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Monitor sharp ll172a turns on then off to stand by backlights test ok no shorts to be found think might be mem chip can yo u help dave.

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Ive had this problem a few times.and it has come down to a bad memory card.or turn off pc remove memory card clean it with an eraser then replace it..it shold work..steve card may be shot period also if it doesnt work.steve

Posted on Feb 28, 2009

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Posted on Jan 02, 2017

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1 Answer

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LED is on that indicates the power supply is working, so most likely you have there problem with inverter/backlight. To see easier how backlight behaves, unplug flat cable from processor board, so display itself won't be powered and light will go through it. Now if you turn on the monitor you will see the screen turns white for some short time and then turns off again. That's because CCFL driver chip turns into protection.
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1 Answer

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if u have warrenty then immediately contact u r dell service.
he check the problem and replace new one.

i also suffer same problem.

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I just changed my video card and after turning up my screen refresh rate (Hz) my monitor started doing the same thing. Monitor worked great for a long time but now its done! The only thing I can think of is that it has to have 60Hz, turn it up for gaming and its too sensitive to frequency. By the way, mine will turn on after a few power cycles.

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I DID REPAIR A MONITOR WITH THE SAME PROBLEM. IT TURNED OUT, THAT ONE OF THE TWO HIGH TENSION GENERATORS FOR THE 2 LIGHTTUBES WAS BURNED OUT. BY REPLACING THE POWER TRANSISTORS AND THE 3 AMP. FUSE ON THE MAINBOARD THE MONITOR IS RUNNING AGAIN VERY WELL.

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