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    #21
    Re: DAC-19M009 dead?

    Wasn't able to get alligator clips, I ended up just doing it

    When I turn it on, the voltage is about 340V, it does jitter a little for the first couple of seconds but I think that is just lag on my multimeter (it doesn't drop to zero instantly when I remove the probes). The voltage sits at 340 the whole time (I'm in Australia)

    Comment

      #22
      Re: DAC-19M009 dead?

      What is part number red circled component (on the backside)?
      Attached Files
      Last edited by retiredcaps; 06-11-2011, 09:19 PM.
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        #23
        Re: DAC-19M009 dead?

        Originally posted by retiredcaps View Post
        What is part number red circled component (on the backside)?
        It has written on it:

        EA1532A
        6E1E607
        Hn66291

        I'm going to take some better photos of the board, should post them soon

        Comment

          #24
          Re: DAC-19M009 dead?

          Originally posted by papagoose View Post
          EA1532A
          1) This SMPS chip has been bad in other lcd cases posted here. Since all the caps have been replaced including the startup cap, this chip could be bad. That is my best guess at what is causing the voltage to drop.

          2) Digikey sells a replacement for $1.14 at (which I believe is the correct part)

          http://search.digikey.com/scripts/Dk...=568-3316-1-ND

          3) PlainBill is the real expert on concluding if this chip is bad or not by taking voltage measurements at the various pins.

          edit: He gives a good explanation at

          https://www.badcaps.net/forum/showpo...7&postcount=20

          4) If you have not done smd soldering, see

          http://www.youtube.com/watch?v=3NN7UGWYmBY
          Last edited by retiredcaps; 06-11-2011, 11:12 PM. Reason: added url foe PlainBill's explanation
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            #25
            Re: DAC-19M009 dead?

            Originally posted by retiredcaps View Post
            1) This SMPS chip has been bad in other lcd cases posted here. Since all the caps have been replaced including the startup cap, this chip could be bad.

            2) Digikey sells a replacement for $1.14 at (which I believe is the correct part)

            http://search.digikey.com/scripts/Dk...=568-3316-1-ND

            3) PlainBill is the real expert on concluding if this chip is bad or not by taking voltage measurements at the various pins.

            edit: He gives a good explanation at

            https://www.badcaps.net/forum/showpo...7&postcount=20

            4) If you have not done smd soldering, see

            http://www.youtube.com/watch?v=3NN7UGWYmBY
            Hmmm thanks for all the help I'll have to look around for where to get a replacement, shipping to Australia comes out at over $30. At the very least, I'll have spare parts for the other Chimei monitors I have
            Attached Files

            Comment

              #26
              Re: DAC-19M009 dead?

              Originally posted by papagoose View Post
              I'll have to look around for where to get a replacement, shipping to Australia comes out at over $30.
              ebay.com has selection with either free or reasonable shipping

              Search ebay for ea1532

              I see quantity = 2 for $1.20 with $4 for shipping to Canada.
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                #27
                Re: DAC-19M009 dead?

                Originally posted by retiredcaps View Post
                ebay.com has selection with either free or reasonable shipping

                Search ebay for ea1532

                I see quantity = 2 for $1.20 with $4 for shipping to Canada.
                Hahhah I was just looking at eBay when I saw your post! This is the one, yes?

                http://www.ebay.com.au/itm/IC-TEA153...#ht_1973wt_882

                If thats correct, I'll order it

                Comment

                  #28
                  Re: DAC-19M009 dead?

                  Originally posted by papagoose View Post
                  This is the one, yes?

                  http://www.ebay.com.au/itm/IC-TEA153...#ht_1973wt_882

                  If thats correct, I'll order it
                  Yes, that one.

                  However, wait 24 hours before ordering to see if PlainBill has anything to add to this discussion.
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                    #29
                    Re: DAC-19M009 dead?

                    A little Monday morning quarterbacking.
                    If I understand you correctly, with the logic board disconnected the power supply stays alive?
                    One more thing that should be checked is a problem with the inverter causing the power supply to shut down. Remove F200 it's the glass fuse in the center of the board,with that removed and the logic board installed recheck the voltages.
                    Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                    Comment

                      #30
                      Re: DAC-19M009 dead?

                      Originally posted by retiredcaps View Post
                      Yes, that one.

                      However, wait 24 hours before ordering to see if PlainBill has anything to add to this discussion.
                      The quick and easy test on the TEA1532 is to measure the voltage from pin 1 (Vcc) to pin 2 (Gnd) (DON'T use chassis ground). If the voltage is steady below 8 volts the chip is bad. If it's pulsing, the startup cap is bad, an output diode is shorted, or you have an excessive load on an output of the power supply. If it's in the 12-20 volt range the chip seems to be working properly.

                      This IC has the rectified mains voltage applied to pin 8, and is prone to failure.

                      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

                        #31
                        Re: DAC-19M009 dead?

                        Originally posted by alexanna View Post
                        A little Monday morning quarterbacking.
                        If I understand you correctly, with the logic board disconnected the power supply stays alive?
                        One more thing that should be checked is a problem with the inverter causing the power supply to shut down. Remove F200 it's the glass fuse in the center of the board,with that removed and the logic board installed recheck the voltages.
                        That was a good idea- when I removed F200 I still have the same problem (LED flashes once, no voltage on the connector pins to the logic board) so I guess that means its not the inverter?

