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    #1

    Westinghouse Monitor Fading Colors

    Hey Guys: Enjoyed searching the forum this afternoon looking for a solution to my monitor issue, and alas - seems I may have another problem.

    This is a Westinghouse L1916HW that I've had for a couple of years with a Darfon B092-XXX inverter board. It worked beautifully for what it is until about a week ago when I powered it up ... The screen was washed out with faded colors and a green tinge overall. There seems to be a shimmer to the display as well. The image is clear enough to be legible but I can't use it because it kills my eyes. I spend 12 - 14 hrs a day on this thing for work.

    The monitor is hooked up to a HP Pavilion d4vt-1020usa laptop with a perfect display.

    I took the monitor apart and see no issues with blown caps although there is discoloration under a Nikos Mosfet. I intend to replace all the caps, and that Mosfet if I can figure out how to find one, but ...

    Does anyone here think that there may be another issue with this monitor exhibiting what I described above? Looking forward to your feedback.

    Cheers,
    David
    Tags: None
    #2
    Re: Westinghouse Monitor Fading Colors

    Welcome to the forum! Please post some clear photos of the power supply, logic board and display per the link below:

    https://www.badcaps.net/forum/showthread.php?t=1868


    Possible problems:

    Caps. If a filter cap has failed, it might be putting out an unstable voltage to the logic card, which could cause unusual behavior.

    Logic card could be bad.

    LCD panel could be bad.

    Loose/bad ribbon cable connecting logic card to lcd panel.

    Post the photos first and give people a chance to look it over.
    Last edited by jetadm123; 09-12-2010, 09:20 PM.

    Comment

      #3
      Re: Westinghouse Monitor Fading Colors

      Originally posted by jetadm123 View Post
      Post the photos first and give people a chance to look it over.
      Also, please state if you have a multimeter and if you know how to use one to measure voltage and resistance.

      PS. Don't post pictures inline as they slow down the loading of pages.
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        #4
        Re: Westinghouse Monitor Fading Colors

        Hi guys. I do have a multi-meter but will likely need a little coaching on how to use the dang thing. I'm attaching the pics. There is a mosfet (Nikos P2804ND5G) that is a little suspicious that is located next to the green "Tested OK" sticker. I only say that because the back side of the board is discolored in that area.
        Attached Files

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          #5
          Re: Westinghouse Monitor Fading Colors

          Originally posted by DavidTomen View Post
          Hi guys. I do have a multi-meter but will likely need a little coaching on how to use the dang thing. I'm attaching the pics. There is a mosfet (Nikos P2804ND5G) that is a little suspicious that is located next to the green "Tested OK" sticker. I only say that because the back side of the board is discolored in that area.
          The P2804ND5G mosfet is responsible for generating a sine wave voltage, which is required by the inverter tranformer to generate the high AC voltage required by the backlights. This mosfet does run HOT and since the board itself is being used as a heatsink, it will get discolored over time. So, unless you're having trouble with the backlights, leave it alone.

          I suggest you piece the boards back together and start taking some voltage measurements at the 8-prong plug. Measure for the 5V and 12V outputs. As for the logic (video) board, one of the larger 3-legged chips on the right side of the board is a voltage regulator, probably marked XX1117-33. See if you can locate it.

          Comment

            #6
            Re: Westinghouse Monitor Fading Colors

            Thanks for the quick reply. One thing that I neglected to mention. I hate my multimeter. What is a good, inexpensive multimeter that I can pick up at Sears or Home Depot?

            Comment

              #7
              Re: Westinghouse Monitor Fading Colors

              Originally posted by DavidTomen View Post
              There is a mosfet (Nikos P2804ND5G) that is a little suspicious that is located next to the green "Tested OK" sticker. I only say that because the back side of the board is discolored in that area.
              Some discoloration is normal due to heat from the mosfet.

              Put your multimeter on DC Voltage. If you have a manual range one, put it on 20V DC.

              Put your black probe in COM and red probe in voltage.

              Put your black probe onto a ground screw on the logic board. Put your red probe on the power to logic board connector. Record voltage on each pin (or leg) and report them. At least one of them should be stable 5V DC.

              Your logic board picture is low resolution, but it looks like there are 2 voltage regulators on the far right hand side. They will be designated with the letter U.

              Again, with black probe on the ground screw, measure each pin on the voltage regulator. Also, we need the part number for each regulator.

              Report all voltage readings.
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                #8
                Re: Westinghouse Monitor Fading Colors

                Originally posted by DavidTomen View Post
                he screen was washed out with faded colors and a green tinge overall. There seems to be a shimmer to the display as well.
                Does this washed out color start immediately after power on? Or does it happen after a few minutes or use?
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                  #9
                  Re: Westinghouse Monitor Fading Colors

                  The washed out color starts immediately after power on. It get progressively worse after about a minute and then stabilizes. Everything is legible but faded. And there seems to be a shimmer, or - I don't know how to explain it. Flickering over the entire screen?

