Acer AL2216W / DAC-19M009 dead?

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  • hitz
    Member
    • Jan 2013
    • 36
    • germany

    #21
    Re: Acer AL2216W / DAC-19M009 dead?

    U7 gives me 13 Ohms on middle pin vs. ground from the VGA connector, close enough to zero? =(

    Comment

    • jetadm123
      Badcaps Legend
      • Feb 2010
      • 2169

      #22
      Re: Acer AL2216W / DAC-19M009 dead?

      Well, the regulator could be internally shorted to ground. The only real way to test would be to remove U7 from the board and measure the middle pad to ground. Once off, you can also try testing U7 with a 9V battery. Apply the 9V to the input and measure the output with your meter. However, without a load on the regulator, there's potential for a false reading. Of course, if you read a zero volt output, then you know it's bad for sure.

      Comment

      • hitz
        Member
        • Jan 2013
        • 36
        • germany

        #23
        Re: Acer AL2216W / DAC-19M009 dead?

        Okay, i'll try it tomorrow. Thank you so far

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Acer AL2216W / DAC-19M009 dead?

          Looks like Jetadm is leading you to the right path to find the problem. If you remove the regulator and the low resistance reading is still there, then you can possible have bad MLCC , there are 5 of them that are connected to the regulator output pin, they tend to fail shorted out.
          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

          • hitz
            Member
            • Jan 2013
            • 36
            • germany

            #25
            Re: Acer AL2216W / DAC-19M009 dead?

            I just unsoldered the regulator. Its resistance values are:

            GND/ADJ - OUT: 338 Ohms
            GND/ADJ - IN: 1810 Ohms
            IN - OUT: 1491 Ohms

            Looks fine so far, I guess.

            I measured the caps you marked on the picture. I unsoldered one side of each one and measured eachs resistance, all infinte -> caps are fine too?

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Acer AL2216W / DAC-19M009 dead?

              Are these the value measure at the pads on the board without the regulaor or the measurement made on the regulator itself?
              The resistance we are interested in is the OUT pin pad and Ground pad reading.
              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

              • hitz
                Member
                • Jan 2013
                • 36
                • germany

                #27
                Re: Acer AL2216W / DAC-19M009 dead?

                Values are from the regulator itself. So I have to unsolder it again and measure between the connectors on the circuit board?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: Acer AL2216W / DAC-19M009 dead?

                  We need to find out where the 13 Ohms reading on the OUT pin is from.
                  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

                  • hitz
                    Member
                    • Jan 2013
                    • 36
                    • germany

                    #29
                    Re: Acer AL2216W / DAC-19M009 dead?

                    Ah okay. I unsoldered it and it gives me the 13 Ohms between GND/ADJ- and OUT-pad.

                    Following the conducting path near the left cap you marked me (red) led me to the blue marked component. Ohm-meter gives me 13 Ohms between both pins and 0 Ohms between bottom pin and ground of the DVI-connector. The brown color implies that component being burnt, especially because its nearby "friends" are all black. What kind is it? It says "Z6" on circuit board and C2 (or 02?) on the component itself.
                    Attached Files

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Acer AL2216W / DAC-19M009 dead?

                      OK, you found it! Those are protection diodes for the Video dvi input signal, you can remove the burnt one out and see if the 13 Ohms goes away. They are use for the surge and spike protection for the DVI, there should be similar setup for the VGA input 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

                      • hitz
                        Member
                        • Jan 2013
                        • 36
                        • germany

                        #31
                        Re: Acer AL2216W / DAC-19M009 dead?

                        I removed the burnt one and reassembled the monitor as far as needed to test if it works now.
                        Plugged it in -> no LED, no starting possible.
                        I measured the Voltage of top 2 pins from the PSU: 1.11V giving me 1.27V on the circuit where the sources of the LED-MOSFETs and the OUT-pin of the regulator are in. Any new ideas? :/

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: Acer AL2216W / DAC-19M009 dead?

                          Ok , so the 13 Ohms is no longer there? And unless I read it wrong, what voltage do you get now at the Out put of the regulator, it should be 3.3V as Jetadm had indicated.
                          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

                          • hitz
                            Member
                            • Jan 2013
                            • 36
                            • germany

                            #33
                            Re: Acer AL2216W / DAC-19M009 dead?

                            13 Ohms gone, 338 Ohms now (guess from the regulator OUT-GND).
                            The voltage is the 1.27V I mentioned above (remeasure gave me 1.35V now), thats the circuit in which the sources of the status LED controllers are.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: Acer AL2216W / DAC-19M009 dead?

                              From the thread, it is indicated that this is a 3.3V regulator, same as the other one on this board, both of them has the same number printed on them, right? If that is the case, this one should also put out 3.3v, it could be damaged due to that 13 OHMS load. You were getting less than 0.5V before you found that shorted component.
                              Last edited by budm; 01-03-2013, 03:19 PM.
                              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

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #35
                                Re: Acer AL2216W / DAC-19M009 dead?

                                Did you test the regulator with the 9 volt battery? - post 22
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                • hitz
                                  Member
                                  • Jan 2013
                                  • 36
                                  • germany

                                  #36
                                  Re: Acer AL2216W / DAC-19M009 dead?

                                  Yes, i just did. New 9V battery (delivered 9.6V) attached to the regulator gave me 3.6V from OUT-pin.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #37
                                    Re: Acer AL2216W / DAC-19M009 dead?

                                    The ADJ pin connected to the Negative of the batteries, and put a 100 Ohms resistor between Out pin and negative of the batteries, then check the output reading again.
                                    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

                                    • hitz
                                      Member
                                      • Jan 2013
                                      • 36
                                      • germany

                                      #38
                                      Re: Acer AL2216W / DAC-19M009 dead?

                                      Guess i just wrecked it. Shortened OUT and GND with my multimeter tip, 0V OUT since then.

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #39
                                        Re: Acer AL2216W / DAC-19M009 dead?

                                        I still think this regulator is already bad, I would just get another one.
                                        By the way, when you were measuing 3.6V at the output pin, was the AGJ pin connected to the negative of the batteries, if not, that may explain why you are getting 3.6 instead of 3.3V
                                        Last edited by budm; 01-03-2013, 05:50 PM.
                                        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

                                        • hitz
                                          Member
                                          • Jan 2013
                                          • 36
                                          • germany

                                          #40
                                          Re: Acer AL2216W / DAC-19M009 dead?

                                          I'll order some new, hope they will be delivered on saturday and 0.29€/pc is a good price

                                          I checked the voltage of the battery with my multimeter, positive 9.6V were shown, so I put the GND/ADJ pin to the battery terminal where the black tip was while measuring the voltage.

                                          Comment

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