Question about Computer Monitors
My monitor comes on for a few second and then goes out, Turn monitor off and back on same problem (what is the problem).
I had a problem with my 1916w monitor where it came on and the monitor began to squeal, the screen went black and the noise stopped. The monitor power indicator whent from green to orange. It turned out to be two bad (domed) CapXon 1000 microfard 25v dc capacitors on the power board. This brand of capacitor has been a known cause of problems in various makers monitors. Replace these two capacitors and any others that have domed tops with a good brand of capacitor of the same rating. Replacing these two capacitors fixed my problem. I have disassembly instuctions for this monitor in answer to another persons problem in FixYa where he inquired how to get the covers off the monitor. Good luck and have a merry Christmas.
Posted on Dec 25, 2008
The problem is one or more failed electrolytic capacitors on the secondary side of the power supply circuit board.
You can often identify which one(s) (is/are) bad, because their tops often look "bulged", but replacing them all usually isn't a bad idea either.
Posted on Oct 31, 2008
I have the same problem on my Acer AL1711. The monitor was out of warranty so I opened it up and found one of the 1000 mf capacitor almost ready to pop. A 50 cents replacement from allelectronics.com fixed the problem.
Not recommended for anyone without experience soldering electronic components to PCB's.
Posted on Dec 29, 2008
Run a monitor aelf test.... Remove the monitor cable from the back of the tower... and see if it run self test.... also a install the driver for the monitor
Posted on Aug 03, 2009
The solution I am about to describe refers to a backlight problem, which is most common in Dell 15,17 & 19" monitors. The symptoms are as you describe:
Inside the monitor there is an inverter board that acts as a power supply for the monitor and the logic necessary to control the backlights (illumination and brightness control). There are four lighting tubes, which are controlled by two lighting circuits (two lighting tubes per circuit). At the heart of the inverter board is a chip that monitors feedback from the two lighting circuits and closes the back-light circuit down if either of the lighting circuits fail, thus any component failure will exhibit the same symptoms.
The transistors which fail most often cost pence to replace (types C5706 or C5707). However, their failure in unlikely to be the cause of the problem. My first crack at fixing this fault, by replacing the transistors, resulted in them failing again within 24/48Hrs. The cause of the problem will be dry solder joints or loose connections on the high-voltage side of the circuit, usually on the backlight transformer in the effected circuit. If you re solder each of the connectors on the transformer you will save the transistors from blowing again - the transformer generates 1,400Volts for the lighting tubes and at this voltage, arcing across the a dry solder joint, will quickly destroy the transistors again.
No soldering iron? - A complete inverter board replacement is also reasonably cheap and easy repair. These are widely available.
Sorry of this is more detail than you expected but it may help others reading this article.
Posted on Nov 28, 2010
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