Not sure of the resistor value of this

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  • korotoyo
    Member
    • Jan 2017
    • 25
    • Philippines

    #1

    Not sure of the resistor value of this

    Im trying to fix a 14 inch CRT tv with few flickering white horizontal lines at the bottom of the screen. These flickering lines gradually disappear when using the tv for maybe 5 minutes or more. They only appear when I turn on the tv after being unused for maybe 30 minutes or more.

    I read somewhere that it's related to the vertical ic section especially the capacitor. Upon checking I suspected a capacitor and a resistor. I started with the capacitor by desoldering one leg and lifted it. I wasn't really sure but I tried turning on the tv after a 30 minutes rest and was surprised to see no white lines. I tried it again by leaving the tv off for more than an hour. I turn on the tv and still no white lines. Yehey!

    One thing that bothers me though is about the resistor I tested with a multimeter which reads about 9 ohm and has a 5 color band as brown,black,black,brown,gold. I'm not really sure if it's actually a 10 ohm or 1k ohm resistor. Do I need to desolder and remove the resistor from the board to actually check its actual value?

    I hope somebody can help me identify this resistor. Please see attached picture.
    Attached Files
    Last edited by korotoyo; 01-30-2017, 08:20 AM. Reason: Incomplete title
  • petehall347
    Badcaps Legend
    • Jan 2015
    • 4425
    • United Kingdom

    #2
    Re: Not sure of the resistor value of this

    code says 1k 5 percent ..what does schematic say ?

    Comment

    • korotoyo
      Member
      • Jan 2017
      • 25
      • Philippines

      #3
      Re: Not sure of the resistor value of this

      Originally posted by petehall347
      code says 1k 5 percent ..what does schematic say ?
      That's the problem I can't find any schematics for this tv. It's a Changhong 14A01PH crt tv.

      It looks like it's a 5 band resistor in which online resistor checker tells me it's 1k 5%. But can also be a four band resistor, 10 ohm?

      Comment

      • korotoyo
        Member
        • Jan 2017
        • 25
        • Philippines

        #4
        Re: Not sure of the resistor value of this

        Sorry for the title of this post I forgot to add the tv model.

        Comment

        • dskall
          Badcaps Legend
          • Oct 2016
          • 2905
          • usa

          #5
          Re: Not sure of the resistor value of this

          Only need to lift one end to check it
          I assume no responsibility for any stupid suggestions I might post.

          Comment

          • R_J
            Badcaps Legend
            • Jun 2012
            • 9534
            • Canada

            #6
            Re: Not sure of the resistor value of this

            the usuall cause of lines at the bottom of the screen is a cap. in the vertical circuit output, If the lines were at the top it would be screen bypass cap. c486

            This could be the schematic? if not it could be close could be c304 or 307 which are in the output
            Attached Files
            Last edited by R_J; 01-30-2017, 11:20 AM.

            Comment

            • Andrew F. Ali
              Badcaps Legend
              • Jan 2014
              • 2450
              • Trinidad & Tobago

              #7
              Re: Not sure of the resistor value of this

              1Kohms 5%...Trust me..

              Comment

              • Agent24
                I see dead caps
                • Oct 2007
                • 4940
                • New Zealand

                #8
                Re: Changhong 14A01PH - Not sure of the resistor value of this

                Originally posted by korotoyo
                Do I need to desolder and remove the resistor from the board to actually check its actual value?
                Yes. Unless you know for certain there is nothing in parallel with it. But it is usually faster just to desolder one leg and test.
                "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                -David VanHorn

                Comment

                • keeney123
                  Lauren
                  • Sep 2014
                  • 2536
                  • United States

                  #9
                  Re: Not sure of the resistor value of this

                  So it looks to be 1K ohm 5 % tolerance with 100 parts per million per C temperature coefficient . That means for each degree C increase from ambient the resistance will not change more than 0.000100 ohms

                  Comment

                  • Andrew F. Ali
                    Badcaps Legend
                    • Jan 2014
                    • 2450
                    • Trinidad & Tobago

                    #10
                    Re: Not sure of the resistor value of this

                    Originally posted by Andrew F. Ali
                    1Kohms 5%...Trust me..
                    I think I made an awful error here.......Brown Black Black Brown GOLD Brown....is actually read just like a 5 band resistor....however we see here 6 bands which suggests 1 0 0 1 X 0.1 +/-1% which should be a 100.1ohm resistor +/- 1% tolerance.....This is a very hi-precision resistor.
                    What circuit is this from/used?

                    Comment

                    • korotoyo
                      Member
                      • Jan 2017
                      • 25
                      • Philippines

                      #11
                      Re: Not sure of the resistor value of this

                      Originally posted by R_J
                      the usuall cause of lines at the bottom of the screen is a cap. in the vertical circuit output, If the lines were at the top it would be screen bypass cap. c486

                      This could be the schematic? if not it could be close could be c304 or 307 which are in the output
                      Thank you for this! It looks like it. According to the schematic the R313 resistor I suspected is 1k ohm. The capacitor I removed at C310 which is causing the white lines at the bottom of the screen has a two line label. First line reads "0.033J" & second line reads "100". Schematic says it's "100V0.22u".

