I have a ~6 years old Dell ST2420L monitor, which has suddenly started showing this weird behavior: it will shut off completely after 3-4 mins of continued use - even the LED power indicator at the base goes off. Then it will come back again after ~7-8 mins, and then stays on again for ~3-4 mins. From this, it sounds similar to this thread [http://en.community.dell.com/support-forums/peripherals/f/3529/t/19505287], however in this case, if I only connect the power cable, I do not seem to have a problem - the monitor stays on. Also, after the monitor shuts off, if I power cycle with some gap ~20 secs, it again start working, at least for the next 3-4 mins. Can the experts here have some suggestions about what is going on here, and what can be done to fix this? Can this be a driver issue?
Bummer time to replace it power supply is bad or when it gets hot it will shut off. I had a monitor that would come on and go off within one minute. the montor was bad
SOURCE: HP mx705 17 in.CRT Conventional Monitor vertical goes bad
it seems that youre monitor has a dry solder problem, try tapping it if the picture resumes to normal for a while than get it resoldered from a technician. if it soesnot solve problem than look out for a burnt resistance.
SOURCE: 52" Samsung DLP
It is unlikely that you can do anything yourself.
It sounds to me that there is a power supply problem that has steadily gotten worse and that cannot be confirmed remotely, it must be done on site by an equipped professional.
SOURCE: Dell Optiplex gx280 shuts down and orange power light blinks
It happens because the power supply is overheats and computer goes to standby. The power supply is 160w or lower. Specially it will happen if you put more devices in such as video card or sound card. So the only solution you have is to place a small 1or2 fans toward the power supply to make it cooler. And 1 more thing the power for the fans should come from other sources.
SOURCE: Magnavox 50" plasma Won't Power on/Shut's off/Blinking red LED
The above fix, listed by Tom saved us!! We did as instructed and took off the back of our 50 inch Magnavox plasma tv. We were not sure what we were looking for so we googled capacitator (image) & there was a photo of a fried capacitator! Sure enough we noticed ours were "fried", we took out the board and went to an electronic supply store, bought the 2 capacitators ($2.00 each!!) and then found someone who did tv repair to sauter the new capacitators onto the board. (It is important someone who know how to sauter and recognizes polarity do do this for you) All in all we fixed this following the above instructions for $34.00 and our time. For a month we were told to spend hundreds getting a new power board!
Kudos to you Tom & thanks so much!!
SOURCE: Dell E173FP Monitor Problem
My Dell E173FPc exhibited this same problem as described by many people on this site. Having looked through the solutions I decided to investigate further.
Posted solutions point to a faulty 12V smoothing capacitor, dry joints on the inverter transformer or faulty driver transistors. All these were Ok in my case, but on closer inspection a dry joint was found on L202 – see picture.
Cleaning off the old solder and re-soldering fixed the problem.
So if your monitor exhibits the same symptoms carefully inspect all the solder joints of large components around the inverter.
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