Chimei DAC-19M009 Power Supply problems

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  • cds1984
    New Member
    • Jun 2011
    • 2

    #61
    Re: Chimei DAC-19M009 Power Supply problems

    Thanks for the fast response... and I do mean fast!

    Comment

    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA

      #62
      Re: Chimei DAC-19M009 Power Supply problems

      Originally posted by cds1984
      Thanks for the fast response... and I do mean fast!
      De Nada.

      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

      • ntehicks
        Badcaps Veteran
        • Mar 2011
        • 272
        • United States

        #63
        Re: Chimei DAC-19M009 Power Supply problems

        Chimei DAC-19M009 Power Supply problems
        I have the same problem with my power supply. I have tested and the fuse right under the power is blown. I have also tested the bridge rectifier it is bad. I have replaced both and still the fuse blows. I have tested the P10NK60ZFP and it tests good. my question is does anyone know what the transformer should test? the label on the pcb is LF100

        Comment

        • cnservices
          New Member
          • Sep 2011
          • 2

          #64
          Re: Chimei DAC-19M009 Power Supply problems

          I've recently acquired the VX2235WM monitor with the DAC-19M009. My issue is no power, no LED light. I've read through this thread and tried mostly everything in my ability. I have done electronics years ago in the Navy, but a little rusty on the soldering. Here's what I've done so far:

          Visual Inspection - no leaking/bulging caps, no noticeable solder issues
          Tested F200 and and F101 fuses -good
          Tested the big cap (400V 120uF) - good
          MOSFETS tested good
          Removed the startup cap and tested - good
          Bridge Rectifier tested good
          Tested the pins connecting to the logic board, no 5V to be found.....

          Not sure where to look next. Please bear in mind I'm waaaay out of practice with this, so you may get a response of "huh" or "how do I do that"

          Thanks for any help you can offer
          Attached Files

          Comment

          • Rtech
            Badcaps Legend
            • Jul 2010
            • 1095

            #65
            Re: Chimei DAC-19M009 Power Supply problems

            Measuring the Voltage across the large cap is the first thing to check, and should be about 1.4 times the AC input voltage,,although the measurement will be DC volts.If that is fine, then on the bottom of the board is an 8 pin SMPS chip...find the Datasheet,and check what voltages you have particularly the Vcc pin.

            Comment

            • RethoricalCheese
              Badcaps Legend
              • Mar 2013
              • 1514
              • Estonia

              #66
              Re: Chimei DAC-19M009 Power Supply problems

              Having a problem with the same board or maybe even with the other board.
              It had bad caps so I changed them. Got the monitor working. A week later it did not work anymore. When plugged in, there is a clicking sound and 2 LED lights in front are blinking (I could barely see it) in the same tact as the clicking sound.

              There is no clicking sound when the other board is not connected.

              I tested out large cap - OK, rectifier - OK, SMPS has 11.7V - OK (according to datasheet), 13.8V - OK, 5v - OK. Removed F200 - still same problem.
              All caps have been replaced.

              Taking in mind this information, is the problem hidden in power supply board or logic board/controller or whatever you call that.

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #67
                Re: Chimei DAC-19M009 Power Supply problems

                Boss - what monitor/model is it on - the bulbs and wiring on some chimei monitors tend to burn up.
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • RethoricalCheese
                  Badcaps Legend
                  • Mar 2013
                  • 1514
                  • Estonia

                  #68
                  Re: Chimei DAC-19M009 Power Supply problems

                  While I tested, I had no LCD panel even connected. Only the power supply board, controllerboard and buttonboard. Nothing else.

                  The model in question is VX2235wm

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #69
                    Re: Chimei DAC-19M009 Power Supply problems

                    Without bulbs connected the powersupply/inverter will go into protection and never start.
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • RethoricalCheese
                      Badcaps Legend
                      • Mar 2013
                      • 1514
                      • Estonia

                      #70
                      Re: Chimei DAC-19M009 Power Supply problems

                      Yes, I am aware of that but it has nothing to do with the problem at the moment. The problem is that there is a certain clicking sound and it does not start up (with or without CCFL-s connected, it doesn´t really matter)

                      Comment

                      • selldoor
                        Slow Learner
                        • Dec 2010
                        • 7870

                        #71
                        Re: Chimei DAC-19M009 Power Supply problems

                        Hmm, so are you sure the ccfls are good? if one is bad again the protection would kick in.
                        What make/series of caps did you use as replacements, and did you replace the 22uf50v startup cap - what voltage do you get across it?
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment

                        • RethoricalCheese
                          Badcaps Legend
                          • Mar 2013
                          • 1514
                          • Estonia

                          #72
                          Re: Chimei DAC-19M009 Power Supply problems

                          I am not 100% sure but I will worry about that later. I am 100% sure that one of the boards is faulty.

