Dell - ST2410 - Flickering screen light and dark

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  • SkeeterUK
    New Member
    • Jul 2014
    • 9
    • uk

    #1

    Dell - ST2410 - Flickering screen light and dark

    Posted my problem in the New Members thread so ill just copy it to here.

    Hi im SkeeterUK. From the UK. I have registered with the site in hopes of some assistance with monitor repair.

    I have a dell st2410 monitor. It was flickering on the brightness. I suspected the cfl bulbs but was then told it could be bad caps inside. With it being unusable my monitor i thought why not and open it up to see if there was any.

    http://s1374.photobucket.com/user/Sk...slideshow/caps

    As you can see there wasnt but no buldging doesnt auto mean not a bad cap. I dont have a multimeter i dont know squat about electrics tho im good at pcs and building em. Anyhow, if it was bad caps i was gona get my cuson to solder new ones in if i could find out what caps was needed. Anyhow as pics, i duno if its caps afterall.

    Problem was, pink hue in the bottom left corner of the screen when viewing a all white screen like notepad open. When starting monitor it was all pink near the bottom not as bad on the top half but went away after 15 secs. This is from a cold boot. Later as of today. It was flickering light and dark. It wasnt too bad, then it stayed on longer and flickered more. Then once today it went black as if turned off (duno if it did turn in to standby or not cant recall color on power button) then came on about half a min later or somit.

    Anyhow, i cant post a new topic it seems, so any help would be appreciated.
    I had tried the 2 self tests dell told me without any cable in for the computer, still flickered, also tried vga and dvi cable both connecting to either onboard or dedicated gpu, still flickered. Was so bad i thought why not look at caps on it as someone at a different forum suggested it might be.
    Last edited by SkeeterUK; 07-30-2014, 03:28 AM.
  • selldoor
    Slow Learner
    • Dec 2010
    • 7870

    #2
    Re: Dell - ST2410 - Flickering screen light and dark

    Can you post good clear pictures of the power supply and main board
    Looking straight on , top and bottom. Post them using manage attachments
    jpg less then 3mb work ok.
    Pink tint suggests a faulty bulb as does flickering. Has it got many hours on it?
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

    • SkeeterUK
      New Member
      • Jul 2014
      • 9
      • uk

      #3
      Re: Dell - ST2410 - Flickering screen light and dark

      Darn, ive put it back together now as i thought the pics in the link would have been enough.

      Comment

      • selldoor
        Slow Learner
        • Dec 2010
        • 7870

        #4
        Re: Dell - ST2410 - Flickering screen light and dark

        Well, if it is bulbs you will need it in even more bits.
        Please upload pictures using attachment function when ask for help on the repair
        http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • SkeeterUK
          New Member
          • Jul 2014
          • 9
          • uk

          #5
          Re: Dell - ST2410 - Flickering screen light and dark

          I did try to access the bulbs but the thin frame bits around the actual lcd display was nerve racking so i stopped when i got up to a point where i thought hmm can i put this back together after i do this next bit...

          Little bit too far out of my comfort zone. The caps i might have managed with help from cuson to do the soldering but changing the bulbs i dont know if i can do it.

          Comment

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: Dell - ST2410 - Flickering screen light and dark

            Ok - you may want to part it out then or sell as fault or try and buy one with
            a power supply fault.
            Something to try as you say the pink is predominantly at the bottom is
            to swap the leads to the bulbs over - That was one reason for the pics
            cant see them, anyway assume there are two one is usually for the top bulbs
            and one for the bottom so if you can swap them the pink should go to the top.
            If not then we can look elsewhere.

            Interesting to see two dells with a similar problem on here at the same time.
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • SkeeterUK
              New Member
              • Jul 2014
              • 9
              • uk

              #7
              Re: Dell - ST2410 - Flickering screen light and dark

              Hmm link works for me, ah well here you are. Pics.
              Attached Files
              Last edited by SkeeterUK; 07-30-2014, 07:05 AM.

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #8
                Re: Dell - ST2410 - Flickering screen light and dark

                page doesnt exist that is the reason we ask for them to be posted using manage attachments
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • SkeeterUK
                  New Member
                  • Jul 2014
                  • 9
                  • uk

                  #9
                  Re: Dell - ST2410 - Flickering screen light and dark

                  Pics updated in previous post.

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #10
                    Re: Dell - ST2410 - Flickering screen light and dark

                    Ok - talking at cross purpose, but thanks for those pictures - I was trying to say I cant see any
                    connectors for the lamps in the pictures not that I couldnt see the pictures.

                    Anyway assume there are two one is usually for the top bulbs
                    and one for the bottom so if you can swap them the pink tinge should go to the top
                    confirming a bulb problem.
                    If not then we can look elsewhere.
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • chozo4
                      Nothing Special
                      • Jan 2013
                      • 134
                      • USA

                      #11
                      Re: Dell - ST2410 - Flickering screen light and dark

                      hmm, it could be a bad solder joint too. Inspect every solder joint closely on the through-hole components for a small hairline break around where the joints are soldered if there are any at all. Symptoms such as this can show poor functionality until the heat cycles causing on/off or variations thereof.

                      Just fixed a TV for a friend that wouldn't power on the screen at all and would exhibit power supply clicking. Was a bad solder joint at one of the transistors collector and fired right up upon fixing it.

