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Acer AL2416W Works, then fades to white then black...

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    #21
    Re: Acer AL2416W Works, then fades to white then black...

    Originally posted by Sparky-Steve View Post
    In regards to the text, the top right (U17 / with the cut middle leg):

    33
    APL1084
    WJ1DM

    And the bottom one (U18):

    APL1117
    PJ21M18
    The 33 on U17 indicates that the output voltage should be 3.3 +/- 1% so your reading of 3.29 indicates it is good.

    The 18 in part number APL1117 PJ21M18 indicates that the output voltage should be 1.8 +/- 1% so your reading of 1.804 indicates it is good.
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      #22
      Re: Acer AL2416W Works, then fades to white then black...

      thanks for confirming these components are good. Forgive my naivety, but does that give any indication as to what has gone wrong or where I should be looking next?

      thanks
      Steve

      Comment

        #23
        Re: Acer AL2416W Works, then fades to white then black...

        It looks like behind the metal shield is a t-con (directly above the power and main board). Remove the shield and take a picture of it.

        edit: If you haven't done so, reseat and clean all the connectors originating from the t-con board.
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          #24
          Re: Acer AL2416W Works, then fades to white then black...

          Hiya,

          I've reseated everything.

          Here's the requested picture....

          Steve
          Attached Files

          Comment

            #25
            Re: Acer AL2416W Works, then fades to white then black...

            I had this problem with a "Xerox" monitor (actually a Proview.) Got it from my brother who was about to throw it out.

            Would power up with Xerox logo fine, and show desktop for about half a second, then desktop image would slowly fade to white from the outside in... Turned out to be 7 bad caps on PSU, probably causing problem with 5V rail.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

              #26
              Re: Acer AL2416W Works, then fades to white then black...

              Originally posted by Sparky-Steve View Post
              Here's the requested picture....
              That is the power board. We need the board above it that is behind the metal covers.
              Attached Files
              Last edited by retiredcaps; 03-19-2012, 01:34 PM.
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                #27
                Re: Acer AL2416W Works, then fades to white then black...

                The T-Con board is where the white flat flex-cable coming from the mainboard (the one with the VGA input) plugs in to.

                In the pic in the post above, it's the white cable in the bottom left. You need to find the other end, which will be the T-Con board.

                What retiredcaps marked is just the mounting bracket for the stand (the image/monitor is upside down)

                Comment

                  #28
                  Re: Acer AL2416W Works, then fades to white then black...

                  Originally posted by Scenic View Post
                  What retiredcaps marked is just the mounting bracket for the stand (the image/monitor is upside down)
                  I'm glad someone is on the ball!
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                    #29
                    Re: Acer AL2416W Works, then fades to white then black...

                    I'm struggling to find out how to get to this t-con board, but i'm spending this afternoon trying.....

                    Comment

                      #30
                      Re: Acer AL2416W Works, then fades to white then black...

                      Huh... I had to dismantle absolutely everything to get to that board; picture is attached. Looks fine to my untrained eye.....

                      Anything?

                      Steve
                      Attached Files

                      Comment

                        #31
                        Re: Acer AL2416W Works, then fades to white then black...

                        Originally posted by Sparky-Steve View Post
                        Anything?
                        1) Clean all the connectors (CN1, CN2, and CN3) and its cables with isopropyl alcohol.

                        2) Using a ground screw on the t-con, measure the DC voltages of IC3 and IC4. Measure the 3 pins and ignore the fat tab. Report the part number and DC voltages.
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                          #32
                          Re: Acer AL2416W Works, then fades to white then black...

                          1) Done

                          2)

                          IC3 - with fat tab at top, readings L to R: 15.3mV, 3.32V, 4.9V
                          IC4 - with fat tab at top, readings L to R: 15.1mV, 3.33V, 4.9V

                          Steve

                          Comment

                            #33
                            Re: Acer AL2416W Works, then fades to white then black...

                            Please check the switching power supply section as shown in PDF.
                            Attached Files
                            Never stop learning
                            Basic LCD TV and Monitor troubleshooting guides.
                            http://www.badcaps.net/forum/showthr...956#post305956

                            Voltage Regulator (LDO) testing:
                            http://www.badcaps.net/forum/showthr...999#post300999

                            Inverter testing using old CFL:
                            http://www.badcaps.net/forum/showthr...er+testing+cfl

                            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                            http://s807.photobucket.com/user/budm/library/

                            TV Factory reset codes listing:
                            http://www.badcaps.net/forum/showthread.php?t=24809

                            Comment

                              #34
                              Re: Acer AL2416W Works, then fades to white then black...

                              CC15,17,18-21 all measure 11.98v across the caps
                              CC10 & CC13 are 4.86v

                              Comment

                                #35
                                Re: Acer AL2416W Works, then fades to white then black...

                                So you are getting these correct voltages when the screen turns white also?
                                Never stop learning
                                Basic LCD TV and Monitor troubleshooting guides.
                                http://www.badcaps.net/forum/showthr...956#post305956

                                Voltage Regulator (LDO) testing:
                                http://www.badcaps.net/forum/showthr...999#post300999

                                Inverter testing using old CFL:
                                http://www.badcaps.net/forum/showthr...er+testing+cfl

                                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                http://s807.photobucket.com/user/budm/library/

                                TV Factory reset codes listing:
                                http://www.badcaps.net/forum/showthread.php?t=24809

                                Comment

                                  #36
                                  Re: Acer AL2416W Works, then fades to white then black...

                                  In order to test it live, and be able to see the screen, I've had to rig it up somewhat precariously; this is now on test, and right now, the screen is fine; I expect it to fail within the next 30 minutes or so, at which time I will take the readings again.

                                  Comment

                                    #37
                                    Re: Acer AL2416W Works, then fades to white then black...

                                    well.. it's been on test for 90 minutes now, and it's still working - it has never gone past 40 minutes before....

                                    At the moment, either (a) it's behaving, but will pack up soon, or (b) whilst completely dismantling the unit to run it live & open, I've "fixed" something, even though I had previously reseated all connections....

                                    I'll update this thread either when it fails, or in a week if it continues to run fine.

                                    cheers for now

                                    Steve

                                    Comment

                                      #38
                                      Re: Acer AL2416W Works, then fades to white then black...

                                      Theory: running it while open doesn't cause the failure to happen / a part to overheat due to better cooling?

                                      Comment

                                        #39
                                        Re: Acer AL2416W Works, then fades to white then black...

                                        I'm not convinced of that theory, as I have been running it open for over a week; the only thing that has changed is that I had to remove the T-CON board completely, and since doing so, it hasn't yet gone wrong - now on 2h30min and still running nicely.

                                        My first theory.... the T-CON board, or a connector, was loose, or had some dirt.

                                        My second theory.... pot luck, and it'll revert to failure soon!

                                        Only time will tell! :-)

                                        Steve

                                        Comment

                                          #40
                                          Re: Acer AL2416W Works, then fades to white then black...

                                          Just to close this case, the monitor continues to work absolutely fine; I do not know what I did precisely to fix it, but it does appear to be fixed.

                                          Many thanks to all who participated.

                                          Steve

                                          Comment

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