                          As a replacement I used leaguer and jamicon caps, which have been working before too (I have fixed 100-200 LCD-s using these caps)

                          I replaced 22uF 50V cap with 33uF 50V cap and the problem persisted.
                          Voltage across that cap is 12.5V

                          When I removed 5V rail fuse for testing, there was no clicking sound anymore while I had controllerboard connected. Just letting you know, maybe it helps with something.
                          Last edited by RethoricalCheese; 03-03-2013, 04:42 AM.

                          Comment

                          • selldoor
                            Slow Learner
                            • Dec 2010
                            • 7870

                            #73
                            Re: Chimei DAC-19M009 Power Supply problems

                            Ok - did you try jump starting - Can you find a pin labelled pson or blon or on/off on the main board connector. with the main board disconnected but with the lamps plugged in,
                            get a 500ohm resistor and jump the 5v pin to the pson or blon pin Switch on the mains power and see if the lamps come on ( may also need a resistor jumper to Blon.)
                            Please upload pictures using attachment function when ask for help on the repair
                            http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

                            • RethoricalCheese
                              Badcaps Legend
                              • Mar 2013
                              • 1514
                              • Estonia

                              #74
                              Re: Chimei DAC-19M009 Power Supply problems

                              Just tried jump starting. The lights turn on for half a second and go back off.

                              The lamps I used are taken from another monitor and are in 100% working condition.

                              Comment

                              • Amraks
                                Badcaps Veteran
                                • Nov 2011
                                • 724
                                • Australia

                                #75
                                Re: Chimei DAC-19M009 Power Supply problems

                                this was what mine was doing.

                                Haven't fixed it as I am stuck with getting that cap 220uf 50v cap the trace was lifted. having trouble finding where its meant to go on the negative side.

                                pretty sure positive lead traces to above zener diode.

                                Comment

                                • selldoor
                                  Slow Learner
                                  • Dec 2010
                                  • 7870

                                  #76
                                  Re: Chimei DAC-19M009 Power Supply problems

                                  The Boss
                                  Ok - how about testing the inverter transformers - see here
                                  https://www.badcaps.net/forum/showpo...68&postcount=6

                                  Is your board the same ( I am not certain those are the secondaries but try there first.
                                  Please upload pictures using attachment function when ask for help on the repair
                                  http://www.badcaps.net/forum/showthread.php?t=39740

                                  Comment

                                  • selldoor
                                    Slow Learner
                                    • Dec 2010
                                    • 7870

                                    #77
                                    Re: Chimei DAC-19M009 Power Supply problems

                                    The Boss
                                    As you see Amraks has a problem -If your board is the same any chance you could take a detailed picture of the yellow box area in the picture in this post
                                    https://www.badcaps.net/forum/showpo...0&postcount=39
                                    Please upload pictures using attachment function when ask for help on the repair
                                    http://www.badcaps.net/forum/showthread.php?t=39740

                                    Comment

                                    • RethoricalCheese
                                      Badcaps Legend
                                      • Mar 2013
                                      • 1514
                                      • Estonia

                                      #78
                                      Re: Chimei DAC-19M009 Power Supply problems

                                      Originally posted by Amraks
                                      this was what mine was doing.

                                      Haven't fixed it as I am stuck with getting that cap 220uf 50v cap the trace was lifted. having trouble finding where its meant to go on the negative side.

                                      pretty sure positive lead traces to above zener diode.
                                      I am not sure if the picture helps so I tested it instead.

                                      Positive side is connected with D109 and R133, negative side is connected with C121 and R144.

                                      Positive side rail should go underneath a diode also.
                                      Last edited by RethoricalCheese; 03-03-2013, 05:49 AM.

                                      Comment

                                      • RethoricalCheese
                                        Badcaps Legend
                                        • Mar 2013
                                        • 1514
                                        • Estonia

                                        #79
                                        Re: Chimei DAC-19M009 Power Supply problems

                                        Originally posted by selldoor
                                        The Boss
                                        Ok - how about testing the inverter transformers - see here
                                        https://www.badcaps.net/forum/showpo...68&postcount=6

                                        Is your board the same ( I am not certain those are the secondaries but try there first.
                                        Transformer pins marked S2 and S4 in your picture are not connected with anything

                                        725 ohm between S1 and S3 if that might be important to know.
                                        Last edited by RethoricalCheese; 03-03-2013, 05:51 AM.

                                        Comment

                                        • selldoor
                                          Slow Learner
                                          • Dec 2010
                                          • 7870

                                          #80
                                          Re: Chimei DAC-19M009 Power Supply problems

                                          Each transformer has two pins which should read ( probably as you say around 725 ohms) I just guessed which pins and was wrong.
                                          To find out you need to number the pins in your head then test 1 to2 1 to 3 1 to4 1 to 5
                                          and so on then 2 to3 2 to4 2 to 5 :: 3 to 4 3 to 5 3 to6 and so on until you find which are the secondary pins on one transformer then just check those pins on the other.

                                          As one of the pins I marked that measures 725 ohms use that as pin 1 and test it against other pins on the same transformer and let us know.
                                          Please upload pictures using attachment function when ask for help on the repair
                                          http://www.badcaps.net/forum/showthread.php?t=39740

                                          Comment

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