LG 37LC7D UK has image has no audio

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: LG 37LC7D UK has image has no audio

    Yep 2V is fine for an on signal. The 3.4V pin needs to measure around 3.4V.
    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

    • bleed4me
      Senior Member
      • Nov 2015
      • 122
      • USA

      #22
      Re: LG 37LC7D UK has image has no audio

      Ok tom66 I triple checked these numbers and here are the new values


      #1
      3.4on-2.49
      GND-0
      6.5-6.54
      A DIM-.02
      GND-0
      ST 5V BURST-5.29
      DIM-.16
      ERR INV-.85
      CTRL-3.25
      GND-0
      ST5V-5.29
      ON/OFF-3.03
      ACD-5.17


      #2
      GND-0
      12V-13.1
      GND-0
      3.4V-3.63
      GND-0
      6.5V-6.5
      now the remaining 4 pins I dont understand the board but here are the values
      0
      0
      .42
      .43

      Comment

      • bleed4me
        Senior Member
        • Nov 2015
        • 122
        • USA

        #23
        Re: LG 37LC7D UK has image has no audio

        Now riddle me this tom66 tried it again and check out these values


        #1
        3.4on-2.38
        GND-0
        6.5-6.17
        A DIM-1.6
        GND-0
        ST 5V BURST-5.05
        DIM-3.33
        ERR INV-.81
        CTRL-3.10
        GND-0
        ST5V-5.05
        ON/OFF-2.88
        ACD-4.93


        #2
        GND-0
        12V-12.71
        GND-0
        3.4V-3.48
        GND-0
        6.5V-6.16
        now the remaining 4 pins I dont understand the board but here are the values
        0
        0
        .45
        .45

        Comment

        • bleed4me
          Senior Member
          • Nov 2015
          • 122
          • USA

          #24
          Re: LG 37LC7D UK has image has no audio

          Values always change when I turn it off and bring it back up. One question I have is while the tv is off should any of these have a voltage value to them? Another thing is I mentioned a random video earlier I saw and wonder if this could be my problem.

          https://www.youtube.com/watch?v=b-bwX8_Ys70

          Comment

          • stj
            Great Sage 齊天大聖
            • Dec 2009
            • 30917
            • Albion

            #25
            Re: LG 37LC7D UK has image has no audio

            you really need a full recap.
            specially the small ones near the opto isolators.

            Comment

            • bleed4me
              Senior Member
              • Nov 2015
              • 122
              • USA

              #26
              Re: LG 37LC7D UK has image has no audio

              Appears a full recap is getting alot of votes so a full recap will be in the works. 2 questions though... This will sound rediculous but is that monster of a cap in the middle included in this recap and are those with what it appears to be some kind of shrink tubing are those caps as well and if so why are they covered like that?
              Attached Files

              Comment

              • stj
                Great Sage 齊天大聖
                • Dec 2009
                • 30917
                • Albion

                #27
                Re: LG 37LC7D UK has image has no audio

                the high voltage ones can stay.
                the plastic cap is so you cant touch the can because they are rated at several hundred volts.

                Comment

                • bleed4me
                  Senior Member
                  • Nov 2015
                  • 122
                  • USA

                  #28
                  Re: LG 37LC7D UK has image has no audio

                  Just so we are on the same page the 4 small ones on the board with the shrink tubing are high voltage but get replaced?
                  Last edited by bleed4me; 11-06-2015, 09:02 PM.

                  Comment

                  • stj
                    Great Sage 齊天大聖
                    • Dec 2009
                    • 30917
                    • Albion

                    #29
                    Re: LG 37LC7D UK has image has no audio

                    i'm refering to the 2 big ones in the center.
                    the small things your refering to are inductors if they are marked with "L"before the number on the board.

                    Comment

                    • bleed4me
                      Senior Member
                      • Nov 2015
                      • 122
                      • USA

                      #30
                      Re: LG 37LC7D UK has image has no audio

                      OK perfect...I wondered what those were and now I know...thank you for sharing your insight! I will get the ball rolling on doing a full recap...

                      Comment

                      • bleed4me
                        Senior Member
                        • Nov 2015
                        • 122
                        • USA

                        #31
                        Re: LG 37LC7D UK has image has no audio

                        OK riddle me this that last photo is a stock picture of my board on shopjimmy and has 2 monster caps on it...if you look at the pictures I posted earlier of my actual board there is only one monster cap...what's that about?

                        Comment

                        • vinceroger69
                          Badcaps Legend
                          • Mar 2012
                          • 6714
                          • uk

                          #32
                          Re: LG 37LC7D UK has image has no audio

                          The difference with two capacitors maybe one board is for 110 volts maybe the other board is for 240 volts im not 100% sure.
                          Last edited by vinceroger69; 11-07-2015, 04:11 AM.

                          Comment

                          • vinceroger69
                            Badcaps Legend
                            • Mar 2012
                            • 6714
                            • uk

                            #33
                            Re: LG 37LC7D UK has image has no audio

                            please ignore you have already checked what i was going to say in post 1
                            Last edited by vinceroger69; 11-07-2015, 05:00 AM.

                            Comment

                            • bleed4me
                              Senior Member
                              • Nov 2015
                              • 122
                              • USA

                              #34
                              Re: LG 37LC7D UK has image has no audio

                              Just wanted to give an update on how the recap went... 18 caps total replaced and after an undisclosed amount of time has passed I know have a working tv WITH SOUND!!!! I just want to thank every single one of you for your knowledge and help. I could not have done it without you and it is much appreciated. You guys nailed it to a T...thank you so much. Im couldnt be happier that I found this forum.
                              Last edited by bleed4me; 11-12-2015, 10:24 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
                              • Hakuu
                                LG OLED77G1PUA - No Video / Audio after a TCON Board change and Software Update
                                by Hakuu
                                Hi There,

                                This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.

                                After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.

                                More Details

                                TV Model - LG OLED77G1PUA

                                Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt...
                                07-12-2023, 02:37 PM
                              • canadaboy25
                                Panasonic TC-P54VT25 No image. A or D board?
                                by canadaboy25
                                I have a Panasonic TC-P54VT25 that will power on and prime the display but there is no image at all.

                                The panel is primed as there is a slight glow from the entire panel. This means the problem should be logic related. The service manual also confirms this and recommends replacing the A or the D board.

                                I have tried to get the TV to display the test sequence but I have been unable to and I don't even know if this TV has a test sequence or not. I tried following tom66's instructions in post #3 on this thread https://www.badcaps.net/forum/showthread.php?t=26790. There was...
                                01-17-2021, 01:06 AM
                              • grimacelord
                                MacBook Air 2337 - Right I/O Board Audio IC - Alternative Replacement?
                                by grimacelord
                                Hello,

                                I'm working on a MacBook Air A2337 that had liquid damage on the right I/O board. I ultrasonic cleaned the board and it all functions except the computer has no audio. I tried reballing the audio IC which is TAS5770AC0, but that did not restore audio. I could just replace the entire board, but I wanted to see if replacing the audio IC would fix it first. Mouser has a similar audio IC in stock which is TAS5770LC0YFFR, but I wasn't sure if it is compatible. I was just wondering if anyone knew if I could use the one from mouser as an acceptable replacement or if I need to purchase...
                                12-11-2023, 11:13 AM
                              • Loading...
                              • No more items.
                              Working...