008

    Same exact symtons. I'm going to try replacing the caps as since the monitors been sitting by the trash to be taken out anyway I'll only be investing a little time.

  • waikoloahand Aug 26, 2008

    I replaced the three 470mfd caps and the monitor is working like new. I had to pay $1.39 apiece for my caps at Radio Shack try buying components in Hawaii sometime.

    Thanks TODDG

  • Pestvic Oct 20, 2008

    I really hope people still read this... i have the same turn on. wait half a second. then turn off. repeatedly problem, but like NoResults said. i only have TWO (470uf 25v) capacitors on the power supply board, both looked kinda normal. not sure if they are bulged but i did notice some browning of the motherboard under where a square looking piece is, part # s5303-3602-01 LSE IOU218A 050 44s.PLEASE HELP if you need pictures of the capacitors to check if they are buldged or a pic of the browning please let me know a.s.a.p.

  • The Pearl Nov 18, 2008

    The monitor continues to cycle through on/off cycles. Stops after 20 minutes or so. Get a 'pop' sound when cycling off.

  • Anonymous Feb 06, 2009

    screen keeps flashing on and off with a noise each time it does it

  • Pestvic May 11, 2010

    so this will work with the vl1918? ill definately look into those caps. and if it works ill so happy :)



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I have 1500 Princeston monitors in my labs.
the 1700 series need a high rated cap. the company used Caps that could not react to constant on off abuse.
The 19s are about the same If you only have two caps.
the Larger cap is25V at 1000uf replace with a higher grade cap at 1000mF at 25Volts
the smaller of the two is 1000uF at 10 V
replaced again with a higher grade Cap vauled at 1000mF at 10Volts.
Belive me after 300 of these it's the caps. if they are buldging or not.
If you have a VL2018w the kind I just repaired today and one that i am using at this very moment.
It uses 4 caps on an a seperate inverter board. all four must be replaced. and use the good stuff.
all four are 1000mF at 10volts.I use Nichicon Capacitors only.About 3.50 for the average joe.
I get them for .45 but I buy like 1000 at a time.
I just repaired 4 1708's and will be repairing 11 of them tomorow.
Like I've said when they work, they work well and we keep ours on 24/7/365.
for the money I'd go with a Philips 17" or 19" they make them better than thier plasma TV's.
Hope this helped.

Posted on Nov 07, 2008

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No sound coming from my Princeton VL1918: in trying everything I know (new drivers, new BIOS, etc etc) I got 2 notes out of it from a music CD b efore it went silent. I know this line has undersized capacitors: are they part of the music problem? Thanks

Posted on Apr 09, 2011

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First of all I'm not an electronics guy at all. I had a Philips 170S5B/27 monitor (3 actually for a triple monitor setup.) One was taking longer and longer to come on. So I was watching a eBay auction for another one for $70 ending in 90 min. Read on here about replacing the caps. Found 9, 470uf 25vt caps on the power bd with some bulging. (I think thats what it is) Radio Shack had 8, 470uf but 35vt ones. My Dad thought it would probably be ok to use them. (???) Replaced them and couldnt believe I got the monitor working like new 5 min before the auction ended! So I let it go. Only cost me $11. So thanks!!!

PS. Is this problem because of turning it on and off? I only use it a few times a week and for just a few hours ( so I figured I'd save energy and life by turning them off. Should I leave them on all the time?

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

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SOURCE: vl1918 it poweres on and shuts off.repeat

My VL1918 does the same- pings like a submarine and flashes on and off. I got the three 470uF 25V caps and replaced them-- in about 45 minutes my monitor was working again. I figured I had nothing to loose, it was going in the trash so I gave it a shot.

Looks like the caps are in the power supply- many monitors have an external power supply- would have been a smart move in this case. anyway this was a fairly easy fix- the caps I bought cost 39 cents each.

Posted on Jan 08, 2008

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SOURCE: vl1918 it poweres on and shuts off.repeat

You need to replace the "buldging" capacitors as that is a sign that they are bad. Go to Radio Shack & they can hook U up with the parts. Here's a good example of how to do it, and I have to say that I followed these steps & now mine works:

Posted on Nov 30, 2008

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1 Answer

My VL 1918 is blinking on and off constantly

It does the same when used with another PC?
Otherwise, look for bad caps, transistors, transformers as shown in my pictures here:!cpZZ1QQtppZZ20

Very common problem as you can see.

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.
Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

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You can't change the image size as such actually on the monitor but you can change the size of the image feeding the monitor.
In windows right click the desktop, click properties in drop down menu then click settings.The setting should correspond with the native setting of the monitor which is 1280x1024 pixels and that is what you should set it to.
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

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Vl1918 it poweres on and shuts off.repeat

You need to replace the "buldging" capacitors as that is a sign that they are bad. Go to Radio Shack & they can hook U up with the parts. Here's a good example of how to do it, and I have to say that I followed these steps & now mine works:

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18 Answers

Vl1918 it poweres on and shuts off.repeat

Just another voice to say that the solution provided here by others does indeed work.

Had same symptoms: screen comes on for about a second, a metallic popping sound occurs, screen shuts off for about a second, repeat. Problem occurs even if monitor is not plugged into computer (thus isolating it to monitor). Monitor purchased from Costco approximately two years ago.

Found 3 suitable 470uF 35V capacitors at the local Radio Shack for a little over $4 (more pricy than online, but no shipping cost, so it's a wash) Entire repair took less than 30 minutes.

The repair itself is already covered pretty well by others here, so I'll just add some disassembly instructions:

Set the monitor face down on a towel to protect screen. Remove 4 Phillips screws securing base to back of monitor, set base aside. Remove 3 Phillips screws from bottom edge of monitor cover. With flat screwdriver carefully pry along the other 3 edges to disengage the catches (about 3 per edge). Remove back cover. Identify the raised metal shroud containing the power supply module at center. Carefully lift one side of each piece of foil tape to expose connectors (for the short pieces of tape it's easier to remove the side that's laying flat, for the long piece at the top of the monitor, it's easier to remove the side that's vertical on the power module). Disconnect all cables, noting how to replace them later. Remove 4 Phillips screws securing the power module. Remove the power module and set the rest of the monitor aside. Flip the power module over, orient it such that the plastic covering is on the left (done only so that these instructions make sense). Carefully pull up the plastic cover from the right circuit board near the center of the power module, you can leave it attached to the metal shroud at the left side (it is difficult to remove from the metal without damaging it). Gently bend (without crimping) the plastic back and out of the way and remove the 4 Phillips screws securing the left circuit board (the one with the power connector). You will need a small "jeweler's" screwdriver for one of the screws - make note where that screw goes (top right of circuit board, or top center of overall module, when oriented as I did). Slightly tilt the left side of the circuit board up, and slide the circuit board out and to the left, over the bent back plastic, disengaging a connector from the neighboring board.

Then perform repair, and reassemble in reverse order.

Thanks to all who posted the original solution!!

Nov 15, 2007 | Princeton Digital VL1918 Monitor

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