What does the LCD's user manual say about a blinking power light? (When my Asus monitor is on standby/sleep then the light goes to steady amber from steady green.)
A significant number of reports regarding flashing power lights on Viewsonics with inability to "wake up" state that the cause is related to bad capacitors:
https://www.google.com/#q=Viewsonic+21'+LCD+power+light+blinking+what+is+the+meaning
Addendum
"drumerman" Wrote:
December 17, 2008 4:13:58 AM
just fixed my VX922 monitor ! woot... well at first my monitor was having the same problems as everyone else's here, it would work great then just occasionally poof no longer display, i run this monitor as an extension to my 24" so it wasn't a huge deal, i could get it working again if disable the monitor, shut down, waited and tried again, but then one day it just would not come back, no error message like no source connected just sit there blinking a green light and displaying nothing.. was pretty disappointing but thought I'd google around to see if it is fixable...
I found some sites for different monitors claiming that LCD's with these symptoms (no connection error but a active light) can be because of faulty capacitor(s), which would explain why the problem is so intermediate and frustratingly hard to pinpoint, until one of the bad cap's just completely fails and then the monitor won't come back. (if you care the problem is accelerated when ever the monitor has to change its resolution, this puts the caps through a cycle which may or may not succeed with swelled capacitors, if you have a monitor that is still in the in between stage try manually changing the res, your monitor will not want to come back until it resets after it loses power.)
** fix worked for me**
Anyway to fix it you gota crack open you monitor and replace your swallon capacitors (I had 6)
What I did ~
remove the black screws on the outside, pull the back plastic panel off use knife or something it has latches, now you have 4 metal screws that hold the main board that drives the LCD, take out those screws, unplug the connections (take pictures or something to remember orientation/place to plug them back!), flip the metal thingy over to revel the bottom of 2 PCB boards, unscrew both of them but the one you want is the bigger one, this one is the power board and it has a right angle connection to the smaller PCB board, you need to wiggle it out before you can free the power board. The smaller board has the connections to your dvi vga ports so it will not come out all the way, but you only need to move it to pull out the connectors to the bigger board. (try not to touch the board just the edges), now that the boards free look at your cap's, your looking for the tops of them to be bent outwards like they are gonna explode, if they look like this they are swollen and will not longer work correctly or sometimes at all... De-solder them carefully and solder in brand new matching cap's, make sure the polarization is correct, (long leg should go to the unshaded region, short leg with - marking goes to the shaded region on the PCB board). Put it all back and power it on! Worked for me and it cost less than $5 granted i already have solder and a soldering iron. Its very likely we have similarly failed caps so the ones that failed me were:
2 - 1000uF @ 10V
3 - 470uF @ 25V
1 - 470uF @ 10V
again this worked flawlessly for me, i can change the res to w/e and it just works, so hope it works for you! good luck
(oh ya my monitor was obviously out of warranty, if yours is still good have them fix it)
~David
Ref:
http://www.tomshardware.com/forum/2...onitor-black-screen-green-power-light-flashes
