Question about Acer AL1912B 19" LCD Monitor

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Acer AL1912 will turn on at start-up or coming out of sleep -- most of the time. It does show the Acer logo for a short while then goes black. None of the control buttons respond. The green light blinks.\r\n About 10 percent of the time it shows a white/gray screen with bands of black and colors (sort of like a test pattern) and eventually reverts either to black or (about 5 percent of time) actually comes on. I've disabled sleep mode both for monitor and HD. Have same problem at cold start-up. Sometimes, disconnecting and waiting (allowing to cool??) will result in it's starting -- sometimes normally sometimes with banding. XP with an Intel chip ATI Raethon

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  • twistymaze Nov 07, 2010

    Thanks for your response. I'm responding with the monitor ON right now. It seems to work fine as long as it isn't turned off or, I found, adjusted -- as in resolution. Anything that makes the screen go black stays black or exhibits the behavior I described previously.




    Does this gibe with your hypothesis?

    Also where do I buy capacitors?

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  • Acer Master
  • 13,433 Answers

Hello

This absolutely sounds like the powersupply on the lcd screen is faulty, very common its the electrolyte capacitors that cost around 1 dollar each, and you can replace these yourself, with same value and voltage capacitors.

Another possible cause is the capacitors on the mainboard of the display, but it sounds like the mainboard is OK since you get it to start up sometimes, it seems like its not geting proper power from the powersupply.


Here is a picture of two GOOD capacitors
http://www.capacitorlab.com/capacitor-types-electrolytic/radial-capacitor-polarity.jpg

On a bad cap the surface, top, will not be flat, it might bulge even just a little bit and its difficult to notice.

You will probably get best and lasting results by replacing all the bigger capacitors but not the huge one.

To just fix the problem, you need to replace the faulty caps.

That should be it.

How to take apart an lcd display?

Unscrew all screws in the display, check under all labels and soft objects, remove the stand and check for additional screws.

Once you have confirmed that all screws are out, the casing is held in place with plastic clips that you can release with either your fingernails or a plastic stick or a flat screw driver on the edges openings of the casing, on the sides of the display. you need to go around the whole display until it comes apart, after that its pretty simple.

let me know if you have any questions.

Posted on Nov 07, 2010

  • 1 more comment 
  • Ekse Nov 07, 2010

    Well yes, the screen has to turn off for a moment and start up with another resolution.

    It is most likely the powersupply thats the problem ,or then the mainboard of the display has issues.

    The mainboards components and mainly too small to replace at home, and its far more complex than the powersupply board.

    You would need a soldering iron and solder, solder remover or ******, etc and know how to soder.

    Caps you can buy for example on ebay, or on electronic parts resellers.
    http://shop.ebay.com/i.html?_nkw=capacit...

  • Ekse Nov 07, 2010

    The sensored word was Soder_sucker or Metal_Solder_Su_cker_.

  • Ekse Nov 07, 2010

    which can be purchased either on ebay as well or check http://www.qwikfast.co.uk/catalogue/sold...

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