Following the suggestions, I took the monitor apart and was fully prepared to replace transistors, capacitors or whatever but I can't tell which ones to replace. There's nothing that looks "obvious." I took a few pictures and was wondering if someone might notice something that jumps out.
Incidentally, my monitor is about 4 years old (one year PAST the warranty...GRRRR). I did try hooking the monitor up to another computer and it does the same thing (goes out after about 2 seconds). I tried the flashlight test but couldn't see anything.
Honestly, I 'm getting ready to throw the darn thing out the window and go to Wal-Mart to buy another one as someone else suggested.
In last two weeks, sometimes when I turn computer on the monitor is just a black screen and it flashes in time with the on off button. Sometimes it will come on and do fine. Sometimes it goes off while I am in the middle of something. Sometimes I can shake the monitor a bit and picture will re-appear. It is getting very annoying. It is 4 months out of warranty. I am thinking I may need to buy a new one.
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Re: Dell monitor keeps turning off...
Hello, The problem you are experiencing is quite common, however the solution can be expensive and frustrating if you are not sure what you are doing. The problem is due to usually 1 of 2 things but the result is the same. The result is that the H.O.T. (Horizontal Output Transistor) is blown or severely damaged and needs to be replaced along with the item that caused it to go bad to begin with. Note: sometimes just the H.O.T. transistor can be replaced and it will work ok (this is rare and due to just being over-used).
The problems that caused the original issue is either the H.O.T. Transformer (a black device with heavy red wire insulation going between the mainboard and the picture tube with a wide boot on it). The other main culprit is the picture tube itself that will internally arc between the pins on the end of it.
These devices develops internal shorts that wipe out the H.O.T. transistor which is mounted to a heat sink.
None of your pictures show this board (it appears to be the same 2 boards in different poses). In your case it sounds like the picture tube is at fault and not worth repairing.
One other possibility is just poor soldering on the main board but this is extremely rare fault.
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Hey i just signed up and found another solution that describes the same problem Apparently its due to faulty capacitors. You'll need to have it repaired. I suggest sending it back wherever the dell it came from if replacement is still covered.
I just had this same problem recently. As a computer tech I prefer fixing other peoples computers and NOT mine. Your case may be similar to mine. If you have a good monitor you will be hoping that it isnt similar to mine.
Ok the short of it is either your monitor is bad or your video card is bad.
First lets make sure we have covered the DOH items. These include making sure the video cable is plugged in all the way on both ends. Also make sure the video card has stayed seated in its slot on the motherboard. If Video card is integrated then this wont even be a possibility.
Now take a known good monitor and swap it in. If you are like me you appreciate as big a monitor as you can get and hopefully you still have an old small one hanging around. If you dont have you you may need to borrow one from a friend or work. If the known good monitor works then your monitor has gone bad. It happens all the time. I have a stack of dead LCD monitors. some can be fixed and some cant.
You can also take your monitor to work to test it with known good computers.
Keep in mind that if the monitors are different sizes you will need to make sure the computer is shut off before plugging the monitor in. The system reads info from the monitor to make sure the resolution can be handled during boot.
Your symptoms generally mean the video card is not working. The monitor light goes orange because it is not getting a signal. That signal can be interrupted in the monitor as well though. Testing will tell you which it is.
I have a similar switch on mine, although mine is a Gateway. So my solution is going to assume the same indicators and functionality.
On mine, a blue-violet power switch indicates it is off, red indicates standby mode, and blue to indicate it is on and/or searching for a signal. When turned on (blue), the monitor will go to standby mode (red) after 3 to 4 seconds if it does not detect a source signal. So if you toggle the power switch to blue and it soon changes to red, you'll need to check your signal, cable, or possibly for a bad source connection on the monitor.
Hi! I used to have a monitor similar to yours, from the noise you are describing is it like a crack? or an high voltage electrical spark/arc? (Mini lightening flash sound). The Monitor I had De-gaussed each time it was switched on this is a weird thing that lines up the colour guns. If done whilst in use it gives the brief appearance of a shimmy/shake to the screen. Have you a menu bar on or near the power on/ off switch? if you do try looking for De-gausse it may inadvertently become switched on to auto. You can De-gausse manually. I do hope this helps. Paul 'W' Onyer~EDson(:0)~[><U.K.
I got this from the website at Dell. It looks like the cord you want is the second one. I'm basing this on the fact that normal operating wattage is 55w with a max of 74w and that would describe your second cord. The first one wold provide too much power.
VESA Modes Horizontal Sync Vertical Sync Video Power Indicator Power Consumption
74 W (maximum)* 55 W (normal)**
Less than 3 W
Less than 1 W(at 110 Va)
From your description your backlight is going out. The fluorescent light when it begins to burn out tries to draw too much power. Your inverter is sensing this 'too much' power draw and shuts down power to the back light. Replacing the backlight is the most technically difficult repair of an LCD, and most repair shops don't even offer this service. I recommend that you sell your LCD 'AS IS' on eBay or a similar website. The Power board and the Control Board are both usable parts that can be easily salvaged from most Dell Ultrasharp monitors.
I have a similar problem, except if you look very closely, from an upwards angle, it isn't off, but on the darkest contrast setting. The Dell monitor that I am using has 4 buttons in the bottom right corner. The first is silver, the second is silver with a - on it, the third has a +, the fourth is larger than the rest and is the power button. If you press the first button, the menu will pop up. Then press the third button (the +) to go down to 'factory settings'. after that, press the blank menu button again, then the + to go down to 'all settings,' followed by the menu button again to confirm. To recap, press the first, third, first, third, first and it should fix your settings. This may only happen temporarily, and it may go black again. If it works at all, then it is the contrast getting out of whack and not the monitor shutting off at all.
You might want to check the refresh rate in your advanced settings under display properites.
Under Windows it shouls be something like:
Start Button > Settings > Control Panel > Display
Then click on the Settings tab, and on that screen click Advanced
On that screen, click on the Adapter tab.
At that point, make sure the adapter listed matches yours, and refresh rate should probably set to adapter default.
Hope that helps.