Samsung UE49MU7470U LED backlight issue causing shadow?

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Donny2derby
    Badcaps Veteran
    • Apr 2023
    • 228
    • Uk

    #1

    Samsung UE49MU7470U LED backlight issue causing shadow?

    Hi all. So from the knowledge I've picked up so far I believe the issue maybe caused by a failed strip of LED's? Looking at the photos would that be plausible?

    Secondly. How in gods name do you get access to the backlight panel? Mother of god

    I've tested the voltages with the tv powered up on the terminal rail marked CNL 802 and they're as follows reading from pin marked (A) upwards. Pin to ground.

    Pin A 298v DC
    298v DC
    0v DC
    216v DC
    216v DC
    0v Dc
    Attached Files
    Last edited by Donny2derby; 04-29-2023, 10:00 AM.
  • Diah
    Badcaps Legend
    • Feb 2013
    • 6355
    • Germany

    #2
    Re: Samsung UE49MU7470U LED backlight issue causing shadow?

    yes its LED back light issue at the left side... few LED burned, but not only this..because the LED are edge strips .. mean the first reflection plate surface burned too because dummy Korean put it so close to touch LED surface

    you need to take out the panel.. and all filter sheet under it to have access to this LEDs... look on youtube there are so many video

    Comment

    • Donny2derby
      Badcaps Veteran
      • Apr 2023
      • 228
      • Uk

      #3
      Re: Samsung UE49MU7470U LED backlight issue causing shadow?

      I’m so glad someone like you has responded to confirm my findings Diah!

      In your opinion is it a relatively easy and not too complicated job to fix this? Is it worth it economically as well? What will be the cost of replacing the LED’s? Are they available to buy readily and cheaply? Will I have to buy a new reflective plate as well?

      Do you know the part number of the LED’s I need to buy? I’d rather buy them and have them ready to change before taking the screens apart so I can go about swapping them straight away and then put it all back together in one go.

      Thanks.
      Last edited by Donny2derby; 04-29-2023, 10:35 AM.

      Comment

      • nomoresonys
        Badcaps Legend
        • Jan 2013
        • 12097
        • U.S.

        #4
        Re: Samsung UE49MU7470U LED backlight issue causing shadow?

        Probably something like this, just don't try to go along as fast as this guy does, he's done it before: https://www.youtube.com/watch?v=xwxfWPuwImE
        https://www.youtube.com/watch?v=x_xEGjyaYxM
        Last edited by nomoresonys; 04-29-2023, 10:38 AM.

        Comment

        • Donny2derby
          Badcaps Veteran
          • Apr 2023
          • 228
          • Uk

          #5
          Re: Samsung UE49MU7470U LED backlight issue causing shadow?

          Originally posted by nomoresonys
          Probably something like this, just don't try to go along as fast as this guy does, he's done it before: https://www.youtube.com/watch?v=xwxfWPuwImE
          https://www.youtube.com/watch?v=x_xEGjyaYxM
          Wow. That's a serious amount of work. Particularly when I'm not accustomed to something like this. I don't own suction pads so that's going to set me back £25 or more!

          I appreciate we all have to have a learning curve but this seems like a lot of effort for something I'm not guaranteed to see a return on!

          How much would these LED's and screens cost to replace and what could I realistically expect to sell the telly for once repaired?

          Thanks.

          I think I'll change my username to nomoresamsungs!

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12097
            • U.S.

            #6
            Re: Samsung UE49MU7470U LED backlight issue causing shadow?

            "I think I’ll change my username to nomoresamsungs!" If I could have 2 names, I would get that one, lately samsung does win for the shittiest name brand tv.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12097
              • U.S.

              #7
              Re: Samsung UE49MU7470U LED backlight issue causing shadow?

              Check some of the techniques on youtube for screen removal, some do not use suction cups because they can suddenly just let go and the screen can break and other various reasons, it's the biggest job in tv repair but it's not really that bad, notice how quickly the guy gets thru it on the videos, of course he's done it many times, the strips aren't too bad to buy, need to get them from someone with good feedback, probably lots on ebay. Not sure what tvs are going for in your neck of the woods, here's a sample on ebay U.K.: https://www.ebay.co.uk/sch/i.html?_f...Condition=3000

              Comment

              • Diah
                Badcaps Legend
                • Feb 2013
                • 6355
                • Germany

                #8
                Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                Originally posted by Donny2derby
                I’m so glad someone like you has responded to confirm my findings Diah!

                In your opinion is it a relatively easy and not too complicated job to fix this?

