I turn on the computer and the icons show, then they go black. I turn on the monitor and briefly it shows them again. Is it in a sleep mode, did I hit a button? It was working perfectly before that. I tried a new cable from the monitor to the tower but didn't affect it so returned it. Any suggestions????
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Re: monitor goes black but shows icons...
I'll assume this is an LCD panel screen.
If what you are saying is the screen shows up and then goes dim or starts dim, and you can see a dark image of the system starting up and then displaying Windows...
Your problem is a bad CCFL (Cold Cathode Fluorescent Lamp) at the top of the LCD panel.
If the screen is totally blank, then it may be the power inverter.
You can find many websites that sell these parts, but make sure you have the right model.
If you feel comfortable with working on computers, you can replace this part yourself. Otherwise, you may want to pay a technician to do it. Make sure to get a fixed price quote before authorizing the work
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This is usually an issue with a failing capacitor. I replace them in mine often. In the monitor, on the power supply will be several capacitors (caps). Look for the tops to be domed these are bad. Try a site called badcaps if you are game to replace these.
A soldering station after shipping can be as low as $32 or so.
Does your monitor go black because it went to sleep, does it turn off? Do you have any lights on the monitor to indicate what it is doing?
Also I would boot into safe made by rebooting the computer & tapping F8 when the bios appears. You should be prompted with several options, one of which is "Safe Mode". Choose this & report how the monitor behaves.
Look inside for bad caps with bulgng tops, worst case will be shorted out transistors in the backlight inverter circuits or bad lamps. Check to see if you do have he 12vdc for the inveter circuits. See example of failed monitors with bad caps here: http://s807.photobucket.com/home/budm/allalbums
That's right, the problem is related to inverter, but source of it - backlight lamps (if you see an image for fractions of seconds) or MOSFETs (if you see an image for few or more seconds). Image shows up, that means inverter starts, but then goes off because inverter controller turns into protection caused by something. Checking lamps is not that hard. Disconnect all cables coming from the screen and remove chassis with PCBs, so you will keep the display itself only. Next, at the edge where high-voltage wires are coming from, there you will see tiny philips screws, take them off. Then gently and very straight pull lamps assembly off the display, one and then another. If lamp is bad you shall observe contrast black ring or black dots near to the electrodes. Bad lamps must be replaced, you can buy them on ebay, for instance, just search CCFL 19". Or, if you don't care about total brightness, you can substitute faulty lamp with 27 pF 3kV capacitor, soldered across appropriate HV-connector on the inverter board - this will work also.
I ended up fixing my problem, but I'm not sure what the solution is. I had some faulty electrical equipment that I was using to power the monitor (220V to 110V converter and a bad power strip) and I got rid of them. I was using the converter because I moved to Israel and I thought I needed to feed the monitor only 110V, but I now realize that the power cord for the monitor has a built-in converter that accepts 220V input. Now the monitor is plugged directly into the wall and is working fine. Try using a different power source (maybe the wiring or plug you're using is faulty). Good Luck!