                  Comment

                    #10
                    Re: Westinghouse Monitor Fading Colors

                    Originally posted by DavidTomen View Post
                    The washed out color starts immediately after power on. It get progressively worse after about a minute and then stabilizes. Everything is legible but faded. And there seems to be a shimmer, or - I don't know how to explain it. Flickering over the entire screen?
                    Some of the symptoms (flickering) you describe can be caused by bad caps. If you want to take a chance (without having done any testing) go ahead and replace them (except for the large one). This board uses very few caps and would cost you under $10 (including shipping). No guarantees that this will solve the problem.
                    Last edited by jetadm123; 09-14-2010, 10:03 AM.

                    Comment

                      #11
                      Re: Westinghouse Monitor Fading Colors

                      Originally posted by DavidTomen View Post
                      Flickering over the entire screen?
                      For flickering, there is a small chance your problem is like this one (post #140)

                      https://www.badcaps.net/forum/showth...?t=9343&page=7

                      Replacing the large cap for Aruba worked because of fluctuating voltage on the big cap. And the big cap had very poor uF (0).
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                        #12
                        Re: Westinghouse Monitor Fading Colors

                        Logic Board Voltage Regulators:

                        50117
                        K-G
                        73822

                        Pin 1: 0V
                        Pin 2: 3.3V note: is not connected as the other two are
                        Pin 3: 4.74V

                        L1117LG-1.8
                        XB52J0286

                        Pin 1: 3.3V
                        Pin 2: 1.8V
                        Pin 3: 0V

                        Logic Board Pin Connectors:

                        Top row:

                        Pin 1: 4.99V
                        Pin 2: 0V
                        Pin 3: 0V
                        Pin 4: 0.04V

                        Bottom row:

                        Pin 1: 4.99V
                        Pin 2: 4.99V
                        Pin 3: 0V
                        Pin 4: 0.06V

                        Comment

                          #13
                          Re: Westinghouse Monitor Fading Colors

                          All the voltages for the connector pins and voltage regulator seem normal. 5V, 3.3, and 1.8 are fairly common for a logic board. Replacing the caps might solve your problem, but it is only a guess. I have no hard evidence.

                          For a multimeter, I like my Meterman 15XP, but a similar one (Meterman 30XR) can be found on ebay.com for $12 USD + shipping.

                          http://cgi.ebay.com/Meterman-30XR-A-...item5889bc8cf5

                          Dave L Jones, at the eevblog, does a $50 multimeter shootout. It is 50+ minutes and I love his rants!

                          http://www.youtube.com/watch?v=ZoeUgMFLyAw

                          edit: Having first hand experience, do NOT buy any of those cheap DT830B like cheap < $5 multimeters on ebay.
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                            #14
                            Re: Westinghouse Monitor Fading Colors

                            Thanks for the advice on the multimeters. I'll be ordering the caps today and report back once those arrive and are installed.

                            Cheers,
                            David

                            Comment

                              #15
                              Re: Westinghouse Monitor Fading Colors

                              Originally posted by DavidTomen View Post
                              Thanks for the advice on the multimeters. I'll be ordering the caps today and report back once those arrive and are installed.
                              Just re-read post #11 re big cap. If it makes sense, you might want to include that in your cap order.

                              PS. I have no experience with the seller on ebay for the Meterman 30XR. Meterman, is a brand "name" in the multimeter world.
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                                #16
                                Re: Westinghouse Monitor Fading Colors

                                Originally posted by DavidTomen View Post
                                Thanks for the advice on the multimeters. I'll be ordering the caps today and report back once those arrive and are installed.

                                Cheers,
                                David
                                Make sure you order low-esr caps.

                                Comment

                                  #17
                                  Re: Westinghouse Monitor Fading Colors

                                  That I am.

                                  Comment

                                    #18
                                    Re: Westinghouse Monitor Fading Colors

                                    I rec'd and installed all the caps with Panasonic except for the big one. I expect that one to arrive in the next few days.

                                    The flickering seems to have disappeared from the display, but the colors are still washed out. This happens as soon as the monitor is powered on.

                                    I've tried adjusting colors, brightness, etc. with the buttons on the side of the monitor as there does not seem to be a way to make adjustments using the laptop with a VGA connection. I have ordered a DVI-D to HDMI cable from Amazon which I hope will allow me to use the controls offered by the AMD M880G with ATI Mobility Radeon HD 4200 in the laptop.

                                    I have a feeling that adjusting the controls is not the issue. Anyone got any other ideas?

                                    Cheers,
                                    David

                                    Comment

                                      #19
                                      Re: Westinghouse Monitor Fading Colors

                                      Originally posted by DavidTomen View Post
                                      I rec'd and installed all the caps with Panasonic except for the big one. I expect that one to arrive in the next few days.
                                      Other than replacing the big cap, did you try another VGA cable or another source to rule out those as suspects?
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                                        #20
                                        Re: Westinghouse Monitor Fading Colors

                                        I tried in on my wife's Dell desktop PC which uses a Dell LCD monitor. The display remained the same.

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