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    mag 2200w lcd wont power on

    hello I have just gotten a lcd mag 2200w.
    the problem is the lcd when plug in doesnt power on, but the blue light shows up on the front and the speakers make a clicking or popping sound. like 3 or 5 clicking at a time then the lcd will try and come on but only for a second before doing the same thing? I think it might be some bad caps does anyone have any input for me before I start taking the thing apart?
    please and thanks

    #2
    Re: mag 2200w lcd wont power on

    The solid blue led indicates that the power board and logic board are likely to be working okay. When the screen goes black, this suggests something wrong on the inverter board.

    The standard procedure here is to post clear focused pictures of all your boards using the manage attachments functions so the pictures are attached to this forum. Please do not post inline because it slows down the loading of pages.

    After you have posted the pictures using manage attachments, we can suggest test points or see if the caps on the inverter board are known bad series.

    Comment


      #3
      Re: mag 2200w lcd wont power on

      Here a video of what it does. I have not gotten a chance to open it up yet. But it does that clicking sound from the two. Built in speakers. It clicks about 10 times. The blue light comes until for a few then lcd trys to display but that click happens then it powers off for a few second before doing the same thing again.
      http://youtu.be/-l7M8_KNtko this is the Youtube link. Let me know what you think
      thx again

      Comment


        #4
        Re: mag 2200w lcd wont power on

        Since your monitor isn't working, what's the holdup with taking it apart and posting some photos? Asking members to analyze a problem based on a video would be equivalent to asking a doctor to determine your illness based on a video of watching you cough. Please open it up and post some photos, so that members can properly analyze the problem.

        Comment


          #5
          Re: mag 2200w lcd wont power on

          Here is an idea of the sort of picture needed
          Attached Files

          Comment


            #6
            Re: mag 2200w lcd wont power on

            hey sorry I was about to goto sleep when i post it. will take it part soon and post some pictures i just have to run out and get some stuff done right now.

            Comment


              #7
              Re: mag 2200w lcd wont power on

              here the pic from what i can tell it looks likes something might have toasted on the board. anyways tell me what you guys think
              thanks


              [IMG] IMG00610-20110506-1438 by alicklee, on Flickr[/IMG][IMG] IMG00611-20110506-1439 by alicklee, on Flickr[/IMG]

              Comment


                #8
                Re: mag 2200w lcd wont power on

                Hi on the pic i have attached the 2 transistors i have marked up should be
                3055 6G
                I have had the same problem on this type of board (used in the Phillips php-X19)
                Change all the caps except the large one and replace the 2 transistors with
                MTD3055VLT4 N-Channel Power MOSFET 60V/12A
                Caps should be

                4 x 680uf 25v
                2 x 470uf 25v
                3 x 220uf 25v
                1 x 10uf 50v
                1 x 22uf 50v

                But do double check yours
                Attached Files
                Last edited by sabre504; 05-06-2011, 05:20 PM.

                Comment


                  #9
                  Re: mag 2200w lcd wont power on

                  So all I have to do is replace all those parts for it to fix the problem? Or is it just the two you circle that need to be changed. The cap on the other side look fine though?

                  Comment


                    #10
                    Re: mag 2200w lcd wont power on

                    As you have it apart you may as well do the caps

                    Once you have replaced these parts this may well fix the problem ,
                    if not it will have eliminated those parts and further tests can be done .
                    But i am pretty confident that the 2 parts i have highlighted are toasted
                    and that is the cause of your problem .

                    Also whereabouts in the world are so others can suggest suppliers for parts if you have any problems sourcing them

                    Comment


                      #11
                      Re: mag 2200w lcd wont power on

                      Ok I will try and get the parts for a local hardware store and if not maybe a used parts place or order on here. Thx I keep posted on how it goes

                      Comment


                        #12
                        Re: mag 2200w lcd wont power on

                        Doubt your local hardware store will stock the correct type of caps you will need .
                        Low esr caps needed
                        https://www.badcaps.net/forum/showth...0984#post10984

                        Caps can probably be purchased from this site
                        the mosfets are on ebay in the USA item num 400150288741