                Thanks.
                its not easy task to one who never did it before,,, also it will coast on you and you will never find the reflector plate any where.. sell it on ebay since it displaying picture.. at least you will earn money instate if the screen break down under yours hand,, never buy Samsung U again

                Comment

                • Donny2derby
                  Badcaps Veteran
                  • Apr 2023
                  • 228
                  • Uk

                  #9
                  Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                  Originally posted by nomoresonys
                  Check some of the techniques on youtube for screen removal, some do not use suction cups because they can suddenly just let go and the screen can break and other various reasons, it's the biggest job in tv repair but it's not really that bad, notice how quickly the guy gets thru it on the videos, of course he's done it many times, the strips aren't too bad to buy, need to get them from someone with good feedback, probably lots on ebay. Not sure what tvs are going for in your neck of the woods, here's a sample on ebay U.K.: https://www.ebay.co.uk/sch/i.html?_f...Condition=3000
                  Thanks Sonys. Your help is massively appreciated. I appreciate everyone who tries to help me but you have been particularly helpful to me each time I've posted so huge thanks to you mate!

                  I've looked into the cost of the make and model and think I can make something back on this even if it's gonna cost me a few quid to buy some gear to help me remove the screen and and also replace the LED's.

                  Will the part numbers for the LED's be on them or somewhere on the panel or are they a generic size for that size of telly?

                  Thanks.

                  Comment

                  • lotas
                    Badcaps Legend
                    • Jan 2016
                    • 4540
                    • Russia

                    #10
                    Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                    Maybe all the same your model is not ue49Mu7470u, but ue49Mu6470u, then your backlight with the number is BN96-39674A.
                    Last edited by lotas; 04-29-2023, 01:51 PM.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12097
                      • U.S.

                      #11
                      Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                      Part numbers should be on the strips, what I would probably do since a lot of these samsungs, specially the NU models can have burnt diffuser sheets is carefully take it down to the backlights and check those diffusers to make sure they are ok and not burnt, I think where the most problems with panels getting broken is you have to make sure, when you put the panel back on that it sits even, smooth and exactly how it was before, slow and light handed, might have to get the backlights from aliexpress I guess if they're too high on ebay etc. Thanks, always like helping decent people like yourself.
                      Last edited by nomoresonys; 04-29-2023, 01:58 PM.

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12097
                        • U.S.

                        #12
                        Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                        Originally posted by lotas
                        Maybe all the same your model is not ue49Mu7470u, but ue49Mu6470u, then your backlight with the number is BN96-39674A.
                        Yes, I saw the 6470U but not exactly 7470U, not sure if there's a difference or not, the 6470U is there on ali: https://www.aliexpress.us/item/32568...andl_shipto=US

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12097
                          • U.S.

                          #13
                          Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                          More: https://www.aliexpress.com/w/wholesa...tail.1000002.0

                          Comment

                          • Donny2derby
                            Badcaps Veteran
                            • Apr 2023
                            • 228
                            • Uk

                            #14
                            Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                            Ok lads thanks for the help.

                            The tv is stored at work tonight. I’m going to pop to screwfix and buy some suction cups on Tuesday on my day off and then start work on the telly again Saturday night when I’m back at work.

                            Will let you know how I get on.

                            Thanks again.

                            Comment

                            • Donny2derby
                              Badcaps Veteran
                              • Apr 2023
                              • 228
                              • Uk

                              #15
                              Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                              Originally posted by nomoresonys
                              Do I need to buy just the one of those pal? You reckon that's deffo suitable?

                              I'd hate for us to fall out now because you've give me a bum steer on some parts I can't use! You have a reputation to keep!

                              Comment

                              • nomoresonys
                                Badcaps Legend
                                • Jan 2013
                                • 12097
                                • U.S.

                                #16
                                Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                                Lol, oh shit, did I forget the do this at your own risk clause. I'm proud of my amateur status, if I knew everything about fixing tvs I would be bored to death and quit, I like the puzzle factor of it all tho and trying to figure out what the fault might be.
                                Last edited by nomoresonys; 04-29-2023, 07:33 PM.

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12097
                                  • U.S.

                                  #17
                                  Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                                  Originally posted by Donny2derby
                                  Do I need to buy just the one of those pal? You reckon that's deffo suitable?

                                  I'd hate for us to fall out now because you've give me a bum steer on some parts I can't use! You have a reputation to keep!

                                  I'd prolly get both strips, who wants the buyer back on your doorstep in a month bitching about a black spot.

