Question about Dell UltraSharp 1905FP 19" LCD Monitor
Monitor powers up long enough for computer to boot, then the screen goes black. Sometimes the screen flickers slightly before this happens. When I lose the video I will see faint colored vertical lines that dissolve into black. The power light remains lit. If I turn off the monitor and power up again I will have video for a few minutes more. Any thoughts on what the problem is? Thanks.
Posted by Anonymous on
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Posted on Jan 02, 2017
Any luck with the Dell people?
A favor if I may, at your convenience, would appreciate if you can rate our Live Session as you see it fit.
Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Posted on Aug 06, 2008
Thanks for the suggestion, I have finally found out that the back light for the monitor is culprit. Also dell people and confirmed it . They aggred for a replacement. Thanks for the suggestion again.
Posted on Nov 25, 2008
SOURCE: Screen goes blank
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Cause of power going
off: There is a bad 1000uF, 16V cap
on the power supply board.
Solution: Replace cap. Radio Shack sells a 1000uF, 35V cap for $2. This will work.
Why did the cap go bad? The cap is too close to a heat sink and over heated.
What does this cap do? This cap sends a signal to an IC which keeps the monitor 'on' after the power switch is pushed. When the cap is weak, AC ripple voltage is applied to the IC and it sends a signal to shut the monitor off.
Opening the Monitor: These monitors are difficult to open.
The two plastic pieces snap together and must be pried apart with a flat screw driver.
After removing the stand, you need to insert a flat screw driver at the bottom of the screen where two slots are located. Then work the screw driver around until the two plastic pieces are separated.
Remove the cover plate and unscrew the push button circuit board.
Unplug the monitor cords from the driver board and remove the screen.
Unscrew the mounting screws from the power supply board and remove.
You will need to pinch the plastic support in the middle of the board to remove.
Cap is located near a copper heat sink and the value will be on the side of the cap. It will be bulged up on the top. You will see burn marks on the board surrounding the cap. Unsolder the cap.
Install the new cap and solder. Make sure you connect + of the cap to + marked on the board.
Be careful not to solder across joints.
Keep leads long so you can bend the cap as far away from the heat sink as possible.
Reassemble monitor and turn on.
This should solve the problem.
Posted on Jan 01, 2009
We have a dis-assebly and repair guide posted on our web site at:
The problem is usually the driver transistors, our guide shows where they are and what to replace to get your monitor back running again.
I hope this helps, If so please rate my solution.
Posted on Jul 30, 2009
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