Question about Acer AL712 17" LCD Monitor

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Monitor will not power up

With out any previous problems, my AL712 will no longer power up. I've checked all the usual with changing cables for ones that are definitely OK and I've taken it apart and checked the power supply fuse. With the case off, toggling the mains on off rocker switch does give a small result. There is the small click on the in built speakers as they receive power and a little bit of gass/static type noise from the monitor. And if plugged in as a second monitor on a laptop it is still seen. Any suggestions?

Posted by Andrew Stringer on

  • 2 more comments 
  • frogleg Apr 19, 2008

    I had the same problems with a PE171 monitor. The circuit board is pwb276. Is anyone familiar with what U920 and U960 are? I can't find their brand on the web. They are marked L26CA and L31CA. The problem was U920 had a hole blown in the top of the plastic and U960 overheated and discolored the ciruit board, evaporated solder. I'm not sure if this was the cause of the original problem. Since turning the monitor off meant cycling the power until it remained on, my son left the monitor on 24/7. At night he put a jacket over it and that may have overheated the board and caused the problems with U920 and U960. Anyway if I can find u920/u960 then I'll replace them and go from there. Or where can these boards be bought?

  • jjkool Feb 06, 2009

    I have the same problem... I cannot fix it, and it is the inverter board... Anyone know which chips commonly die on these?? The power goes on, BL is on for a second then goes out... HELP!

    The board is also labelled pk10v000710 jm777y


  • Bigcow Apr 29, 2009

    In the power supply part, U801 and 4 SMD resistors(R819,R819A, R820, R820A) were blown out in my AL712 LCD Monitor. Can anyone tell me the numbers/letters on U801 and the SMD resistors?

  • Bigcow Apr 29, 2009

    In the power supply part, U801 and 4 SMD resistors(R819,R819A, R820, R820A) were blown out in my AL712 LCD Monitor. Can anyone tell me the numbers/letters on U801 and the SMD resistors?



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  • 47 Answers

Hi tafkab, Sounds like it's probably the backlight inverter board. Try the test I have at the bottom to see. It's a very common problem. LCD's use four small Cold Compact Fluorescent bulbs to back light the display. (thats what gives the LCD it's brightness allowing you to see it) The inverter board runs these lights and when they go bad they will typically show symptoms like you have or the monitor power light comes on and you have either no display or a very dim display. If you ever have one that has no display but the power light is on you can check by shining a flashlight directly into the LCD from the front (right into the screen) if you can see an image then it's either the inverter board (most likely) or the CCFL bulbs have gone bad. The inverter board and CCFL's are replaceable. Good Luck, Dude

Posted on Nov 26, 2006


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