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    #1

    Lg 42pc3d-ue Bad Picture

    hi all,'
    check out pic of what i have
    this happened suddenly while tv was on
    the screen you see has no signal to it,
    so its only normal static, altho even that is darkened
    and it fades into total black at upper right

    the question is..
    is anyone certain of the fix?
    i saw another guy on here with same tv and his screen was still visible all the way across.
    the suggestion for him was a y sus board prob
    i talked to a guy about mine and he says maybe a z sus board or power sup prob...

    any way to know for sure????

    thanks,,,,

    1 more thing
    the tv doesnt seem to get warm when turned on and it will turn off by itself after maybe 10 minutes or so
    always seemed to be pretty warm when it was on before,, i think normal for plasme tvs
    but not sure how long it would take to get that warm
    i have back of tv removed and powered up without feeling any warming anywhere
    Attached Files
    Last edited by kolodza; 06-23-2010, 10:44 AM.
    Tags: None
    #2
    Re: Lg 42pc3d-ue Bad Picture

    1)the best way to find out which board ( y sus or z sus ) is you can hear them running when they are working. A dim picture can be the z sus ( the board on the right as you are looking at the back of the tv). A faulty y sus most of the time would be no picture or a momentary dim picture. I have not worked on this type of lg so the board layout may be different. You should be able to find something on scribd.com. I have found alot of lg on this website. Also look for fuses on y and z boards. A picture of the back of the tv showing the boards would be helpfull.

    2) Wait for plainbill or Wizard They may have worked on this type of l/g

    Cadiman

    Comment

      #3
      Re: Lg 42pc3d-ue Bad Picture

      I just found the other thread on Plainbill. Look for the white sticker on the upper left or right of the pdp it will give you the panel model number with a list of voltages. When you look up l/g on scribd.com you will need to scroll through to find your panel number. It will show you where to check for voltage on all of the boards. These boards are all over ebay.
      Cadiman

      Comment

        #4
        Re: Lg 42pc3d-ue Bad Picture

        If the lighted corner was in the lower right I would say it absolutely is the Z-sus. I had two sets with the same panel, the same symptom, and bad Z-sus boards. The first step is to open the set up and check for blown fuses on both Y-sus and Z-sus boards. If the clip-in fuse is blown, there is a short on the board, and either repair or replace it.

        If you have a scope, look at the output of the Z-sus and compare it to the pictures below. Note that the bad Z-sus has slow transitions and garbage imposed on the trace.

        Note there is someone on eBay who will repair these, and if you send him both he will give you a discount. There is also someone else who is selling the hybrids.

        PlainBill
        Attached Files
        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

          #5
          Re: Lg 42pc3d-ue Bad Picture

          heres a pic of plainbills, mine is almost exactly the same
          until i get my cardreader to work it will have to do
          Attached Files
          Last edited by kolodza; 06-23-2010, 09:52 PM.

          Comment

            #6
            Re: Lg 42pc3d-ue Bad Picture

            Originally posted by PlainBill
            If the lighted corner was in the lower right I would say it absolutely is the Z-sus. I had two sets with the same panel, the same symptom, and bad Z-sus boards. The first step is to open the set up and check for blown fuses on both Y-sus and Z-sus boards. If the clip-in fuse is blown, there is a short on the board, and either repair or replace it.

            If you have a scope, look at the output of the Z-sus and compare it to the pictures below. Note that the bad Z-sus has slow transitions and garbage imposed on the trace.

            Note there is someone on eBay who will repair these, and if you send him both he will give you a discount. There is also someone else who is selling the hybrids.

            PlainBill

            no, dont have scope and dont know what one is really but,
            i do see 2 very small fuses on each of the boards,
            i guess you check them with a tester ay? cuz their all white
            oy
            pretty unskilled ainna?
            i should have gone to school for this cuz i like it but.....

            Comment

              #7
              Re: Lg 42pc3d-ue Bad Picture

              Originally posted by kolodza
              no, dont have scope and dont know what one is really but,
              i do see 2 very small fuses on each of the boards,
              i guess you check them with a tester ay? cuz their all white
              oy
              pretty unskilled ainna?
              i should have gone to school for this cuz i like it but.....
              There are one or two (I disremember) on each board. Check them with a DMM on the 200 ohms range.

              I was just wondering about that. Do they even teach component level repair in electronics school anymore, or is it all board swapping?

              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

                #8
                Re: Lg 42pc3d-ue Bad Picture //withnew pics//

                havent checked fuses yet but heres all the new pics
                can anyone tell me whats what?
                oh, sorry about the bad pic quality, glare on these badlarrys are a bich
                plainbill, youre my hero so far, thanks
                Attached Files

                Comment

                  #9
                  Re: Lg 42pc3d-ue Bad Picture //withnew pics//

                  It could be the quality and darkness of the pic, but 3 caps look bloated on the power board just left the 2nd transformer (yellow block)?

                  To get better quality pics, take your tv closer to a window on a sunny day (or open your curtains) to let more light in.

                  Originally posted by kolodza
                  oh, sorry about the bad pic quality
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                  Comment

                    #10
                    Re: Lg 42pc3d-ue Bad Picture //withnew pics//

                    Originally posted by kolodza
                    havent checked fuses yet but heres all the new pics
                    can anyone tell me whats what?
                    oh, sorry about the bad pic quality, glare on these badlarrys are a bich
                    plainbill, youre my hero so far, thanks
                    1. Check the fuses. It's quick and easy. If any are blown, repair the board (probably the hybrid), or have the board repaired.

                    The board on the left is the Y-sus, the one on the right is the Z-sus. Z-sus is easy to pull and replace, Y-sus is more difficult.

                    Originally posted by retiredcaps
                    It could be the quality and darkness of the pic, but 3 caps look bloated on the power board just left the 2nd transformer (yellow block)?

                    To get better quality pics, take your tv closer to a window on a sunny day (or open your curtains) to let more light in.
                    Agreed, those caps look suspicious.

                    Or he could buy a real camera.

                    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

                      #11
                      Re: Lg 42pc3d-ue Bad Picture //withnew pics//

                      Originally posted by PlainBill
                      1. Check the fuses. It's quick and easy. If any are blown, repair the board (probably the hybrid), or have the board repaired.

                      The board on the left is the Y-sus, the one on the right is the Z-sus. Z-sus is easy to pull and replace, Y-sus is more difficult.



                      Agreed, those caps look suspicious.

                      Or he could buy a real camera.

                      PlainBill
                      not bad for a cell phone pic tho. right?
                      wife has camera on trip
                      ill follow with clarity that will knock yer sox off

                      Comment

                        #12
                        Re: Lg 42pc3d-ue Bad Picture //withnew pics//

                        what are boards in the middle top and middle lower?

                        and, are the long units on the left the buffers??

                        i love this stuff but im so ignorant
                        thanks
                        Last edited by kolodza; 06-25-2010, 11:30 AM.

                        Comment

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