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Dell E228WFPC goes dim after 10 minutes, not 2 seconds

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    Dell E228WFPC goes dim after 10 minutes, not 2 seconds

    Working on a Dell 22" monitor I purchased from eBay. The monitor stays on for approximately 10 minutes, then goes dim. When it does go dim, cycling the power causes 2 seconds to black behavior. Leave the monitor powered off for a few hours repeats the ability to have it run for 10 minutes, then the issue reappears.

    I've checked all the caps on the inverter board (Elite brand) with my blue ESR meter and all of them spec out fine.

    I metered the blue caps near the transformers and got similar ohms between the two (secondaries, right?)

    I DO have a few spares at work to check for possible CCFL failure, but I really don't want to pull apart another 22" panel that's in constant use unless I absolutely have to. These things are heavy and awkward.

    My symptoms are similar to the ones described in this thread:

    https://www.badcaps.net/forum/showth...light=e228wfpc

    And, of course, pics:
    Attached Files

    #2
    Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

    Just read your problem and the other thread. That's a strange problem.

    Its a shame you don't have some spare ccfls to eliminate that. I can't help but think that heat is causing the issue. You could try to leave the monitor off for sometime then slowly heat up an area of the board to see if that bring the symptoms on earlier. This could help determined where the issue might be for you.
    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

    How to resize your pictures guide click HERE
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      #3
      Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

      Sounds like a heat problem/ bad solder joint. Since you have 10 minutes before the problem occurs, may I suggest you try a hair dryer and heat up various portions of the power and logic boards to see if you can accelerate the problem. Hopefully, you'll be able to narrow down the board/area that's giving you the problem.

      Comment


        #4
        Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

        have you also checked the esr on the caps between the 2 heatsinks top right of picture?

        Comment


          #5
          Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

          Originally posted by vinceroger69 View Post
          have you also checked the esr on the caps between the 2 heatsinks top right of picture?
          Yes.

          Before I try any hair dryer tactics, it would probably be a better idea to place my panel on the boards of a known working donor monitor. If the problem migrates, then I know it's a CCFL issue.

          Comment


            #6
            Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

            You don't have to heat anything up to the extent that u might damage anything just enough yo replicate the fault which normally takes a few minutes.
            Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

            How to resize your pictures guide click HERE
            Retiredcaps Ideal post example click HERE

            Comment


              #7
              Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

              Hi if your boards are the same there is a longish thread here:
              http://en.community.dell.com/support...px?PageIndex=1

              Initially they thought it was a heat problem on the pwm though replacment did not seem to fix. They then added an extra resistor which appeared to work for some but for others was only partial fix as part of screen remained dim. I dont think they bottomed out why the resistor helped but of you were to extract all the relevant bits and could find a schematic for your your board i am sure budm would figure it out. If you could find a voltage regulator that should keep the voltage down to around 2v that is not working then that might be the answer

              Does it stay on longer if you turn the brightness down?
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment


                #8
                Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                Originally posted by selldoor View Post
                Does it stay on longer if you turn the brightness down?
                Hm....I'll have to try that.

                Comment


                  #9
                  Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                  Originally posted by smalltownguy View Post
                  Hm....I'll have to try that.
                  Or try the converse. Pump the brightness and contrast to max.
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                    #10
                    Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                    "Before I try any hair dryer tactics, it would probably be a better idea to place my panel on the boards of a known working donor monitor. If the problem migrates, then I know it's a CCFL issue."

                    Sounds good plan to me likewise if you have the panel off a donor try it on
                    these boards
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment


                      #11
                      Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                      Originally posted by smalltownguy View Post
                      I DO have a few spares at work to check for possible CCFL failure, but I really don't want to pull apart another 22" panel that's in constant use unless I absolutely have to. These things are heavy and awkward.
                      See budm's thread on "Inverter tester using old CFL"

                      https://www.badcaps.net/forum/showthread.php?t=19987
                      --- 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.

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

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                        #12
                        Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                        Update: I brought a sister monitor home today and swapped in the boards from the known good monitor with my panel. I gave it to my wife to work on all day with her design work.

                        Result: no problems all day.

                        OK, that's good, at least that means I've narrowed the issue down to the inverter or logic board(s).

                        So what now? Start stressing my suspect boards with brightness adjustments, or a hair dryer?

                        Comment


                          #13
                          Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                          A photo of your inverter board would be helpful.

                          Comment


                            #14
                            Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                            Originally posted by jetadm123 View Post
                            A photo of your inverter board would be helpful.
                            Eh?

                            Comment


                              #15
                              Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                              Oops! Been looking at too many Dell boards today. Some of them had separate inverter boards.

                              Comment


                                #16
                                Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                                "I metered the blue caps near the transformers and got similar ohms between the two (secondaries, right?)"
                                So are you able to read the resistance of these two blue ballast caps?
                                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


                                  #17
                                  Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                                  Originally posted by budm View Post
                                  "I metered the blue caps near the transformers and got similar ohms between the two (secondaries, right?)"
                                  So are you able to read the resistance of these two blue ballast caps?
                                  How do you do that?

                                  I did test all the caps on both boards with my ESR meter.

                                  Comment


                                    #18
                                    Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                                    I am just trying to find out if the two ballast caps have leakage resistance when you check them with the Ohm meter.
                                    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


                                      #19
                                      Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                                      Try to replace C806.

                                      I had the same symptom with the same IPboard.
                                      I used hot-air to locate heat affected component then found C806 conduct when it heat, replaced with 0.1uF/50V 0805 running fine for 2 months.
                                      | AMD Phenom II X2 550BE | GIGABYTE GA-MA790FXT-UD5P | GeIL DDR3 Ultra 2x2GB 1600C7 |
                                      | XFX GTS250 DDR3 512MB | Dell H525EF-00 | Lancool PC-K62 Black | Samsung 2232GW |
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                                      Comment


                                        #20
                                        Re: Dell E228WFPC goes dim after 10 minutes, not 2 seconds

                                        Cant see C806 is that a ceramic smd on the back?
                                        What voltages do you get on the two black caps in the inverter side of the PS (one is possibly c805)
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

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