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Old 01-29-2014, 03:10 PM   #19
HAHOMETP
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Join Date: Nov 2012
City & State: Philadelphia, PA
My Country: USA
I'm a: Hobbyist Tech
Posts: 88
Default Re: Dell 2408WFPb / 2408WFP - 7 seconds to black

Hello again, folks.

Well, this monitor is acting up again albeit in a slightly different fashion.

Recently when woken up from the sleep approximately 1/3 of the left side of the screen would remain dark followed by the classic two seconds to black syndrome. Regretfully this happens way too quickly to snap a picture.

What puzzles me is the bizarre pattern of the dark spot. The CCFL backlight in this monitor is comprised of seven U-shaped lamps. A failure of one of those lamps (or of its inverter) should result in a horizontal dark band, not vertical. I can't figure out what might cause all seven bulb be to be significantly darker in their "U" parts.

A couple of days ago the backlight has finally quit completely. Now upon the start up the backlight goes from barely perceivable grey to black in about two seconds.

Also when the monitor was still working I had noticed that immediately upon turning it on the display would be quite a bit dimmer and yellower than after a few hours of working. Could this be an indication of worn out lamps?

I have attached a .pdf file with pictures and my comments.
Attached Files
File Type: pdf Dell.2408WFPb.CCFL.pdf (2.18 MB, 240 views)
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