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17323
September 6th, 2015 19:00
P2412H, black screen
Hello,
This monitor has been driving me crazy. I got it for free from work and they were having issues with it as well. Basically when I turn the monitor on, whether it is connected via the DVI cable to my PC or not, it will only momentarily display the screen before it goes almost completely black. If you look very closely, you can see the display. I ordered a new power supply board and installed it, and it was working for 3 days. I wen to power up my machine today and it went back to it's old ways. I saw an old post where someone took it apart and made sure all the capacitors were aligned vertically and then it worked. I've tried this with no success. None of the capacitors appear to be bulging so I don't think that's the issue. I've just about had it with this monitor. Is there anything else I should try before calling it quits?
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DELL-Chris M
Community Manager
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56.9K Posts
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September 8th, 2015 21:00
That sounds like the LED backlight inverter has failed. Did the site where you got the power supply board list one? Of course, the market value for a used P2412H is only $170. Remember that when pricing parts.
rejester
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September 9th, 2015 20:00
Mine did the same as yours, power on, flash on the screen and black...if you strain you can see image (no backlight). I tore it apart like this other post you read and unplugged ALL the ribbon cables and other wired connections from the panel, power supply and controller. I looked for "bulging caps" and so forth on the power supply portion. I did not see anything visible to fix. So I threw the thing back together to try one more time or it goes in the trash and it's now working now. It's most likely a loose connection that is problematic with these. This LCD has LED backlight (DC voltage) and don't use a high voltage inverter that CCFL use....which are more prone to fail.
DELL-Chris M
Community Manager
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56.9K Posts
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September 10th, 2015 07:00
My mistake. Thanks for the clarification.
RchUncleSkeleto
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January 23rd, 2017 22:00
Is the monitor still functioning? Mine is having the same issue. Will randomly turn off the backlight, mostly when switching users, powering the monitor on or powering the system on. Anything that would cause it to drop signal for detection. I took mine apart and examined the power and video boards, but could not see any noticeably bad caps or damaged components. I bought mine used from a co-worker about 1 year ago and it started having issues about 7 months in. I have a viewsonic 20" that I'm using while I try to diagnose the issue with this monitor and/or find a sufficient replacement. Even though the color reproduction and gamma are totally horrible on this monitor, I'd like to be able to continue to use it.