Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • TVTinkerer
    Member
    • Jan 2018
    • 21
    • USA

    #1

    Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

    As the title says, I have a Samsung UN46C6400 which powers on, the LED backlight comes on, sound works, and all the touch buttons work - but there's no picture. When powered on with no input the LED lights are fairly dim, but then when you connect an active HDMI source the backlight gets much brighter and sound comes out of the speakers.

    My initial instinct was a bad T-con board, so I ordered a replacement from eBay - which says it was taken from a working TV with a broken LCD. But after I swapped it out the TV still exhibits the same symptoms. I've messaged the seller to confirm if the board was truly tested to be 100% working, meaning actually got a picture on a TV with that board installed in it, and I'm waiting for a reply.

    In the meantime, is it possible that it could be something else? If the main board or power supply board were bad then I don't think everything else would be working 100% like it does, would it? Or how about a bad connector cable from the main board to the t-con? Is there any chance of that? Or is the board I got from that seller probably defective also? Any way to test it? I don't see any visible issues with either one (bad capacitors, cracked solder joints, etc).

    Looking for some input before trying to buy another part to fix it, since I'm already into the TV $50 before any repairs and it's probably only worth $200-$250 in working condition.

    Thanks!!
    Last edited by TVTinkerer; 01-09-2018, 03:03 PM.
  • getmoresoon
    New Member
    • Sep 2016
    • 6
    • Canada

    #2
    Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

    Hi, is it no pic, or an extremely washed out one?

    Comment

    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa

      #3
      Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

      Need some pictures. Do you have power to t-con?
      I assume no responsibility for any stupid suggestions I might post.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

        Do you have 12VDC at both ends of the fuse with ref. to GND?
        There are also many Voltage Test points on the T-CON.
        http://www.shopjimmy.com/catalogsear...ung+UN46C6400+
        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

        • TVTinkerer
          Member
          • Jan 2018
          • 21
          • USA

          #5
          Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

          Originally posted by getmoresoon
          Hi, is it no pic, or an extremely washed out one?
          No pic at all, but the backlight is fully on. Screen isn't cracked or damaged in any way. And sound works, menu buttons work, everything. Just no picture.

          Comment

          • TVTinkerer
            Member
            • Jan 2018
            • 21
            • USA

            #6
            Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

            Originally posted by dskall
            Need some pictures. Do you have power to t-con?
            There isn't much to see in pics, just s blank screen with a backlight on. Or did you mean see pics of the boards to see if any capacitors look like they might be bad? I'd much rather repair a board than have to buy a whole new one, I've just never dealt with anything but radial electrolytic capacitors so I don't even know what to look for on the other types.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

              We need pictures of the boards and the DC Voltage reading with ref. to GND on both ends of the SDM fuse on the T-CON board.
              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

              • TVTinkerer
                Member
                • Jan 2018
                • 21
                • USA

                #8
                Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                I just heard back from the eBay seller I bough the t-con board from, and he told me he buys broken TV's and parts them out on eBay, and that particular board came from a TV where the screen was shattered so he can't say with 100% certainty if it actually worked or not. So he offered me a refund and no need to send it back. I'm guess it was probably bad also, in fact maybe since the TV stopped working the owner got mad and took a baseball bat to it - hence the broken screen! LOL

                So before I order another board, is there a was to test that the proper power/signal is getting to the t-con board? I looked on ShopJimmy.com and I see the boards for sale, but I didn't see anywhere that talked about how to test the signal coming from the main board.

                Comment

                • TVTinkerer
                  Member
                  • Jan 2018
                  • 21
                  • USA

                  #9
                  Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                  Also, one odd thing is the board that was in the TV when I got it is P/N 35-D046450. However, when I looked on ShopJimmy that board shows it's for the TV model UN46C6500VF and mine is UN46C6400RF. The boards listed for my TV are either BN81-05772A or LJ94-03436D. http://www.shopjimmy.com/catalogsear...UN46C6400RFXZA

                  Is it possible that this TV stopped working, someone tried swapping out the t-con board with another in an attempt to fix it, but mistakenly used the wrong board and then got rid of it when it still didn't work? So it may not even have the correct board in it? Is there any way to tell what board this TV should have in it by looking at the LCD panel model number?

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                    Originally posted by TVTinkerer
                    I just heard back from the eBay seller I bough the t-con board from, and he told me he buys broken TV's and parts them out on eBay, and that particular board came from a TV where the screen was shattered so he can't say with 100% certainty if it actually worked or not. So he offered me a refund and no need to send it back. I'm guess it was probably bad also, in fact maybe since the TV stopped working the owner got mad and took a baseball bat to it - hence the broken screen! LOL

                    So before I order another board, is there a was to test that the proper power/signal is getting to the t-con board? I looked on ShopJimmy.com and I see the boards for sale, but I didn't see anywhere that talked about how to test the signal coming from the main board.
                    Read post #7 again.
                    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

                    • TVTinkerer
                      Member
                      • Jan 2018
                      • 21
                      • USA

                      #11
                      Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                      I found my panel number which is T460FBE2-DB, and when I looked that up the only matching T-con board is P/N BN81-04456A (also called 35-D052600).

                      http://www.shopjimmy.com/catalogsear...&q=T460FBE2-DB

                      Comment

                      • TVTinkerer
                        Member
                        • Jan 2018
                        • 21
                        • USA

                        #12
                        Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                        Originally posted by budm
                        Read post #7 again.
                        I'll try to test it. And when I asked that, post #7 didn't exist yet, it was posted while i was typing.

