Westinghouse L2046NV

Collapse
X
Collapse
+ More Options
Posts
 
  • Time
  • Show
Clear All
new posts
  • frankNstein
    Member
    • Feb 2010
    • 35

    #1

    Westinghouse L2046NV

    Hello everyone I am new here and this is my first post. I have a Westinghouse L2046NV monitor and the backlight is not working. It has a Delta DAC-19M005 DF Rev 02A power supply/inverter board. I have replaced Q205, Q206, C204,CE101, CE109, CE103, CE104 and F200. I have 5 and 15 volts at CN5. When the monitor is turned on the green light comes on for about five seconds and then starts to blink. I have spent a lot of time on this monitor and have found that there is no drive to the Mosfets. It looks to me like the drive comes from U200 and is buffered with two transistors and then to the gate of the Mosfets. I haven't looked to see if I have anything from U200 because it and the buffer transistors are on the bottom of the board. I was hopping that someone had this before or happened to have a schematic of this board. Thank you for your help.
  • PlainBill
    Badcaps Legend
    • Feb 2009
    • 7034
    • USA

    #2
    Re: Westinghouse L2046NV

    Originally posted by frankNstein
    Hello everyone I am new here and this is my first post. I have a Westinghouse L2046NV monitor and the backlight is not working. It has a Delta DAC-19M005 DF Rev 02A power supply/inverter board. I have replaced Q205, Q206, C204,CE101, CE109, CE103, CE104 and F200. I have 5 and 15 volts at CN5. When the monitor is turned on the green light comes on for about five seconds and then starts to blink. I have spent a lot of time on this monitor and have found that there is no drive to the Mosfets. It looks to me like the drive comes from U200 and is buffered with two transistors and then to the gate of the Mosfets. I haven't looked to see if I have anything from U200 because it and the buffer transistors are on the bottom of the board. I was hopping that someone had this before or happened to have a schematic of this board. Thank you for your help.
    Read this faq: https://www.badcaps.net/forum/showthread.php?t=1868

    Now take pictures of both top and bottom of the board and attach them to your reply.

    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

    • frankNstein
      Member
      • Feb 2010
      • 35

      #3
      Re: Westinghouse L2046NV

      Here are the pictures of the boadr and yes I know that F200 is not on the board, I took it off during testing.
      Attached Files

      Comment

      • jetadm123
        Badcaps Legend
        • Feb 2010
        • 2169

        #4
        Re: Westinghouse L2046NV

        Hello "Frank"! After looking at your photo, it looks like your monitor uses the same power supply/inverter as the Westinghouse L1975NW. There's quite a long thread concerning this monitor at:

        https://www.badcaps.net/forum/showth...hlight=l1975nw


        Hopefully, you can get some good info from it. Please keep in mind that this thread covers the "AF" version versus your "DF" version and I'm not sure what the differences are.

        Comment

        • frankNstein
          Member
          • Feb 2010
          • 35

          #5
          Re: Westinghouse L2046NV

          Thank you for the link and all your help. What I am having trouble with is something more than this link. I have no drive to the Mosfets. I did this type of work for about thirty years and have all the equipment but am having trouble because I don't have a schematic of this board and I can't read the part number on the driver IC. I hope someone can help me find the schematic and I will post what I find after the repair is completed.

          Comment

          • PlainBill
            Badcaps Legend
            • Feb 2009
            • 7034
            • USA

            #6
            Re: Westinghouse L2046NV

            Originally posted by frankNstein
            Thank you for the link and all your help. What I am having trouble with is something more than this link. I have no drive to the Mosfets. I did this type of work for about thirty years and have all the equipment but am having trouble because I don't have a schematic of this board and I can't read the part number on the driver IC. I hope someone can help me find the schematic and I will post what I find after the repair is completed.


            Follow the link jetadm123 posted above. The identify the inverter controller and even provide a link to it's datasheet.

            As far as the FETs not having a drive signal, check the backlight control signal from the logic card.

            Finding schematics for these monitors can be very difficult. Quite often we have to depend on other's experience, then pay it forward. If I recall correctly, the identical power supply / inverter is used in an Acer AL1916W. That schematic might be available.

