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    #1

    Sharp LCD

    After telling my buddy about this site, and trying to fix my LCD. He wants me to take a shot at his Sharp LC-26D43U That doesn't run properly untill it warms up. Picture blinks in and out. I'm guessing I need to go through and re-solder it.

    Menessis
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    #2
    Re: Sharp LCD

    That would definitely be a first step. And of course, checking for bad caps.
    36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

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      #3
      Re: Sharp LCD

      Originally posted by Menessis View Post
      He wants me to take a shot at his Sharp LC-26D43U That doesn't run properly untill it warms up. Picture blinks in and out.
      Sounds like bad caps.

      Post pictures as well.
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        #4
        Re: Sharp LCD

        Ya I will put a picture up. But first things first. Get my LCD going right!

        Menessis

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          #5
          Re: Sharp LCD

          OK here we go again.

          This Sharp display isn't working. Untill it warms up for about 20 minutes and seems to work fine. If you tap the case you can see the menu's a bit but then it goes again. Once warmed up you can tap the case with no effect.

          Any ideas?
          Attached Files
          Last edited by Menessis; 12-29-2010, 08:46 PM.

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            #6
            Re: Sharp LCD

            OK while reading some other posts I see references to "T-con board ". What is it?

            Menessis

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              #7
              Re: Sharp LCD

              Originally posted by Menessis View Post
              Untill it warms up for about 20 minutes and seems to work fine.
              We need pictures of the inside!!! PICTURES!!!

              Taking 20 minutes to warm before it works sounds like another capacitor issue. As the temperature rises the ESR (ohms) of the capacitor drops.
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                #8
                Re: Sharp LCD

                OK pictures. I had to wait untill today for some day light to get a good picture without the flash.
                Attached Files

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                  #9
                  Re: Sharp LCD

                  Originally posted by Menessis View Post
                  OK pictures.
                  Can you list the electrolytic capacitors listed on the inverter and power board? Can you list it like this?

                  Board designation, uF, V, series

                  For example

                  C770 - 330uF 220V, KXJ

                  It looks like all the caps are made by United Chemi-con. They generally make good caps, but the KZG is not recommend as per

                  https://www.badcaps.net/forum/showthread.php?t=2280

                  Additionally, caps do not have to bloat like in your TV in order to be bad. The 8 caps on the left hand side of the power board could be dry from sitting next to the diodes which put out a lot of heat.
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                    #10
                    Re: Sharp LCD

                    Some clarification questions.

                    1) On the main board (green) what is behind that heat shield?

                    2) When the TV is warming up for 20 minutes, does it display the picture in post post #5?

                    3) After 20 minutes and completely warm, does the picture look normal then?
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                      #11
                      Re: Sharp LCD

                      Originally posted by Menessis View Post
                      OK while reading some other posts I see references to "T-con board ". What is it?
                      A T-con board is a timing control board. I believe this board is usually "in between" the main board (green) and the panel board. It would help to get an overall picture of the entire back of the TV so we can see all the boards in relation.

                      That way, we can see where the t-con board is.

                      This is a picture of my friend's LG LCD

                      https://www.badcaps.net/forum/attach...7&d=1290038928

                      The main green board connects to the t-con via top cable. You can barely see the t-con hidden underneath the metal shield.

                      edit: In his case the problem was the t-con board. However, his symptoms were fuzzy lines and they were present from power on and never cleared up.
                      Last edited by retiredcaps; 12-30-2010, 10:41 AM.
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                        #12
                        Re: Sharp LCD

                        OK behind the heat shield are a pair of what looks like "processors".

                        During the start up warm up the display could be just about anything. I didn't have a source hooked up. I pushed the menu button and it showed that pic in #5.
                        Yes I plugged in the camera and the picture is fine once it warms up. I shut it off for about 5 minutes and then tried it. The picture was already starting to degrade. Came back quickly though.

                        I will make the list of caps if I can read them. But I can't do it untill tomorrow. I'm off to work right now.

                        Thanks for the help so far.

                        Menessis

                        Comment

                          #13
                          Re: Sharp LCD

                          Originally posted by Menessis View Post
                          I'm guessing I need to go through and re-solder it.
                          Anything obviously poorly soldered on the backside of the boards?
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                            #14
                            Re: Sharp LCD

                            I haven't got that far to look behind yet. Does seem strange that if I tap on it there is a change in the display.

                            Menessis

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                              #15
                              Re: Sharp LCD

                              Originally posted by Menessis View Post
                              I haven't got that far to look behind yet. Does seem strange that if I tap on it there is a change in the display.

                              Menessis
                              When I first started in this area, I found this youtube video on how to fix plasmas

                              http://www.youtube.com/watch?v=0ykPsV2voYU

                              "tapping" is not in my troubleshooting kit.
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                                #16
                                Re: Sharp LCD

                                Originally posted by retiredcaps View Post
                                The 8 caps on the left hand side of the power board could be dry from sitting next to the diodes which put out a lot of heat.
                                Possible correction? Upon closer examination, they look like fets/power transistors instead of diodes. Hard to tell as pics are slightly out of focus.
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                                  #17
                                  Re: Sharp LCD

                                  OK a list of caps.

                                  2 x 330uf @ 220v the two large ones on there sides
                                  4 x 1000uf @ 25v 4 bottom ones beside heat sink
                                  3 x 680 uf @ 35v 3top ones beside heat sink
                                  1 x 33uf @ 350v
                                  1 x 330 uf @ 35v
                                  1 x 22uf @ 50v
                                  1 x 100uf @ 35v

                                  6 x 220uf @ 35v these are on the other board

                                  They are all KY except for the two big ones on there side which are KXJ.

                                  Menessis

                                  Comment

                                    #18
                                    Re: Sharp LCD

                                    remove the heat sink on the main board, check if there is any gammy thing found on the board. If yes, remove and clean it.
                                    Also check if the heat transfer pad is all dried up.

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                                      #19
                                      Re: Sharp LCD

                                      Check for "gammy"? Do you mean "Gummy" ? Dried up grease? on the heat sink?

                                      Menessis

                                      Comment

                                        #20
                                        Re: Sharp LCD

                                        Originally posted by Menessis View Post
                                        During the start up warm up the display could be just about anything. I didn't have a source hooked up. I pushed the menu button and it showed that pic in #5.
                                        Yes I plugged in the camera and the picture is fine once it warms up. I shut it off for about 5 minutes and then tried it. The picture was already starting to degrade. Came back quickly though.
                                        Your description above sure sounds like dried out caps with high ESR. Once they warm up, the cap's ESR drops.

                                        On the other hand, it could also be a component or components that have potentially poor soldering and changes behaviour once the TV warms up.

                                        Right now, I would guess it is 60/40 in favour of caps.

                                        The "cheapest" solution would be to inspect all the solder joints with a magnifying glass on the power and inverter board and touch up/reflow anything that looks suspect.

                                        If that doesn't work, then I would ask friends to see if they have an ESR meter that you can borrow to test the existing UCC KY caps.

                                        If that doesn't work, ask your friend if he is willing to spend probably $25 CDN to buy all new caps for the power and inverter to fix this TV. No guarantees the new caps will fix this problem though. This one wasn't as "easy" as your TV fix.

                                        It looks like this TV was made in 2007. IF the caps are at fault, it is disappointing to see UCC make bad caps. OR this TV could run very hot and have poor heat dissipation and that will kill any quality cap?

                                        Let us know which way you want to proceed.
                                        Last edited by retiredcaps; 12-31-2010, 02:38 AM.
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