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Backlight comes on with powerup but goes off after half a second

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  • gcsltd
    gcsltd May 11, 2010

    Have it replaced & check the inverter board as well

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  • Master
  • 11,361 Answers

Look for bad caps in the power supply first, the problem can also be abd inverter circuits or bad lamps, see example of failed monitors (most common) due to bad caps: http://s807.photobucket.com/home/budm/allalbums
Post back what you see so we can guide you further.

Posted on Feb 08, 2010

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There are two reasons, the inverter transformer, "usually more than one" is the most likely to break down, the second issue that crops up is the backlight, "again more than one" do go on a occassion.

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Sound but no picture, has worked for 4 years and went black. Cycling power displays video for a half second then goes black again.


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VP191B VIEWSONIC MONITOR POWER ON AND PICTURE SHOWS FOR HALF A SECOND THEN GOES BLANK, POWER OFF AND POWER ON PICTURE FOR HALF A SECOND AND GOES BLANK


More likely to have problem in either the backlight light inverter board or bad lamps due to poor solder connections, see http://s807.photobucket.com/home/budm/allalbums
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I have an Acer AL1912 that when you plug in the ac, the green power light will blink for about a minute and a half then go solid. The backlight will come on and you can see a faint ghost of vertical lines...


If it is still in warranty call the manufacturer.
if not give more info elah4@zoominternet.net. May be somthing simple like a cable
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Fdp2275w Gateway lcd monitor won't turn on. comes on for a second then goes black


Ok, I just got one last night, and it took a while to open the bugger. Why put screws when there are so many hidden clips to carefully pop? My poor Craftsman club card will never be the same! But, I digest...

There were two bad capacitors, the first and probably the main culprit was a 1000uF 25volt cap that had expanded and vented. I also found a 680uF 25volt cap that started to expand, and when tested it was low, about 550uF.

If you are so inclined, these can be obtained by mailorder (I use Parts Express), but Radio Shack parts can be used in a pinch, just expect to go back in there eventually. I didn't have the 105 degree low ESR caps, so I used regular ones and I had the monitor up and running in aobut 90 mins.

Check for any capacitors that are expanded at the top. Look for a dome shape or feel with your finger, it should be completely flat. Or look for the rubber bottom pushing out where it goes into the board. This is the third monitor I have repaired in the last six months, and each one needed one or two capacitors to fix a dark back-light problem.

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You need to replace the inverter board if you can find the spare part. Otherwise you need to replace the whole lcd panel.

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