            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

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA

              #7
              Re: Westinghouse L2046NV

              Originally posted by PlainBill


              Follow the link jetadm123 posted above. The identify the inverter controller and even provide a link to it's datasheet.

              As far as the FETs not having a drive signal, check the backlight control signal from the logic card.

              Finding schematics for these monitors can be very difficult. Quite often we have to depend on other's experience, then pay it forward. If I recall correctly, the identical power supply / inverter is used in an Acer AL1916W. That schematic might be available.

              PlainBill
              My bad. The Acer AL1916W seems to use a different board.

              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

              • frankNstein
                Member
                • Feb 2010
                • 35

                #8
                Re: Westinghouse L2046NV

                PlainBill Thanks for the help. I will see what I can find with the Archer anyway, it might be close enough. If someone has a part number for U200 that would be a great help. I can't read the number on mine and that is where the drive comes from. I will do some more checking today.

                Comment

                • frankNstein
                  Member
                  • Feb 2010
                  • 35

                  #9
                  Re: Westinghouse L2046NV

                  PlainBill- My board is using a BIT3713 IC for the inverter control (U200). I couldn't find much information on it but found the data sheet for a BIT3193. I read somewhere that they are the same and I was hoping that you might know if that is true. Are they the same? Is the pin-out the same too? Thanks for all your help

                  Comment

                  • anno
                    Senior Member
                    • Sep 2007
                    • 140
                    • netherlands

                    #10
                    Re: Westinghouse L2046NV

                    does the ic getting power on vcc pin ? so look for voltage on the vcc pin. check that.
                    then check with scope if u200 drives the mosfets (if you have a scope). if there is voltage but no output maybe the ic is defect

                    Comment

                    • frankNstein
                      Member
                      • Feb 2010
                      • 35

                      #11
                      Re: Westinghouse L2046NV

                      I need to know if the BIT 3713 Nd the BIT 3193 are the same so I know what the pin-out is and then I can check all those things. Yes I do have a scope. Thanks for the help

                      Comment

                      • PlainBill
                        Badcaps Legend
                        • Feb 2009
                        • 7034
                        • USA

                        #12
                        Re: Westinghouse L2046NV

                        Originally posted by frankNstein
                        PlainBill- My board is using a BIT3713 IC for the inverter control (U200). I couldn't find much information on it but found the data sheet for a BIT3193. I read somewhere that they are the same and I was hoping that you might know if that is true. Are they the same? Is the pin-out the same too? Thanks for all your help
                        The information is covered in the other thread; I don't have personal experience. But as far as I know, they are identical; the part number was changed as part of the settlement of a copyright infringement case.

                        With the datasheet, an ohmmeter and the scope it should be very easy to verify the equivalence.

                        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

                        • frankNstein
                          Member
                          • Feb 2010
                          • 35

                          #13
                          Re: Westinghouse L2046NV

                          I found four open transistors allinthe VDD supply, on-off and holddown circuit of U200. I am not sure I am reading all the number on them but this is what I can see.W2k and P13. Do any of you know anything about these numbers and what I should use as replacements? These are surface mount and their board numbers are Q22,Q202,Q209 and Q110. Thanks for all your help.

                          Comment

                          • PlainBill
                            Badcaps Legend
                            • Feb 2009
                            • 7034
                            • USA

                            #14
                            Re: Westinghouse L2046NV

                            Originally posted by frankNstein
                            I found four open transistors allinthe VDD supply, on-off and holddown circuit of U200. I am not sure I am reading all the number on them but this is what I can see.W2k and P13. Do any of you know anything about these numbers and what I should use as replacements? These are surface mount and their board numbers are Q22,Q202,Q209 and Q110. Thanks for all your help.
                            Those are marking codes, and are the bane of the electronics tech. In general, if you know the manufacturer of the component you can identify the true part number. There are cross references, but they are hopelessly out of date. I checked both codes and came up blank.