                      This has some good examples on how to spot such a joint.
                      How to spot a dry joint, (fixing relay units or ecu)
                      http://mercedes-190.co.uk/topic/6581171/1/

                      and a video demonstrating it:
                      https://www.youtube.com/watch?v=9VYA9ufb4Jc
                      Last edited by chozo4; 07-31-2014, 12:16 AM.
                      Even crap caps can be useful... such as blank rounds for prop gunfights.

                      Comment

                      • SkeeterUK
                        New Member
                        • Jul 2014
                        • 9
                        • uk

                        #12
                        Re: Dell - ST2410 - Flickering screen light and dark

                        I tapped the top corner of the screen when testing the self test colors when dissasembled and the flicker went away. So i put it back together, it lasted about 3-4 hours and then the screen went off and wont stay on. When the screen is turned on it flashes up like its ok then immediatly goes black but i can see a faint image of it working as when i press the start button i can just about make out the menu pop up that comes with clicking on start button.

                        Swear tho that when i looked at the caps they were fine lookin and not buldging. What could it be, caps bad but looks fine? a transistor of sorts? inverter whatever that is?

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Dell - ST2410 - Flickering screen light and dark

                          These st series is cost cutting design using just 2 lamps instead of 4 lamps so the lamps are driven hard and they just fail. They are just bad series, only 2 lamps for 22" and 24".
                          This the 22" version:
                          http://s807.photobucket.com/user/bud...?sort=3&page=1

                          https://www.badcaps.net/forum/showthread.php?t=39282
                          Last edited by budm; 08-04-2014, 11:01 PM.
                          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

                          • Lumberjack777
                            Badcaps Veteran
                            • Dec 2010
                            • 464

                            #14
                            Re: Dell - ST2410 - Flickering screen light and dark

                            Originally posted by selldoor
                            Something to try as you say the pink is predominantly at the bottom is
                            to swap the leads to the bulbs over - That was one reason for the pics
                            cant see them, anyway assume there are two one is usually for the top bulbs
                            and one for the bottom so if you can swap them the pink should go to the top.
                            That was a very good point selldoor made. A pinkish hue on a white screen is almost always a CCFL (bulb) that is going bad. By swapping top and bottom connections the pink hue would move to the top and you'd know for sure.

                            I don't think this is a cap problem. I think its a bulb problem. You'll need to get a set of test bulbs, or make some.

                            EDIT: I see you still type faster budm. Glad to see we came to the same conclusion
                            Last edited by Lumberjack777; 08-04-2014, 11:15 PM.

                            Comment

                            • SkeeterUK
                              New Member
                              • Jul 2014
                              • 9
                              • uk

                              #15
                              Re: Dell - ST2410 - Flickering screen light and dark

                              I tried awhile ago see if they could be switched the cables for the bulbs, but while one would go in the other one the other one couldnt reach the other port so no it wouldnt work as one cable was too small.

                              Comment

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #16
                                Re: Dell - ST2410 - Flickering screen light and dark

                                Well its probably too late now if the bulb was bad tapping it will have finished it off possibly
                                taking the inverter with it. Best option now would be to make up two of Budms test lamps
                                from household cfls and try with those. Instructions are in Budms signature on th ebottom of most of his first posts in any thread.
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                • SkeeterUK
                                  New Member
                                  • Jul 2014
                                  • 9
                                  • uk

                                  #17
                                  Re: Dell - ST2410 - Flickering screen light and dark

                                  Thanks for your replies but i think its too far gone for me to mess with now, saw a ยฃ20 acer 22" x223HQ so got that today, it works, will do till i can afford a decent one once again.

                                  Again cheers for replying.

                                  Comment

                                  • selldoor
                                    Slow Learner
                                    • Dec 2010
                                    • 7870

                                    #18
                                    Re: Dell - ST2410 - Flickering screen light and dark

                                    Perhaps you can sell it for spares/repairs whatever dont throw it away -offer it on
                                    freecycle or freegle - id have had a go at it if it was in my area.
                                    Some Acers are also prone to bad bulbs - in search above type in the model and see if anything comes up.
                                    Please upload pictures using attachment function when ask for help on the repair
                                    http://www.badcaps.net/forum/showthread.php?t=39740

                                    Comment

                                    • techgirl107
                                      New Member
                                      • Sep 2014
                                      • 1
                                      • USA

                                      #19
                                      Re: Dell - ST2410 - Flickering screen light and dark

                                      I'm looking to fix a Dell st2410b for a friend and in need of an IC. It's located in the top left hand corner of the main board. It has four capacitors around it. I have tested this part and it is bad. The only thing is, I can't locate this part from the numbers on it anywhere on the net. It looks like some kind of IC regulator. If someone knows exactly what part this is, it would be greatly appreciated if you would let me know.

                                      Thanks

                                      Comment

                                      • Lumberjack777
                                        Badcaps Veteran
                                        • Dec 2010
                                        • 464

                                        #20
                                        Re: Dell - ST2410 - Flickering screen light and dark

                                        If you could attach a nice closeup picture that would help a lot. I'm a little curious how you could test it unless you know what the part is. If it's a voltage regulator you'll need to know if its fixed or adjustable. Also, the capacitors nearby can go bad and never show any outward signs. If you could get us a nice closeup we might be able to identify the IC, and/or isolate the problem.

                                        Comment

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