The monitor turns off and on repeatedly.

It is almost certainly either the gas discharge tubes (flourescent backlights) for the screen, or the inverter (electonics) that powers the lights. Both of these components fail / wear with age, particularly in earlier screens.

I have been working on lcds for about two years now and what I find alots of problems is power supply...caps are often number one problem. I have repaired about 500 lcds with just replacing
caps in power supply....hope this help cyborg

I opened up and fixed a monitor just like this. The reason it only stays on for a second is because there are 4 or 5 bad capacitors on the power supply board that have over heated and gone bad due to cheap parts or poor ventilation. All I had to do was replace them and the monitor worked fine after that. Also i resoldered one joint on the bottom. While I dont reccomend the average home user to try this it is an extremely easy fix if you have the right tools.

I am an LCD repairer. The problem is power problem. If you remove the plastics from the back of LCD you will see two waffle boards. One is the power the other is the video. You will need to replaced the power (its yellow)

Got the same issue will post once I Fix it ;)

According to Samsung, the problem is that the monitor is going into and out of sleep mode. The recommend pressing a key on the keyboard and if that doesn't work, press the third button from the right in the bottom corner of the monitor, then press a key on the keyboard. Needless to say, none of that worked. It's not software because I've installed Samsung's drivers.

It must be the monitor. If I could just take it out of auto power save mode. My power scheme in Windows is to NOT power off the monitor when it's plugged in.

I've tried it on a computer that has SyncMaster 740 N attached and I've got the exact same problem.

Kill the auto power save mode and I'm sure it would work fine. But I don't know how to do that.

i have the same problem with MY monitor which just happens to be the 19" screen. ive also noticed that the green light on the power button keeps blinking. if i just disconnect the video input the monitor actualy stars on and shows the xerox screen and the proceeds to searh for an imput n then goes to sleep as usual. plug in the video in, and it power cycles. verified the cord and the source as normal so the problem is definately the monitor. the question is, wwhats the problem

I agree with the other solution poster. My en-9110 is doing the same thing and the light on the power brick is cycling on/off with the display. Contact Envision for an RMA if the monitor is still under warranty, if not you can get a cheap power brick off ebay. I would buy an OEM type one though and not a universal one.

another site I found on google said it was bad solder joints causing the problem. I have an aoc (envision) lm729 ,that is under warranty. so i got rma and sent it in. this monitor went from staying on and going off to just staying on for 10 seconds and going off untill you turned it off and back on, then you had another 10 seconds. if you google it ,a guy has a web page with pics on a diy repair. but use extreme caution when opening any monitor, high voltage is present, and mercury gas in lcd monitors. is best left to a service tech with monitor / television experience. safer to buy a new one, then end up in the emergency room or worse. and cheaper than the er. most stores now have an extended warranty option ,so all you have to do is carry it in for free replacement of one of equal value.

Hi this is the way how to examine what's wrong with your LCD monitors. Power on both CPU and monitor. After it turned off, you have to check if you can see the image on the screen or not by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons or any image, there will be a minor problem. Like me, I can see window image using flashlight and check lamps inside. Some of them were broken and it is easily replaced. If you cannot see anything on the screen, there'll be some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or burn spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so.

I'm having the same problem and I know it isn't any of the other's above. The computer is hooked to a KVM and there are 11 other machines using the exact same monitor (I'm typing on it now) without issue. More still, the monitor was working some 15 minutes ago and I can't figure out anything that's changed except the mouse started spontaniously working on a completly different computer. I'm thinking it's maybe a software problem.

Sony has seen this before. Model SDM-HS73. Here is there advise for this problem.
==============================================
The LCD turns itself off and on every few minutes or seconds.
function lno1() {}
lno1()
If the LCD takes several minutes to turn on, or turns itself off and on every few minutes or seconds, perform the following procedure to troubleshoot the issue:

1. Ensure the power cord is connected to a known working outlet.
2. Verify that the detachable interface cable is securely connected to both the computer and the display.
3. If available, connect another display to the computer to confirm the computer is operating properly.
4. Use a different interface cable to connect the display to the computer.

If the issue is still unresolved, service may be required. The Sony® eService Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer.
=============================================
This did not resolve the problem with my monitor.

Oh my goodness! I was ready to chuck my other monitor out because of the on then off after a few seconds (faulty thing) - when I came across one of the posts earlier.

All I had to do was to push the "Auto" button twice and now it's back to normal.

Thanks to the guy who posted the solution. Thought I'd post it again here in case someone else is having the same problem.