                            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

                            • frankNstein
                              Member
                              • Feb 2010
                              • 35

                              #15
                              Re: Westinghouse L2046NV

                              PlainBill Thank you so much. I will keep checking.We're only working with about 8-10 volts and not much current so I think I can find something that will work. I'll keep you posted.

                              Comment

                              • HardHead
                                New Member
                                • Jun 2010
                                • 1

                                #16
                                Re: Westinghouse L2046NV

                                I found this tonight if anyone is interested.

                                http://www.avsforum.com/avs-vb/showthread.php?t=1113012

                                Comment

                                • dobber
                                  Senior Member
                                  • Jul 2008
                                  • 83

                                  #17
                                  Re: Westinghouse L2046NV

                                  I have a 19in widesreen Westinghouse, that had a problem like that. On mine, I found that I had a burnt out mini fuse on it going to one side of the back lighting causing it not to start. I just bypassed it do to the fact that there was a second one in line just down the chain a bit. It has worked for about 2 years so far. Sorry that I have no pics, it was long ago that I fixed it, but maybe it will help.

                                  Comment

                                  Related Topics

                                  Collapse

                                  • momaka
                                    HannStar Hanns-G HC194d LCD monitor repair
                                    by momaka
                                    Normally, I never post repairs this quick after I do them, because… I am usually very slow. But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
                                    03-15-2023, 10:17 PM
                                  • momaka
                                    Westinghouse L2210NW LCD monitor - bad caps repair
                                    by momaka
                                    Here's another LCD monitor repair: Westinghouse L2210NW.
                                    Quick specs: 22” CCFL backlit LCD, 1680x1050 max resolution (16:10 aspect ratio)

                                    I got it with a bunch of desktops PCs from a repair shop that was trying to free up space a few years ago. It seemed like a cheap monitor, so I didn't really care that much at first when I picked it up (and indeed it is, picture-wise.) But hey, free is free, so I can't complain. Moreover, it looked clean and the screen didn't have any significant scratches or blemishes.

                                    Pictures of the monitor outside/case after a brief...
                                    01-11-2021, 01:14 AM
                                  • ant3202
                                    HP 27es - LED monitor - Monitor Flashing On - Off
                                    by ant3202
                                    Hi Everyone

                                    Lately I am experiencing the deja-vu incident on one of the led monitor like this.
                                    https://www.badcaps.net/forum/troubl...lashing-on-off

                                    The monitor is HP 27es LED Monitor
                                    https://h30434.www3.hp.com/t5/Deskto...e/td-p/6804692

                                    The monitor will randomly blackout and display no signal and will recover again.
                                    Sometimes need to power and off again to restore the display but...
                                    03-20-2025, 07:30 PM
                                  • Rick_1234
                                    LG 23MP55HQ LED Monitor turns off after a few seconds or flickers.
                                    by Rick_1234
                                    Good evening, gentlemen.

                                    I have a problem with my monitor. It turns off after a few seconds or flickers. Shining a flashlight on the screen doesn't show any image, so I guess it's not the "2 seconds to dark" I read in the forum.

                                    To turn it back on, I have to press the power button twice. Then after a few seconds it turns off again or flickers. See video.
                                    https://drive.google.com/file/d/1L6S...ew?usp=sharing


                                    Things I tried

                                    - Bought a new AC adapter thinking that was the problem but the problem...
                                    06-22-2024, 04:44 PM
                                  • momaka
                                    Wise Wing F199 19'' LCD monitor - recapped
                                    by momaka
                                    Looking through my repair pictures and notes, it's been a long time since I posted anything in the LCD monitors section. So here goes that.

                                    I'm dedicating this thread to one of the very first LCD monitors I repaired (if not the first one), which was more than 10 years ago now. The monitor is a Wise Wing, model F199. It's a 19” CFL-backlit LCD. I got it for free off of Craigslist in 2009 from a guy, who said he bought it for cheap from Wallmart and the monitor worked only for a little less than 2 years before quitting.

                                    When I saw the Craigslist post, I wasn't...
                                    08-24-2020, 10:58 AM
                                  • Loading...
                                  • No more items.
                                  Working...