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Hello, Did you just resolder the capacitors? They need to be replaced not resoldered. When they start failing they can give exactly the type of problems you have, flickering or wavy picture, Slow display of picture when you power up monitor or very dark picture. Here is a link to an article that talks about replacing the capacitors and what you need to look for and what to replace; http://www.ccl-la.com/blog/index.php/capacitors/ If you have any questions please let us know at: firstname.lastname@example.org
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As a general rule, this is a panel failing.
The panel is working for a few minutes until it heats up then begins to breakdown. Blowing air onto it wont help since the area in question is under another panel inside the monitor.
The video control board (inside the monitor that converts signals between your PC and the physical panel) could be failing.
Another source of the problem, though rare, is the capacitors that filter power for the panel's power supply (on the main powerboard) begin to break down and that is enough to cause the issue.
Because this is a BenQ, it may come back to life if you replace any capacitor that looks even remotely suspect & resolder all the main components on the powerboard.
Be warned, there are dangerous voltages stored by the main filter capacitor that can kill even if the monitor has been unplugged for several hours.
teo6925, "Switch-mode-power-supply" is in partial shutdown mode. Can you see any electrolytic filter capacitors that have a slight "swelling" to their tops? They should be flat!! You may also need to inspect all the soldered component connections very closely for cold, thermally intermittant, "frosty" looking solder joint connections. May need large magnifying glass or 10x to 20x inspection microscope to locate these thermal/vibration "fractures" and then resolder them! If you have a capacitor problem, then you will need to carefully remove and replace with new ones. If you are novice at soldering I suggest that you document your work with digital camera or video tape so you can get everything back together with no "leftover" pieces! Teo, all you need to do to find out how BAD the problem of poorly manufactured capacitors is would be to search WEB for BAD CAPACITORS!!! Look for pic's of ELITE capacitors or CAPXON brand. You will be stunned beyond belief!!! Reading is free!! READ, READ, READ. Let us know what you find and do additional comment here on FIXYA. 12fixlouie
Usually this type of problem is due to a faulty electrolytic capacitor on the monitor's power supply board or the inverter board that powers the backlight lamps. If you have a soldering iron and some technical skill it's possible to repair this yourself, if you can determine the bad component. Look for a capacitor with a domed top, or what looks like corrosion or leaked fluid on the top. If you replace the capacitor with one of the same rating and type (in volts and microfarads (uf)) it may fix the problem.
The backlights are usually not the problem in this case, I've fixed dozens of monitors and it has always been a faulty capacitor.
If you are willing to try this, there are lots of resources on the internet that will provide instructions for how to do this. Replacment capacitors can be purchased (usually $0.50 or $1 each) from many electronics suppliers and on eBay.