Lines in toshiba crt tv

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  • ENERGYSAVINGS
    Lemurjumping
    • Jun 2014
    • 56
    • USA

    #1

    Lines in toshiba crt tv

    MODEL 20AF41
    MFG DATE 2001 CRT TV

    I need opinions, info here.
    What to suspect, old CRT or worn caps? Ive heard electrolytics in the vertical circuit could do this.
    Thoughts all?
  • ENERGYSAVINGS
    Lemurjumping
    • Jun 2014
    • 56
    • USA

    #2
    Re: Lines in toshiba crt tv

    By the way, I have no schematic for this TV.
    But I am equipped with a full line-up of test equipment, except a capacitor tester, as I have never seen one that can reliably test caps in or out of circuit, even expensive ones.
    I test for ripple under load with an O-scope, provided the unit functions as this one does.
    Thanks in advance!
    -Lemur

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Lines in toshiba crt tv

      Service manuals:
      http://elektrotanya.com/?q=showresul...oria=&kat2=all

      So only seeing just one vertical line?
      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

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30919
        • Albion

        #4
        Re: Lines in toshiba crt tv

        foto's of the problem please.
        and it's not the crt - they last and last.
        unilike modern crap, a crt that does not use a narrow neck can last 30years+
        Last edited by stj; 06-09-2014, 01:38 PM.

        Comment

        • ENERGYSAVINGS
          Lemurjumping
          • Jun 2014
          • 56
          • USA

          #5
          Re: Lines in toshiba crt tv

          I took a photo and forgot to attach it. Here it is.
          Attached Files

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Lines in toshiba crt tv

            To me, looks like it is not blanking the signal properly on the vertical retrace. I know bad capacitors are common with many older Toshiba CRTs due to the use of Capxon capacitors.
            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

            • ENERGYSAVINGS
              Lemurjumping
              • Jun 2014
              • 56
              • USA

              #7
              Re: Lines in toshiba crt tv

              The picture looks bad because the shutter speed was too fast, the actual picture on the TV is good except for the lines at the top of the screen, at its worst, there is actually some "wrap around", or "foldover" your choice, at the top.

              Comment

              • stj
                Great Sage 齊天大聖
                • Dec 2009
                • 30919
                • Albion

                #8
                Re: Lines in toshiba crt tv

                probably small caps in the vertical timing area.

                does the picture look shifted down if you use teletext?
                because it could be your seeing the "hidden" lines used for teletext/closed-caption data.

                Comment

                • Th3_uN1Qu3
                  Believe in
                  • Jul 2010
                  • 6031
                  • Romania

                  #9
                  Re: Lines in toshiba crt tv

                  Replace C436, C407, C406. As seen on the schematic, page titled "Deflection schematic diagram". Should work fine then. Of course, also check for other bulged caps while you're in there. Those mentioned are too small to bulge, they would have simply dried out.
                  Originally posted by PeteS in CA
                  Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                  A working TV? How boring!

                  Comment

                  • stj
                    Great Sage 齊天大聖
                    • Dec 2009
                    • 30919
                    • Albion

                    #10
                    Re: Lines in toshiba crt tv

                    and check for broken solder joints on all transformers and parts bolted to heatsinks.
                    broken soldering was common on crt tv's

                    Comment

                    • ENERGYSAVINGS
                      Lemurjumping
                      • Jun 2014
                      • 56
                      • USA

                      #11
                      Re: Lines in toshiba crt tv

                      By small caps, do you mean not electrolytics?
                      I don't have the time to reverse engineer the TV, so it looks like I'm going to be shotgunning alot of caps. I haven't had to deal with this problem before, and could use a little direction of what area to shotgun, if some else has the experience/ knowledge.
                      By the way, I tried the text mode, it seems to make no difference.


                      But Hey!
                      THANK YOU guys for the schematic link and the other help, I am grateful.
                      By the way, I tried the text mode, it seems to make no difference.

                      Comment

                      • ENERGYSAVINGS
                        Lemurjumping
                        • Jun 2014
                        • 56
                        • USA

                        #12
                        Re: Lines in toshiba crt tv

                        Th3_uN1Qu3,
                        Didn't see your response before my last post, seems you answered my question.
                        Thank you.

                        Comment

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