                      TV is working perfectly fine now even without the C310 capacitor. Should I replace it or just leave it that way?

                      How do you check the chassis no. anyway? I can't seem to find it anywhere on this tv.


                      Originally posted by dskall
                      Only need to lift one end to check it
                      I desoldered and lifted one leg of the R313 and tested it with my DMM. It reads 0.998k ohm. So it looks fine.


                      Thank you guys!
                      Attached Files

                      Comment

                      • korotoyo
                        Member
                        • Jan 2017
                        • 25
                        • Philippines

                        #12
                        Re: Not sure of the resistor value of this

                        Originally posted by Andrew F. Ali
                        I think I made an awful error here.......Brown Black Black Brown GOLD Brown....is actually read just like a 5 band resistor....however we see here 6 bands which suggests 1 0 0 1 X 0.1 +/-1% which should be a 100.1ohm resistor +/- 1% tolerance.....This is a very hi-precision resistor.
                        What circuit is this from/used?
                        It's from the vertical output section of a CRT TV Changhong 14A01PH.

                        Comment

                        • korotoyo
                          Member
                          • Jan 2017
                          • 25
                          • Philippines

                          #13
                          Re: Not sure of the resistor value of this

                          One more thing, as you can see from the 1st picture, tv screen is a little tilted. I tried the service mode menu but I'm not sure which of those settings to adjust if it's even possible. I read somewhere that you can set it by rotating the yoke. I'm not so sure how to do it though. Is this easy to do?

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Not sure of the resistor value of this

                            I still suspect bad lytics caps around that Vertical IC.
                            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

                            • gabiz_ro
                              Senior Member
                              • Mar 2011
                              • 167
                              • Romania

                              #15
                              Re: Not sure of the resistor value of this

                              Deflection coils block is problem of tilted image.
                              Need to be realigned.

                              Comment

                              • petehall347
                                Badcaps Legend
                                • Jan 2015
                                • 4425
                                • United Kingdom

                                #16
                                Re: Not sure of the resistor value of this

                                see those brown discs on the back of the tubes by the yoke with levers ?
                                looks like they have been moved . the yellow marks are not inline .
                                saying that they have been moved to align it . try each one a little amount and see what happens to the picture . best to have a large mirror in front of screen to do this .
                                if i remember correctly the discs move picture in a parabolic fashion .
                                also see if whole yoke has been moved at all .

                                Comment

                                • Agent24
                                  I see dead caps
                                  • Oct 2007
                                  • 4940
                                  • New Zealand

                                  #17
                                  Re: Not sure of the resistor value of this

                                  Originally posted by korotoyo
                                  First line reads "0.033J" & second line reads "100". Schematic says it's "100V0.22u".
                                  TV is working perfectly fine now even without the C310 capacitor. Should I replace it or just leave it that way?
                                  Yes, replace it. It will have a reason to be there. They don't just put parts in that do nothing. If they can save money by taking them out, they will.
                                  Sometimes the schematic is wrong. Or for a slightly different model or design revision. I would use the same value capacitor as was in the TV.
                                  "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                  -David VanHorn

                                  Comment

                                  • korotoyo
                                    Member
                                    • Jan 2017
                                    • 25
                                    • Philippines

                                    #18
                                    Re: Not sure of the resistor value of this

                                    Originally posted by Agent24
                                    Yes, replace it. It will have a reason to be there. They don't just put parts in that do nothing. If they can save money by taking them out, they will.
                                    Sometimes the schematic is wrong. Or for a slightly different model or design revision. I would use the same value capacitor as was in the TV.
                                    Ok but I'm not sure what to buy. What are those printed on the little blue capacitor that I removed mean? "0.033j 100". The ones I know are caps with something like "10v 220uf".

                                    Comment

                                    • korotoyo
                                      Member
                                      • Jan 2017
                                      • 25
                                      • Philippines

                                      #19
                                      Re: Not sure of the resistor value of this

                                      Originally posted by gabiz_ro
                                      Deflection coils block is problem of tilted image.
                                      Need to be realigned.
                                      How can I do this? When you say "deflection coils block", do you mean the yoke?

                                      I loosen the screw on the clamp and I tried to rotate the yoke but it won't move. Probably because of the white adhesive between the yoke and the black padding on the tube. I'm not sure how to proceed.

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #20
                                        Re: Not sure of the resistor value of this

                                        Originally posted by korotoyo
                                        Ok but I'm not sure what to buy. What are those printed on the little blue capacitor that I removed mean? "0.033j 100". The ones I know are caps with something like "10v 220uf".
                                        0.033uF 5% Tolerance, 100V, Polyester film (more likely).
                                        Does it show as bad? Leakage resistance?
                                        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

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