                        Comment


                          #13
                          Re: mag 2200w lcd wont power on

                          Ok cool thx I will keep updated once I get the part and let you know

                          Comment


                            #14
                            Re: mag 2200w lcd wont power on

                            Ok well u just finish checking out a few hardware stores and one of the guys that does repairs say that the board is done. The transformers are done and the one part of the board is toast. He said there is no point in getting parts and I'm better off ordering a new board. So I guess I will keep the old board for the parts cause all the cap are fine and order a board. I found a site in Asia that has em. Wish me luck. Thx for everyones input

                            Comment


                              #15
                              Re: mag 2200w lcd wont power on

                              Well if the transformers are shorted buying new ones isn't cost effective sorry i had assumed you had tested them if you have any luck with the site getting a new board let me know thanks

                              Comment


                                #16
                                Re: mag 2200w lcd wont power on

                                yeah I dont really have the tools to test it. but the fellow at the parts store said he fix tons of lcd and when he saw the board where the dark part is on the board he can tell me its toasted there and even if i put a new transformer on there it wont do much good.
                                also I tried to order from that site in asia but they are closed out.
                                so i guess i might luck out with a used board maybe this kind of sucks but I am not giving up on it yet.

                                I might still get the parts for the mosfit and if i can come across some cheap transformer maybe i will still attempt to fix it and see if maybe it was just that 4 parts and not the board?
                                well i keep updated
                                edit: so far no transformers
                                Last edited by alick; 05-07-2011, 07:40 PM.

                                Comment


                                  #17
                                  Re: mag 2200w lcd wont power on

                                  I think i will just get some parts and give it a go never know....
                                  crossing my finger and not my wires.
                                  i will get the mosfit in by Thursday i guess and give it a spin.

                                  Comment


                                    #18
                                    Re: mag 2200w lcd wont power on

                                    HI well all i can say is the boards i have repaired looked exactly the same as the one you have posted a pic of and doing the parts i said sorted it .

                                    If you have a multimeter you can test the transformers i have taken the following from Retiredcaps 2 seconds to black guide (might be worth reading the whole thing if you have not already done so

                                    4) Bad transformer
                                    ----------------------

                                    The transformer converts the low voltage into high voltage to drive the ccfls. These can be bad. You can test for open windings on the transformer by (with power off and unplugged)

                                    a) Number the pins on the transformers anyway you like
                                    b) black probe on pin 1, red on pin 2 - record ohm
                                    c) black probe on pin 1, red on pin 3 - record ohm
                                    d) black probe on pin 1, red on pin 4 - record ohm
                                    e) etc
                                    f) black probe on pin 1, red on pin last - record ohm
                                    g) black probe on pin 2, red on pin 3 - record ohm
                                    h) black probe on pin 2, red on pin 4 - record ohm
                                    i) etc
                                    j) black probe on pin 2, red on pin last - record ohm
                                    k) black probe on pin 3, red on pin 4 - record ohm
                                    l) etc
                                    m) finally, black probe on pin last-1, red on pin last - record ohm

                                    I'm guessing the secondaries should read 950 ohm (this will vary for different transformers). The primaries should read 1.3 ohm. Some will be 0L. If one secondary is 950ohm and the other is 750ohm, that would indicate a problem.

                                    This test is not exhaustive as it does not detect all faults. For that, you will need a ring tester to test the coils.
                                    Attached Files

                                    Comment


                                      #19
                                      Re: mag 2200w lcd wont power on

                                      ok well what I will do is go get the parts and try it and see if that will work. i mean you have fix it and had the same problem so I hope maybe i had the same problem and it will be an easy fix. I guess I should invest in a multimeter and a new solder iron(my old one I'm not sure if it works still.) if i going to be doing all these DIY repairs.
                                      well i will call the parts guy and order the mosfit and see about the cap even though they already told me the caps are fine.
                                      also i will read this guide you are talking about it seems to hold a lot of info
                                      thank i will keep posted with what happens.

                                      Comment


                                        #20
                                        Re: mag 2200w lcd wont power on

                                        Did he actually test the caps or just look at them ?

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