Toshiba 40L220U 40" LCD TV screen image goes away

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  • keepitgrn
    New Member
    • May 2013
    • 2
    • USA
    #1

    Toshiba 40L220U 40" LCD TV screen image goes away

    Tried to do a search for these problems in the forum but couldn't find anything.

    Bought this TV about six months ago and here are the symptoms I'm experiencing:

    - The TV turns on and will work great for a random period of time, could be 45 minutes or 1 1/2 hours, then the display with go black.
    - I'll shut the TV off and then immediately back on and the Toshiba logo might flash for a second, then the display goes dark again.
    - If I look closely though I can see the TV image it's just very dark, almost like no backlight
    - I can shut the TV off overnight than in the morning the same thing will happen starting at the top of this list.

    From the little research I've done, this seems like it could be the T CON board, but have no idea where to start troubleshooting. I can post pictures tomorrow after I have a chance to take the back panel off.

    Any help would be greatly appreciated. I do have some experience replacing bad capacitors in computer monitors, its probably wishful thinking that a TV repair will be as easy as a monitor repair. I just hate the idea of just throwing something away that can potentially be repaired.
    Tags: None
    • truep
      Badcaps Veteran
      • Aug 2010
      • 373
      • USA
      #2
      Re: Toshiba 40L220U 40" LCD TV screen image goes away

      if you can see the image, it isn't the TCON. Most likely the inverter.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Toshiba 40L220U 40" LCD TV screen image goes away

          You need to look at the screen in the dark room to see if the backlights are working or not first. It is not under warranty for 6 months old TV?
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • keepitgrn
              New Member
              • May 2013
              • 2
              • USA
              #4
              Re: Toshiba 40L220U 40" LCD TV screen image goes away

              Originally posted by budm
              You need to look at the screen in the dark room to see if the backlights are working or not first. It is not under warranty for 6 months old TV?
              Well I bought it used, so didn't even think about the warranty, I'll check into that.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Toshiba 40L220U 40" LCD TV screen image goes away

                  You bought it used 6 months ago or you bought it from someone who was selling it used but it was only a few months old?
                  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.

                    Comment

                    • cheapie
                      null
                      • Jul 2010
                      • 849
                      • USA
                      #6
                      Re: Toshiba 40L220U 40" LCD TV screen image goes away

                      Originally posted by budm
                      You need to look at the screen in the dark room to see if the backlights are working or not first. It is not under warranty for 6 months old TV?
                      He says he can, and the backlight is just not working...

                      Have you tried freeze spray (or a hair drier) on the inverter and power supply?

                        Comment

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