Saves me buying another monitor! Whoohoo!

this is probobly a problem with the power supply. check computer with another monitor in prder to determine which unit causes the problem. lots of electonic devices got a high-voultage defence system, which shuts them off when they receive too much power. my guess is the mechanism in charge of adjusting power level to monitor got screwed up for some reason.

I had the same problem and found that my power supply got mixed up with another. I found a bigger power supply and it fixed the problem.

i have a lg 1920p that does the same thing.finally got mad and took it apart and found that the plasma or whatever liquid was seeping out from the bottom of the screen which in turn shorted out the board that has all the control buttons on it. disconnected the board and it works fine minus the control buttons.

LCD's often have problems with the inverters burning out. Using a bright light source, look at the monitor from different angles. If you can see the image in the screen, either your Florescent light is burned out or your inverters that run the lights are bad. Both are replaceable.

Why does everyone assume it's a hardware problem. I have no electrical knowledge or money to repair, buy new, or replace parts for my monitor. Give me more possible software solutions. I think this has something to do with "Auto-adjustment"
Because if I cycle my power button off for 5-10 seconds the monitor works perfectly, but if I cycle it quickly, only allowing it to stay off for 1-2 seconds, it says 'auto adjustment in progress' and turns itself off again.
Why is this? My computer screen stays black whenever I reset my computer unless I cycle it's power button, which annoys me because I just spent the last month tweaking my computer to boot up as quickly as possible, in about 15-20 seconds and all my system is using an old a7v600 1293 mhz motherboard/chipset which is like a decade or more old... so I was proud. Now I can't even see when my computer is restarted and I have to wait an extra 10 seconds to mess with my moniter, Totally wrecked all my work.
thanks.

we have a dell doing the same thing. changed monitors, still the same. when it first comes back after being black, the cpu monitor for usage is pegged. The explorer.exe is the process that is spiking.

could this be simply "heat" not being able to circulate air thru the side slots of the outer case of the monitor?

yeah open it up and look around for bad caps or any other signs of problems hint hint im sure you will see

My En-7100si monitor doing the same thing...has turn off and on several times the monitor-at least 4x- to make it to work-after turnig the computer off for 1/2 an hour or from stanby mode. It works no problem after. I have't done anything yet rather than inspections of connectors. I'll dig it probably later after work.

Ignore solution #8. It is complete nonsense. 

I keep on getting the contrast bar and evertime I press exit it comes up again. Basically I cannot get ride of the contrast bar in the middle of the screen. It' slike the down button is being pressed all the time! Also if I stitch off the monitor it takes ages to put it on again. (bulullu@hotmail.com)

I see the problem is some burned parts on the circuit board. If someone who can find the repair manual and replace these parts, the problem should be fixed.
huizhang78@hotmail.com

I Had The Same problem With my iiyama E481S. it Kept Switching off then switched its self back on if u left it long enough till the other week when it wouldnt switch on at all. After a few hours of checking insife i found there was a dry joint on power PCB. So Re-solderd its (was L101 on mine) and works fine again....

There are 4 identical transistors in the backlight circuit of these monitors (C5707 or cross-reference to NTE2668, about $3 each) which are prone to failure. They can be replaced by anyone with basic electronics knowledge and soldering skills. Also if your monitor has failed to the point where it doesn't try to light the backlight at all, the failed transistor may have blown a pico-fuse in the power supply circuit. These are labelled on the board as "PF"

check for some dry joints in the primary section of psu especially on the main filtering capacitor and on chopper transformer

I have a 19" HP f1905e LCD monitor. Twice recently, my PC failed to boot - it automatically tried rebooting (successfully) and told me my monitor was the problem.
Went to MSFT: there was an upgrade driver. Downloaded and installed it. Henceforth, the power saver kicked on every 2 seconds, regardless of key use or mouse movements. Finally caught it in a stable condition, and restored to a period prior to the upgraded driver (getting rid of it). Suddenly - all is well and working perfectly again!
Go figure.....

replace 1000 ufr capiciters

This didnt work for me. I unplugged the monitor power cable and put into another power outlet, but it still keeps on doing the same thing.

Hi, My l1lcd2 17 in. Flat Monitor has a problem.

The Blue on led comes on and then it goes to amber and the blue led comes back on and the screen shows the first page for just a moment and pops off. and contiues to repeat this on and off. This happens very fast.I tried other computers with no luck.

Please advise. Seapple@bellsouth .net
Thank you, Sheldon Apple Merritt isl. fl.