Wai_Wai Posted March 4, 2011 Share Posted March 4, 2011 (edited) LCD monitor going black after several secondsThis is how the incident occurred.A roommate used a towel to clean the back of the monitor, but he mistakenly loosed the power cable a bit (on the monitor), and so the monitor went off. Once replugged, the monitor acted weird.Every time you switch on the monitor the screen is lit for several seconds. Then the screen will turn black (the power button is indicated on). You switch the button off and then on. The screen will show for several seconds and turn black again.I tried to remove all cables and put them back. It doesn't work.I tested the monitor in two computers with the same (miserable) result.I used different cables too. Tried both D-SUB and DVI. No luck.It's hard to believe the monitor went out of order after such clean-up. How could this happen?Any pointer to the problem? Edited March 20, 2011 by Wai_Wai Link to comment Share on other sites More sharing options...
jaclaz Posted March 4, 2011 Share Posted March 4, 2011 Any pointer to the problem?It is likely (but not "definitely") that the un-plug/re-plug caused a power surge and one (or more) capacitors ALREADY on the verge of going dead, actually died.That symptom is typical, see here:http://www.aplusperfect.com/articles/lcd_capacitor_repair jaclaz Link to comment Share on other sites More sharing options...
puntoMX Posted March 4, 2011 Share Posted March 4, 2011 Must be a HP am I right? If so it's the push-pull transistors or the coils of the backlight(s)... Link to comment Share on other sites More sharing options...
bonestonne Posted March 5, 2011 Share Posted March 5, 2011 +1 on PuntoMX. and jaclaz.I've fixed many a monitor with blown capacitor. Only way to make sure it's the capacitors and not the lights themselves is to totally rip it apart and visually check.I would say 9/10 times it's either the backlights or capacitors that are bad. That unlucky 10th time it's usually a part of the circuit that is faulty or just died, like the 22" Dell I have. No bad caps, but I needed a resistor mod to keep a circuit below 2.8W in order to keep the unit running. Link to comment Share on other sites More sharing options...
puntoMX Posted March 5, 2011 Share Posted March 5, 2011 That unlucky 10th time it's usually a part of the circuit that is faulty or just died, like the 22" Dell I have. No bad caps, but I needed a resistor mod to keep a circuit below 2.8W in order to keep the unit running.Interesting, so Dell does the same as HP. You know this fix will work for only some time do you? Link to comment Share on other sites More sharing options...
bonestonne Posted March 5, 2011 Share Posted March 5, 2011 Been proudly running since late August, and I'll run it until it dies again. Link to comment Share on other sites More sharing options...
Wai_Wai Posted March 20, 2011 Author Share Posted March 20, 2011 Thank you for all your replies.We have finally sent the LCD monitor back to the manufacturer. It fixed the problem for us within 1 day. Link to comment Share on other sites More sharing options...
puntoMX Posted March 21, 2011 Share Posted March 21, 2011 You know, would be helpful for others if you still post the brand and model please. Link to comment Share on other sites More sharing options...
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