Emerson LC320EM2 back lights on but no picture

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  • Gorrillasnot
    Badcaps Veteran
    • Dec 2013
    • 316
    • USA

    #1

    Emerson LC320EM2 back lights on but no picture

    Hello,

    I bought this TV for $20 at a rummage sale which I don't think is too bad if it's fixable.

    The symptoms are I can plug it in and I get a standby light. Press the power button and the led blinks several times then goes out. Then the back lights turn on (and stays on) but no picture is shown. I also get sound.
    I haven't had a chance to open it up yet, but I'm thinking its something in the inverter part of the board.
    I searched on here to see if anyone else had similar issues with this TV but all I found were posts with no power issues.

    any ideas?

    thanks
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Emerson LC320EM2 back lights on but no picture

    If you do have backlights then inverter circuit is OK, inverter is for backlights to provide light source so you can see pictures on the LCD panel. It sounds to me that either the T-CON board is not getting the power from the main board, or SMD fuse on the T-CON board is blown, or the main board is not sending the signals to the T-CON.
    Last edited by budm; 05-16-2014, 03:05 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

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30985
      • Albion

      #3
      Re: Emerson LC320EM2 back lights on but no picture

      if it was the invertor, the backlight wouldnt stay on.
      maybe a psu problem - cant say until it's open.

      Comment

      • Gorrillasnot
        Badcaps Veteran
        • Dec 2013
        • 316
        • USA

        #4
        Re: Emerson LC320EM2 back lights on but no picture

        I opened it up.
        looks like the power and inverter are on the same board and the main and t-con on the other board.
        No signs of obvious bad caps or burnt components.
        not sure what to do next.
        Attached Files

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30985
          • Albion

          #5
          Re: Emerson LC320EM2 back lights on but no picture

          that's a clean layout.

          it could have done with a heatsink on the main chip though.

          did you check the connectors are in o.k. ?

          Comment

          • Gorrillasnot
            Badcaps Veteran
            • Dec 2013
            • 316
            • USA

            #6
            Re: Emerson LC320EM2 back lights on but no picture

            I checked the cables and made sure all were firmly seated.
            Also on the PSU I checked all the jumpers with a voltage labeled next to them. There were 3 or 4 21v jumpers and they measured right on. and I found one 3.3v that was also right on.

            Comment

            • stj
              Great Sage 齊天大聖
              • Dec 2009
              • 30985
              • Albion

              #7
              Re: Emerson LC320EM2 back lights on but no picture

              you see that board at the top-center,
              i suspect that has a second connector on it you cant see.

              the panel connectors are not on the edge - they are on the back.
              that board probably acts as an extension cable.

              Comment

              • Gorrillasnot
                Badcaps Veteran
                • Dec 2013
                • 316
                • USA

                #8
                Re: Emerson LC320EM2 back lights on but no picture

                i don't see any other connectors just by looking but i also haven't disassembled the metal frame yet either.

                Do u think the issue is with the main/t-con combo board?

                thanks

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Emerson LC320EM2 back lights on but no picture

                  OK, this LCD panel may have integrated T-CON or T-CON is integrated into the main board.
                  Can you see the LCD panel number sticker? I need it so I look up the spec sheet of this panel.
                  I can seven LVDS pairs on the main board.
                  http://www.shopjimmy.com/media/catal...001-dm-top.jpg

                  I cannot find the info for UK32MXK LCD panel.
                  Last edited by budm; 05-16-2014, 05:29 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

                  • Gorrillasnot
                    Badcaps Veteran
                    • Dec 2013
                    • 316
                    • USA

                    #10
                    Re: Emerson LC320EM2 back lights on but no picture

                    I can only find one sticker on the back of the panel and if I'm reading it right I think it is P/N UK32BXA
                    Attached Files

                    Comment

                    • Gorrillasnot
                      Badcaps Veteran
                      • Dec 2013
                      • 316
                      • USA

                      #11
                      Re: Emerson LC320EM2 back lights on but no picture

                      If the t-con is integrated into that top board does that means the TV is likely not fixable?

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Emerson LC320EM2 back lights on but no picture

                        That is correct. So far no info about this LCD panel UK32BXA.
                        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

                        • Gorrillasnot
                          Badcaps Veteran
                          • Dec 2013
                          • 316
                          • USA

                          #13
                          Re: Emerson LC320EM2 back lights on but no picture

                          ugh! that sux..was worth a gamble though I guess

                          Comment

                          • Caleb
                            Smokin IC's
                            • Feb 2013
                            • 645
                            • USA

                            #14
                            Re: Emerson LC320EM2 back lights on but no picture

                            That power board is worth at least 40$ on ebay. Its a bit of a hassle but it would get your money back
                            Liberating magic smoke one part at a time

                            Comment

                            • Gorrillasnot
                              Badcaps Veteran
                              • Dec 2013
                              • 316
                              • USA

                              #15
                              Re: Emerson LC320EM2 back lights on but no picture

                              yep that's what i was thinking. part it out and try to break even or maybe even make a couple bucks.

                              thanks everyone

                              Comment

                              • Gorrillasnot
                                Badcaps Veteran
                                • Dec 2013
                                • 316
                                • USA

                                #16
                                Re: Emerson LC320EM2 back lights on but no picture

                                I was tinkering some more with this TV and decided to take the metal frame off and get a look at the board that the LVDS cable attaches to.

                                There is what appears to be a voltage regulator at location IC5 in the pic.
                                It has 1117 written on it.
                                I tested it with the TV powered on and got the following readings 0.01, 0.04, and 0.72.
                                Does that sound like its ok?

                                Are there any fuses or other things I could check on this board?

                                thanks
                                Attached Files

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Emerson LC320EM2 back lights on but no picture

                                  So it does have T-CON on the panel, the fuse is the SMD green fuse on the left of the connector (CN1) with 20 printed on top (F21? marking on the board). There is also small copper pad with 'VDD IN' for incoming voltage test point.
                                  Last edited by budm; 05-20-2014, 01:53 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

                                  • Gorrillasnot
                                    Badcaps Veteran
                                    • Dec 2013
                                    • 316
                                    • USA

                                    #18
                                    Re: Emerson LC320EM2 back lights on but no picture

                                    With power on it measures 0.29v on both ends of the fuse and at the VDD IN test point.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Emerson LC320EM2 back lights on but no picture

                                      This means the main A/V board is not turning the power on or the T-con is shorted. Try checking both ends of the fuse to chassis ground for shorts.
                                      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

                                      • Gorrillasnot
                                        Badcaps Veteran
                                        • Dec 2013
                                        • 316
                                        • USA

                                        #20
                                        Re: Emerson LC320EM2 back lights on but no picture

                                        I'm still learning..To test the fuse would I set my DMM to ohm and then with TV unplugged test each end of the fuse?

                                        thanks

                                        Comment

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