                        Comment

                        • TVTinkerer
                          Member
                          • Jan 2018
                          • 21
                          • USA

                          #13
                          Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                          Which one is the fuse that I need to test? Is it C_DF1 just above and to the left of the cable that connects to the main board?
                          Attached Files
                          Last edited by TVTinkerer; 01-10-2018, 06:09 PM.

                          Comment

                          • diif
                            Badcaps Legend
                            • Feb 2014
                            • 6978
                            • England

                            #14
                            Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                            Originally posted by TVTinkerer
                            Which one is the fuse that I need to test?
                            It's white with the letter N on it. Up and left from the left hand side of the LVDS connector.

                            Comment

                            • TVTinkerer
                              Member
                              • Jan 2018
                              • 21
                              • USA

                              #15
                              Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                              Finally had a chance to check the voltage, I get 27V on either side of that fuse. I assume that means the fuse is good? Anything else I should check?

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                                You better check your meter and meter setting, there is NO WAY you can have 27Vdc on that T-CON fuse without the T-CON and main board blown up. It should be only 12VDC.
                                Last edited by budm; 01-16-2018, 04:17 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

                                • TVTinkerer
                                  Member
                                  • Jan 2018
                                  • 21
                                  • USA

                                  #17
                                  Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                                  Originally posted by budm
                                  You better check your meter and meter setting, there is NO WAY you can have 27Vdc on that T-CON fuse with out the T-CON and main board blown up. It should be only 12VDC.
                                  I'm an idiot, I had it in AC mode! Looks like it's 12.67-12.68VDC, same reading on both sides of the fuse.
                                  Attached Files
                                  Last edited by TVTinkerer; 01-16-2018, 03:49 PM.

                                  Comment

                                  • maxvalutech
                                    Badcaps Veteran
                                    • Dec 2014
                                    • 804
                                    • australia

                                    #18
                                    Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                                    Just a thought but how do you know menu button was working and are those t-con connectors to screen seated in far enough ?

                                    Comment

                                    • TVTinkerer
                                      Member
                                      • Jan 2018
                                      • 21
                                      • USA

                                      #19
                                      Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                                      Originally posted by maxvalutech
                                      Just a thought but how do you know menu button was working and are those t-con connectors to screen seated in far enough ?
                                      I don't necessarily know the menu button specifically works, but all the others do. I can change the source, adjust volume, power on/off, etc. The menu button would bring up a menu that I obviously wouldn't be able to see, but I just figured if most of them they probably all work.

                                      And yes, the connectors are seated fine, I've double and triple checked that both with the original board as well as the replacement.

                                      I did notice that while the name on the top of the new board I received is the same (V460H1-CH7), the actual model number is different (orig board 35-D046450, new board 35-D052554). But according to some resources I've looked at (such as this eBay listing which shows compatible p/n's: https://www.ebay.com/itm/142518918534) they *should* be interchangeable.

                                      Comment

                                      • TVTinkerer
                                        Member
                                        • Jan 2018
                                        • 21
                                        • USA

                                        #20
                                        Re: Samsung UN46C6400 - TV powers on, backlight comes on, buttons work, but no pic.

                                        I have until the end of today to either fix this TV or return it where I bought it (10 day return policy) if I can't get it working. So I'm pretty much at the end of my rope. Any other ideas?? Is it possible that all the boards are fine, and it's just a bad panel? Everything else seems to work - backlight, sound, buttons, the LED backlight gets brighter when I connect a source, there's just absolutely nothing on the screen.

                                        If that replacement board I got was indeed good, and the other boards appear to be fine, then the only thing left would be the panel itself. No?
                                        Last edited by TVTinkerer; 01-16-2018, 05:27 PM.

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Tynan Dill
                                          Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                          by Tynan Dill
                                          I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                          Upon bringing it home and plugging it up, it showed a standby light.

                                          I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                          The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                          With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                          Assuming...
                                          11-22-2024, 01:46 PM
                                        • m1ch43lzm
                                          HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
                                          by m1ch43lzm
                                          Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
                                          Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
                                          05-12-2025, 08:37 PM
                                        • ohren
                                          Upgrading a Samsung ue55nu7096u with logic board from an ue55ru7105k -- good idea?
                                          by ohren
                                          I hope this is the right forum to post in despite not technically being a repair, but still a question of swapping boards.

                                          I thought I'd explore the possibility to upgrade an existing working Samsung ue55nu7096u with the logic board (and power board if needed) of a newer model (ue55ru7105k) of the same size and appearance (and resolution). The reason being I'd like the extra inputs of that board including component in, an extra HDMI port and bluetooth. Its panel is broken so I have no use for the board otherwise.

                                          The models launched in 2018 and 2019 respectively....
                                          09-08-2023, 05:24 PM
                                        • C152Heavy
                                          Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
                                          by C152Heavy
                                          Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board

                                          Summary for TL-DR readers:
                                          • Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
                                          • Have obtained Samsung schematic & service documents - Can upload if helpful.
                                          • Have read ALL applicable threads
                                          • C1818 and CP820 replaced as low hanging fruit
                                          • CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
                                          • VCC pin (18) of PFC...
                                          01-11-2023, 02:53 PM
                                        • 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
                                        • Loading...
                                        • No more items.
                                        Working...