                        Originally posted by PlainBill
                        The quick and easy test on the TEA1532 is to measure the voltage from pin 1 (Vcc) to pin 2 (Gnd) (DON'T use chassis ground). If the voltage is steady below 8 volts the chip is bad. If it's pulsing, the startup cap is bad, an output diode is shorted, or you have an excessive load on an output of the power supply. If it's in the 12-20 volt range the chip seems to be working properly.

                        This IC has the rectified mains voltage applied to pin 8, and is prone to failure.
                        With the logic board disconnected and no CCFLs, the voltage is about 10.5V and fluctuates a little (say +-0.2V). With the logic board connected and the CCFLs disconnected, the voltage is about 31V and steady the whole time

                        Comment

                          #32
                          Re: DAC-19M009 dead?

                          Originally posted by papagoose View Post
                          That was a good idea- when I removed F200 I still have the same problem (LED flashes once, no voltage on the connector pins to the logic board) so I guess that means its not the inverter?



                          With the logic board disconnected and no CCFLs, the voltage is about 10.5V and fluctuates a little (say +-0.2V). With the logic board connected and the CCFLs disconnected, the voltage is about 31V and steady the whole time


                          Interesting, since the max VCC for this chip is 20VDC. Are you placing your probes across pins 1 and 2 ?

                          Comment

                            #33
                            Re: DAC-19M009 dead?

                            Originally posted by jetadm123 View Post
                            Interesting, since the max VCC for this chip is 20VDC. Are you placing your probes across pins 1 and 2 ?
                            I checked the datasheet but I wasn't sure how to determine the orientation of the chip. I've marked which pins I measured as 1 and 2
                            Attached Files

                            Comment

                              #34
                              Re: DAC-19M009 dead?

                              Originally posted by papagoose View Post
                              I checked the datasheet but I wasn't sure how to determine the orientation of the chip. I've marked which pins I measured as 1 and 2
                              Not much help because the picture is too small to see the orientation of the chip clearly. I THINK those are the correct pins, but I can't be sure. One end of the IC may have a notch in it. With that end to the left, the left-most pin on the bottom row is pin 1, as you indicated. Sometimes pin 1 is indicated by a circle.

                              PlainBill
                              Last edited by PlainBill; 06-12-2011, 09:30 PM.
                              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

                                #35
                                Re: DAC-19M009 dead?

                                Originally posted by PlainBill View Post
                                Not much help because the picture is too small to see the orientation of the chip clearly. I THINK those are the correct pins, but I can't be sure. One end of the IC may have a notch in it. With that end to the left, the left-most pin on the bottom row is pin 1, as you indicated. Sometimes pin 1 is indicated by a circle.

                                PlainBill
                                Sorry, I've uploaded a better one. This is the same orientation as the previous photo (i.e. the two pins on the bottom left are the ones I measured)
                                Attached Files

                                Comment

                                  #36
                                  Re: DAC-19M009 dead?

                                  Originally posted by papagoose View Post
                                  This is the same orientation as the previous photo (i.e. the two pins on the bottom left are the ones I measured)
                                  I think it is correct because you can see the "white chalk outline" having a little bit of an indent.

                                  I wonder if a diode around that area is shorted? In figure 4 of the datasheet, that would be the diode feeding into Vcc (next to the secondary winding).
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                                  Comment

                                    #37
                                    Re: DAC-19M009 dead?

                                    Originally posted by retiredcaps View Post
                                    I think it is correct because you can see the "white chalk outline" having a little bit of an indent.

                                    I wonder if a diode around that area is shorted? In figure 4 of the datasheet, that would be the diode feeding into Vcc (next to the secondary winding).
                                    OK so in the previous photo, the visible diodes are the reddish cylinders D110, D109, D106 and something without a number? I've tested them, apart from D110 the multimeter gives about 600 (mV?) in one direction, and off scale on the other. D110 gives about 10 in both directions. So it seems to be shorted?

                                    Comment

                                      #38
                                      Re: DAC-19M009 dead?

                                      Originally posted by papagoose View Post
                                      D110 gives about 10 in both directions. So it seems to be shorted?
                                      It could be a false "in circuit" reading. D110 is right next to R132 which is a 15 ohm resistor.

                                      I would wait for PlainBill to see what he thinks. This is one area where I'm still learning and don't have hands on experience yet.
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                                      Comment

                                        #39
                                        Re: DAC-19M009 dead?

                                        Originally posted by papagoose View Post
                                        Sorry, I've uploaded a better one. This is the same orientation as the previous photo (i.e. the two pins on the bottom left are the ones I measured)
                                        Dang, that is one seriously good picture!!! It is clear enough I can follow the traces back to the rectifier. This IC uses a third form of identification for pin 1, it looks like the entire edge is chamfered. And you definitely measured pins 1 and 2.

                                        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

                                          #40
                                          Re: DAC-19M009 dead?

                                          Originally posted by PlainBill View Post
                                          Dang, that is one seriously good picture!!! It is clear enough I can follow the traces back to the rectifier. This IC uses a third form of identification for pin 1, it looks like the entire edge is chamfered. And you definitely measured pins 1 and 2.

                                          PlainBill
                                          Thanks What do you think about the diode?

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