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Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

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    #1

    Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

    The TV was completely dead at first, and when I opened it up there were several blown caps. In the picture you will see 10 blue capacitors, those are the new ones. After replacing those the TV now turns on and functions normally however the picture appears faded/washed out. Turning the brightness up or down seems to do nothing at all.

    I actually just now, while writing this and uploading pictures, noticed that there is a single cap on the main board that is the same as those that I replaced on the power board. I have one of these, which I learned after buying it apparently isn't very useful for testing capacitors. Would I be able to get an accurate measurment in this case? I set it on 2000uF (the cap is 25v 1000uf) and hooked it up, it started reading at just under 400 and slowly increased until it evened out around 530.

    Also here are the readings off of the power board:
    BON = 4.66v
    PWM = 3.39v
    GND = -0.01v
    12V = 12.13v
    32V = 0.00v
    5VZ = 5.00v
    5VS = 5.00v
    PON = 4.52v
    Attached Files
    Last edited by PohTayToez; 02-02-2013, 04:31 PM.
    Tags: None
    #2
    Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

    Please list the brand and series of the capacitors used for replacement. Inadequate capacitors can cause a variety of symptoms.
    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

      #3
      Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

      Damn, didn't think about the new ones being bad.

      Here is a pic of one of the replacement capacitors.

      Comment

        #4
        Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

        Ugh, wouldn't touch them with a ten-foot pole. Never heard of them, so I do not trust them.
        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

          #5
          Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

          Originally posted by PohTayToez View Post
          Damn, didn't think about the new ones being bad.
          You live in the USA with access to reputable distributors like digikey, mouser, badcaps.net, etc. With digikey, USPS 1st class shipping will be around $3 for caps and you get it within 2-3 days.

          Why deal with capacitors on ebay when 95%+ are fake?

          Just get Panansonic low ESR FR, FM and FC series.
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          Comment

            #6
            Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

            I wonder why the 32V is not present?

            Comment

              #7
              Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

              That is analog tuner voltage, may not be present if it only has digital tuner.
              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

                #8
                Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                Hey so I'm a bit of a newbie, and a little lost on how to order from Digikey. I assume these are aluminum capacitors, right? Do I order off of the product index? I don't know what I need outside of capacitance and voltage. The options for ripple current, ESR, impedence, etc have me completely lost.

                Comment

                  #9
                  Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                  Originally posted by PohTayToez View Post
                  The options for ripple current, ESR, impedence, etc have me completely lost.
                  The following has why, how, examples, and suggested replacements (regulars may skip).

                  https://www.badcaps.net/forum/showpo...84&postcount=3
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                  We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                  Please do not post inline and offsite as they slow down the loading of pages.

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                  Comment

                    #10
                    Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                    I want to go ahead and replace all of the through-hole caps on this board however there is one that I absolutely cannot find the datasheet on. It a 10uf 25v capacitor manufactured by Changzhou (Chang), and the series is CD81. Would it be possible to assume safe values for a replacement capacitor?

                    Comment

                      #11
                      Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                      Originally posted by PohTayToez View Post
                      Would it be possible to assume safe values for a replacement capacitor?
                      If you cannot find a datasheet for it, just use Panasonic FC.

                      http://www.digikey.com/product-detai...1212-ND/356116
                      --- begin sig file ---

                      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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                      Comment

                        #12
                        Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                        Alright I've replaced all of the cheapo caps with good ones and replaced two more caps on the power board along with one on the input board. It still does the exact same thing (color is washed out; with no video input the screen is more of a gray than a black like it would be normally).

                        I'll be testing voltage regulators next.

                        Comment

                          #13
                          Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                          It sounds to me like it has Gamma problem due to bad power supply in the T-CON board.
                          Can we see the screen shot?
                          Does it look like this?
                          https://www.badcaps.net/forum/showth...mma#post304275
                          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

                            #14
                            Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                            Alright, I attached too pictures. The first one is the TV in question. The second picture is of a smaller but similar model TV that is in good working condition, taken with the same camera in order to compare the coloration of the two.
                            Attached Files

                            Comment

                              #15
                              Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

                              Voltage Regulators:
                              Main Board-

                              N602
                              1117SADJ
                              0820PJ
                              Pin 1 = 2.04v
                              Pin 2 = 3.30v
                              Pin 3 = 4.99v

                              N603
                              AZ1170
                              -3.3E1
                              927J59
                              Pin 1 = 0.00v
                              Pin 2 = 3.32v
                              Pin 3 = 4.87v

                              N604
                              1117SADJ
                              0820PJ
                              Pin 1 = 0.58v
                              Pin 2 = 1.83v
                              Pin 3 = 3.32v

                              N605
                              AZ1117D
                              -3.3E1
                              927J81
                              Pin 1 = 0.00v
                              Pin 2 = 3.32v
                              Pin 3 = 4.94v

                              N611
                              1122G
                              0923EG
                              Pin 1 = 0.00v
                              Pin 2 = 1.20v
                              Pin 3 = 3.32v

                              T-Con Board-
                              IC501
                              50117K-5
                              Pin 1 = 0.00v
                              Pin 2 = 3.31v
                              Pin 3 = 4.81v

                              I haven't looked at any datasheets yet but I'm thinking that N611 seems like it may be off?

                              Comment

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