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    #1

    Acer AL2017 no power

    Hello everyone.

    A complete novice here when it comes to the electronics side of things. I have fixed 1 LCD so far and it worked first time, all thanks to reading messages on this fourm and now I have a question to ask.

    I have received an Acer AL2017 that has no power whatsoever. The power button does nothing and no green or amber light comes on. Apparently the monitor was on and working, the screen flickered and then it was dead.

    The power board and caps look good to me, nothing blown or bulging.

    Here is a picture of the board

    Can someone make any recommendations on where to start?

    I have a very basic digital multimeter (Radio Shack Micronta - 20 years old?) but don't know how to use it other than check AA, 9V batteries - it's ok to laugh.

    Thank you,
    Mike
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    #2
    Re: Acer AL2017 no power

    Do the basics first: with power off and monitor unplugged, set your meter to resistance, test the round black fuse directly behind the main power connector. Fuse should read no more than 0-2 ohms. If this fuse is ok, then with power on, measure the voltage across the 150uf,400V cap. If you're in the USA the voltage should be around 165 VDC.
    Last edited by jetadm123; 03-03-2011, 05:00 PM.

    Comment

      #3
      Re: Acer AL2017 no power

      See these two threads here:
      https://www.badcaps.net/forum/showthread.php?t=7803
      https://www.badcaps.net/forum/showthread.php?t=12014

      In the second thread, I had the same problem with nothing happening when turning the screen on, and the guy I sold it to fixed it by replacing the small starter capacitor near the main primary capacitor.

      I still have a list of all the capacitors I used to repairt it, if you want I can give you the relevant part numbers for Digikey.
      "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

      -Leonid Brezhnev (On the Yom Kippur War)

      Comment

        #4
        Re: Acer AL2017 no power

        Hi Jetadm123.

        I'm in Canada so the same voltage.

        Hmmm...... after about 30 minutes I figured out how to test the round black fuse. It measured .012 ohms.

        Can't say I'm anywhere comfortable in testing with live power, again a noob with a multimeter. However, with no power that big cap 150uf, 400v did test out with 166 ohms. Not sure if that helps or not.

        There is a glass fuse around the middle of the board(F200) and it is not blown.

        Thanks

        Comment

          #5
          Re: Acer AL2017 no power

          Appreciate the 2 links and your own struggles with the same board.

          The second link will take a bit of time to digest and will see how far I make it.

          It's a bit overwhelming trying to understand all of this but I'm trying.

          Thanks again for the info


          Originally posted by mockingbird View Post
          See these two threads here:
          https://www.badcaps.net/forum/showthread.php?t=7803
          https://www.badcaps.net/forum/showthread.php?t=12014

          In the second thread, I had the same problem with nothing happening when turning the screen on, and the guy I sold it to fixed it by replacing the small starter capacitor near the main primary capacitor.

          I still have a list of all the capacitors I used to repairt it, if you want I can give you the relevant part numbers for Digikey.

          Comment

            #6
            Re: Acer AL2017 no power

            Originally posted by porcupine View Post
            Hi Jetadm123.

            I'm in Canada so the same voltage.

            Hmmm...... after about 30 minutes I figured out how to test the round black fuse. It measured .012 ohms.

            Can't say I'm anywhere comfortable in testing with live power, again a noob with a multimeter. However, with no power that big cap 150uf, 400v did test out with 166 ohms. Not sure if that helps or not.

            There is a glass fuse around the middle of the board(F200) and it is not blown.

            Thanks


            The fuse looks good, but measuring the resistance across the large cap is of little use. Eventually, you'll probably be asked to make some voltage measurements. Even if you are asked to measure a low voltage, high voltage will be present at all times. Seriously, this is not the type of board to learn electronics on, especially if you're not willing to work with high voltage.

            I highly recommend watching some YouTube videos on "how to use a DMM" before going any further.

            Comment

              #7
              Re: Acer AL2017 no power

              Originally posted by porcupine View Post
              Hi Jetadm123.

              I'm in Canada so the same voltage.

              Hmmm...... after about 30 minutes I figured out how to test the round black fuse. It measured .012 ohms.

              Can't say I'm anywhere comfortable in testing with live power, again a noob with a multimeter. However, with no power that big cap 150uf, 400v did test out with 166 ohms. Not sure if that helps or not.

              There is a glass fuse around the middle of the board(F200) and it is not blown.

              Thanks
              I'm a little concerned about the reading you got for the fuse. It takes an excellent ohmmeter to read below 1 ohm accurately. I wouldn't expect to see one of them sold by Radio Shack. What range did you have the ohmmeter on?

              PlainBill
              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

              Comment

                #8
                Re: Acer AL2017 no power

                Yup, I hear you, don't need to get killed over a 50 cent problem and that's why I was upfront about being a total novice and not comfortable in doing a live check on the board. Replacing bad cap's is another story.


                Anyone know of someone in Ontario that do a repair or if one can buy an Acer power board for the LCD?

                Cheers


                Originally posted by jetadm123 View Post
                The fuse looks good, but measuring the resistance across the large cap is of little use. Eventually, you'll probably be asked to make some voltage measurements. Even if you are asked to measure a low voltage, high voltage will be present at all times. Seriously, this is not the type of board to learn electronics on, especially if you're not willing to work with high voltage.

                I highly recommend watching some YouTube videos on "how to use a DMM" before going any further.

                Comment

                  #9
                  Re: Acer AL2017 no power

                  The setting was on 2, it can support 2, 20, 200 etc.
                  Appreciate the comment, think I'm in over my head here. The Rat Shack meter was free, can't complain but sounds like it's sorely outdated too.
                  Cheers


                  Originally posted by PlainBill View Post
                  I'm a little concerned about the reading you got for the fuse. It takes an excellent ohmmeter to read below 1 ohm accurately. I wouldn't expect to see one of them sold by Radio Shack. What range did you have the ohmmeter on?

                  PlainBill

                  Comment

                    #10
                    Re: Acer AL2017 no power

                    Originally posted by porcupine View Post
                    The setting was on 2, it can support 2, 20, 200 etc.
                    Appreciate the comment, think I'm in over my head here. The Rat Shack meter was free, can't complain but sounds like it's sorely outdated too.
                    Cheers
                    Ordinarily the lowest resistance range on a DMM is 200 ohms. That would mean your lowest resistance reading on the typical 3 1/2 digit DMM would be .1 ohms. One way to verify this is to set the meter on the lowest ohms range and short the probe tips together. It should read slightly below 1 ohm.

                    PlainBill
                    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                    Comment

                      #11
                      Re: Acer AL2017 no power

                      Originally posted by porcupine View Post
                      The setting was on 2, it can support 2, 20, 200 etc.
                      A picture of the dmm would help.
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                        #12
                        Re: Acer AL2017 no power

                        Originally posted by porcupine View Post
                        Anyone know of someone in Ontario that do a repair or if one can buy an Acer power board for the LCD?
                        The absence of the green power LED doesn't necessarily mean it is a power board problem. The logic board is what controls the power LED.

                        To narrow down which is at fault, you will have to make a DC voltage measurement at the connector between the power and logic board. This is usually low DC voltage like 19V DC or less. The logic board voltages are usually 5V DC or less.
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                        We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                        Please do not post inline and offsite as they slow down the loading of pages.

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