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Panasonic THL42U20A Backlight But No Picture

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    #1

    Panasonic THL42U20A Backlight But No Picture

    I have a Panasonic THL42U20A that powers on but does not shows anything on the screen. All you can see is the backlight behind the LCD. When you press the AV button you see the backlight flash slightly suggesting the main board is operating normally. Does this seem like a T-Con fault?
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    #2
    Re: Panasonic THL42U20A Backlight But No Picture

    can you play a source through it ie a dvd etc if so can you see a faint picture on the screen with a flashlight aimed at the lcd you may have to try various angles also have tyo tested the voltage on either side of the t con fuse you may want to post some pictures up of the boards in your set as well.

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      #3
      Re: Panasonic THL42U20A Backlight But No Picture

      Originally posted by vinceroger69 View Post
      can you play a source through it ie a dvd etc if so can you see a faint picture on the screen with a flashlight aimed at the lcd you may have to try various angles also have tyo tested the voltage on either side of the t con fuse you may want to post some pictures up of the boards in your set as well.
      It's difficult to do that since I don't actually know what input it's on. Wouldn't that only work if the LCD was working but the backlight wasn't?

      I just checked the T-Con fuse and it's fine. Funny the T-Con is actually made by LG which might mean the panel is too. The chip itself on the T-Con may be bad do you think?

      I can upload images if you need them but I don't think they really show much.

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        #4
        Re: Panasonic THL42U20A Backlight But No Picture

        but if you play a source you may hear sound? as your flicking through source. so your saying the backlight is lit but no picture at all?

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          #5
          Re: Panasonic THL42U20A Backlight But No Picture

          Once pictures are posted fuse on t-con can be highlighted and tested.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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            #6
            Re: Panasonic THL42U20A Backlight But No Picture

            Originally posted by vinceroger69 View Post
            but if you play a source you may hear sound? as your flicking through source. so your saying the backlight is lit but no picture at all?
            Oh right of course, I'll re-install the T-con and do that now.

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              #7
              Re: Panasonic THL42U20A Backlight But No Picture

              Quite frustrating I can't seem to get audio out of it. I'm sure it's working though it could be muted or something I actually just sold the 37" version of this the other day I could of used it as a guide.
              Last edited by max1636; 01-02-2014, 07:41 AM.

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                #8
                Re: Panasonic THL42U20A Backlight But No Picture

                Replaced T-Con board today with no difference. Replace main board then? Are there any points on the board I can test?

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