                                  Comment

                                  • Davi.p
                                    Hobbist Tech
                                    • Sep 2009
                                    • 4289
                                    • Italy - Milan

                                    #18
                                    Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                                    Noooo!! One hobbyist must learn a lot of tricks to keep the expense low, suction pump is not mandatory, first search YouTube there is a video on how to remove back cover in Samsung with metal rods and no screws, it's almost easy, delicate but easy. Then detach the panel distribution boards from other board so you can lift by one side very slowly to vertical position the glass matrix, better to do this on a bed because is low, you will get it and slowly place it in vertical on a cushion or soft cloth and touching a wall or vertical face. Another thing, you must open it right away because you must ensure if plastic sheet are damaged or not, it is not said..another important trick, the search will be wider and cheaper results if you get the strip codes printed on them..

                                    Comment

                                    • Donny2derby
                                      Badcaps Veteran
                                      • Apr 2023
                                      • 228
                                      • Uk

                                      #19
                                      Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                                      Sonys, you're a gentleman! There's not many of us left

                                      Comment

                                      • Donny2derby
                                        Badcaps Veteran
                                        • Apr 2023
                                        • 228
                                        • Uk

                                        #20
                                        Re: Samsung UE49MU7470U LED backlight issue causing shadow?

                                        Originally posted by Davi.p
                                        Noooo!! One hobbyist must learn a lot of tricks to keep the expense low, suction pump is not mandatory, first search YouTube there is a video on how to remove back cover in Samsung with metal rods and no screws, it's almost easy, delicate but easy. Then detach the panel distribution boards from other board so you can lift by one side very slowly to vertical position the glass matrix, better to do this on a bed because is low, you will get it and slowly place it in vertical on a cushion or soft cloth and touching a wall or vertical face. Another thing, you must open it right away because you must ensure if plastic sheet are damaged or not, it is not said..another important trick, the search will be wider and cheaper results if you get the strip codes printed on them..
                                        Thanks Davi. The set is stored at work so I don't have access to a bed sadly haha. Apart from that appreciate the advice. But I think I'm gonna buy the suction cups just to make things easier for me. I'm going to order the LED's later and will update the thread when they arrive off a slow boat from china and I can start the replacement.

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Document Archive
                                          Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
                                          by Document Archive
                                          This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                          09-07-2024, 05:50 AM
                                        • vincentedel
                                          Samsung SyncMaster 740n Phase Control Issue
                                          by vincentedel
                                          Hello,
                                          I'm having an issue with the Samsung 740n's phase control setting. When I use the automatic adjustment, it sets the value to around 54 (with a range of 0-100), and the picture looks clear and sharp. However, after some time—like after playing a game—the text starts to look blurry. When I auto-adjust again, it may increase the value to 80, and everything becomes sharp once more. Yet, after a while, whether it's a few hours or a day later, the same blurriness returns, and I have to adjust it again.

                                          I'm using the Samsung 740n monitor drivers instead of the default plug-and-play...
                                          04-22-2025, 12:33 AM
                                        • Manucsl
                                          QE65Q800TATXXC Samsung TV Issue
                                          by Manucsl
                                          Hello.

                                          My TV is a QE65Q800TATXXC Samsung TV.

                                          Issue : When you plug the 220V, voltages are OK on the power board and you can hear the click from the relay, but TV is not starting when power button is pressed. Red led is blinking when you press power button. But no images or sound ( Back-light is off )
                                          Then if you disconnect the cable from the main board to the power supply, the TV back-light turns on.
                                          Any ideas to check would be very appreciated 😊

                                          After reading some posts on this forum, I suspect an eeprom issue so I bought a CH341A to dump...
                                          02-19-2025, 07:47 AM
                                        • FourRunner
                                          Display issue Samsung TV UA65JS9000W
                                          by FourRunner
                                          I purchased a used Samsung TV model UA65JS9000W recently knowing it had an issue with the screen. When switched on the picture was bright both sides of the screen but a little darker in the middle of the screen. Thinking this was the back lights (side mounted LCD strips) I replaced these, however the issue is still there. I am now thinking it may be a TCOM issue, but am not sure, any advice on this would be appreciated. Also whilst changing out the back lights I noticed the the thick clear plastic sheet (maybe 1.5 to 2mm thick) below the diffusers there is cracking (up to 75mm) on the sides and...
                                          10-03-2024, 07:05 PM
                                        • ScHAmPi
                                          Samsung UE48JU7000 screen issue after backlight replacement
                                          by ScHAmPi
                                          Hi all,

                                          Because of two bright spots and a couple of dark spots I decided to replace the backlights in my Samsung UE48JU7000. See attached photos:


                                          I thought all went well, but after full assembly and testing it out it turns out not all is fine. The backlights are completely fine but I have some weird issues on the right half of the screen. Since I didn't really touch the T-CON board (apart from taking out the ribbons of the display and reconnecting them on assembly) it would be weird that the issue is with the T-CON board... But based on the behavior of the service...
                                          07-15-2024, 05:41 AM
                                        • Loading...
                                        • No more items.
                                        Working...