Question about Apple 20" Flat-Panel TFT LCD Cinema Display
My new Apple 20" monitor keeps turning itself off and on while in use. The screen goes black, then comes on again.
The cables are all installed correctly.
I noticed the LED flashed 3 times recently (short short short) and so reset the PRAM according to the instructions on the Apple website. But no, the problem persists.
I also attached a surge protector, but that doesn't help either.
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Posted on Jan 02, 2017
SOURCE: Apple 20" display black screen
I've read that aftermarket DVI cable adapters don't work well with this set-up. You might try the Apple DVI to ADC adapter. It's expensive but I see them on eBay or craigslist from time to time at less than half the normal $99 cost.
Posted on Aug 17, 2009
Hello, I had the "short long short" blinking led problem with my 23" ACD after a power outage which left my screen blank and my cheek wet with a tear for my baby. I read somewhere that a guy was getting a 1 volt reading on the middle pin of his damaged 90 watt power block. I figured maybe the display might work if I could somehow block the middle pin. So I cut a small strip of paper wide enough to block just the middle pin and long enough to cover both sides, folded it to look like a "W" from the side. I then carefully pressed it into the brick receptacle with a toothpick leaving just a little slack so it would not tear when I pushed in the small white plug. It was a bit of a tight fit but guess what. IT WORKED! I am now enjoying my beloved monitor anew and saved $$$ on replacement brick or repair. If you want to try it and you feel you’ve nothing to lose, make sure you cover just the middle pin (both sides) and you may have to try a couple of times. It worked for me. I hope you have good luck too. Regards, Moozler
edit December 2016. Still working after 7 years.
***CAVEAT AND WARNING***
Use this fix at your own risk.
A faulty voltage regulator is probably the cause of failure. Voltage regulators can start a fire if too much voltage is applied.
Bud Martin's post below describes the electronic component failure that causes this problem. Thank you Bud.
Posted on Oct 27, 2009
My G4 has a ADC & VGA on the same card. The VGA works but the ADC, is doing the same thing as you described. I am searching the web, and can not find an answer to this problem. George 3/21/2010
Posted on Mar 21, 2010
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