Having problems with your BenQ Computer Monitors ?

Monitor turns black after 3 seconds

\015 I've been using my monitor Benq T906 without problems for a couple of years. The monitor is connected to a portable PC. Since a few days, as I switch on the monitor I can see the image I have on my PC but after approx two-three seconds the screen turns black. The 'power up' led on the monitro remains green.It looks like a hardware problem.I replaced the video cable and the power cable but no change.I've aready opened up the monitor but couldn't identify anything damaged/burn visually.Note that the monitor didn't fall or got hit, it just started turning black after 3 seconds power up. During the 3 seconds I can see the image.If I open the monitor, is there any specific component I can investigate for failure? Thanks in advance for the assistance\015

Answers :

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
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