Having problems with your Princeton Digital VL1918 Monitor ?

Vl1918 it poweres on and shuts off.repeat

\015 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\015

Answers :

Just another voice to say that the solution provided here by others does indeed work.
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\015\012Had 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.
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\015\012Found 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.
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\015\012The repair itself is already covered pretty well by others here, so I'll just add some disassembly instructions:
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\015\012Set 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.
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\015\012Then perform repair, and reassemble in reverse order.
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\015\012Thanks to all who posted the original solution!!
Had the same problem with mine, on and off making sound.Read other blogs and pulled it apart, found the three caps on the pwr supply. Pulled out pwr supply, ran down to local electronic store picked up new ones, I got 470uf 35v caps, went home and repaired it in 30 min..Back up and working like new for $5.00
\015\012Just note when taking out bad caps and installing new ones you pay close attention to the pos and neg markings on the caps, they must go in the right way....
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