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    #1

    No image

    Acer al1706 lcd no image power led is green and the display is on what is the problem?
    Tags: None
    #2
    Re: No image

    Too few details to help you: it's completely black (no signal) or you can barely see an image (dead backlight tube and/or inverter). Can you see the OSD menu or not?
    At first check the obvious: secure the vga cable with all screws; try connecting it to another computer too.

    Zandrax
    Have an happy life.

    Comment

      #3
      Re: No image

      i not see osd menu and display is black.

      Comment

        #4
        Re: No image

        Is power light on?
        Mann-Made Global Warming.
        - We should be more concerned about the Intellectual Climate.
        -
        Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
        - Dr Seuss
        -
        You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
        -

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          #5
          Re: No image

          open up and check caps are the domed on top ?

          Comment

            #6
            Re: No image

            Might help to know if it's just the backlight or the whole thing BEFORE you tear it apart.
            Mann-Made Global Warming.
            - We should be more concerned about the Intellectual Climate.
            -
            Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
            - Dr Seuss
            -
            You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
            -

            Comment

              #7
              Re: No image

              Shine a bright flashlight with the LCD on and plugged into a computer if you see a faint image it's a backlight problem.
              Elements of the past and the future combining to make something not quite as good as either.

              Comment

                #8
                Re: No image

                Originally posted by Krankshaft
                Shine a bright flashlight with the LCD on and plugged into a computer if you see a faint image it's a backlight problem.
                Exactly correct.

                Might have to try the beam from several angles to be sure.
                Mann-Made Global Warming.
                - We should be more concerned about the Intellectual Climate.
                -
                Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                - Dr Seuss
                -
                You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                -

                Comment

                  #9
                  Re: No image

                  I've had about 15 of the AL1706 monitors go bad so far. It's most always the power supply and the same 3 capacitors that have gone bad. Replacing two 1000uf 10v and sometimes the 1000 uf 25v corrects the problem.

                  Comment

                    #10
                    Re: No image

                    Originally posted by djames100
                    I've had about 15 of the AL1706 monitors go bad so far. It's most always the power supply and the same 3 capacitors that have gone bad. Replacing two 1000uf 10v and sometimes the 1000 uf 25v corrects the problem.
                    I agree, three 1000uf caps (two 10v and one). I change them all, even the inverter's side one. They are just a few.
                    Attached Files
                    There are 10 kind of people in this world: those that understand binary, and those who don't.
                    • ASUS ROG Maximus IX Code
                    • Intel Core i5-7600K 3.8GHz
                    • 16gb GSKILL TridentZ RGB DDR4-3200
                    • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                    • Windows 10 Pro x64
                    • GeForce GT1050
                      2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                    Comment

                      #11
                      Re: No image

                      My board looks a little different. I wonder if there are different revisions of the AL 1706.
                      Attached Files

                      Comment

                        #12
                        Re: No image

                        Originally posted by djames100
                        My board looks a little different. I wonder if there are different revisions of the AL 1706.
                        I've seen AL170A, AL1706b, AL1706A/Ab and 1706Ab. This board comes from an AL1706A/Ab. Maybe there lies the difference.
                        There are 10 kind of people in this world: those that understand binary, and those who don't.
                        • ASUS ROG Maximus IX Code
                        • Intel Core i5-7600K 3.8GHz
                        • 16gb GSKILL TridentZ RGB DDR4-3200
                        • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                        • Windows 10 Pro x64
                        • GeForce GT1050
                          2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                        Comment

                          #13
                          Re: No image

                          I've got the same board as djames100. The caps are testing ok on my Blue ESR meter, I'm getting 5v on the output to the processor board on pins 1 and 2. 12v to pin 13 on the inverter IC. But still no power LED and no display or backlights. I found this link from acer and I've been poking through the flow chart, but its a little over my head. I've found a couple resistors that seem to not match their numbers.



                          In circuit:
                          R818 is pretty low 2100-2500 depending on polarity supposed to be 3300
                          R810 is supposed to be 5100ohms and is reading 4100ohm and 2500ohms depending on polarity.
                          R811 is supposed to be 43000ohms and just climbs from 20000 up to ???

                          Any comments from the experts before I go replacing things?

                          Comment

                            #14
                            Re: No image

                            Originally posted by bsweasel View Post
                            I'm getting 5v on the output to the processor board on pins 1 and 2. But still no power LED and no display or backlights
                            Post a clear focused picture using manage attachments of the logic board. (please do not post inline). I suggest checking the voltage regulators on the logic board. If you are getting 5V DC to the logic board, but no power LED, the regulators could be bad?
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                              #15
                              Re: No image

                              Originally posted by retiredcaps View Post
                              Post a clear focused picture using manage attachments of the logic board. (please do not post inline). I suggest checking the voltage regulators on the logic board. If you are getting 5V DC to the logic board, but no power LED, the regulators could be bad?
                              Wise you are, retiredcaps!! It is in the logic board instead of the power supply board that I was looking at. I have a second working monitor and I swapped PS boards and the problem stays with the logic board. I'm looking for the VR's now. I'll have to post a picture later, as my phone does a horrid job at closeup pictures.

                              Comment

                                #16
                                Re: No image

                                Originally posted by retiredcaps View Post
                                Post a clear focused picture using manage attachments of the logic board. (please do not post inline). I suggest checking the voltage regulators on the logic board. If you are getting 5V DC to the logic board, but no power LED, the regulators could be bad?
                                Or the reset controller.

                                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

                                  #17
                                  Re: No image

                                  Don't have a picture yet, forgot my camera. Here is a link to a picture of the logic board. It looks just like it, and I don't see any physical damage when looking at it via a magnifying glass...

                                  http://mylcdboard.com/upfile/201012102209517500750.jpg

                                  Comment

                                    #18
                                    Re: No image

                                    U101 and U102 are your voltage regulators. The part number might be something like AS1117-33. The suffix indicates the output voltage. In this case it would be 3.3V DC.

                                    These voltage regulators have a 1% tolerance.
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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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                                      #19
                                      Re: No image

                                      U101 is dishing out 3.26v on the good board and 3.75v on the bad board.
                                      U102 is dishing out 1.79v on the good board and 1.20v on the bad board.

                                      Input voltage is the same on both boards.
                                      Schematic says U101 is 3.3v output and U102 is 1.8v output. So would both VRs be bad on the bad board? Or is something else causing the voltages to be off?
                                      Last edited by bsweasel; 01-14-2011, 03:44 PM.

                                      Comment

                                        #20
                                        Re: No image

                                        Originally posted by bsweasel View Post
                                        U101 is dishing out 3.26v on the good board and 3.75v on the bad board.
                                        U102 is dishing out 1.79v on the good board and 1.20v on the bad board.
                                        What is the actual input voltage on all pins? You measured 5V DC on the connector and I just want to see what is going into the regulator.
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