KDL-37XBR6 has no picture but has sound

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  • adrianluna350
    New Member
    • Dec 2014
    • 2
    • USA

    #41
    Re: KDL-37XBR6 has no picture but has sound

    I have this same issue. My fuse on the tcon is good but my 12v is down to 2.2v. There doesn't seem to be a dead short on the back side of the tcon fuse so I'm not sure if the Tcon is holding the 12v down or the supply from the main is low.

    Comment

    • adrianluna350
      New Member
      • Dec 2014
      • 2
      • USA

      #42
      Re: KDL-37XBR6 has no picture but has sound

      Update***** When I unload the LVDS cable to the Tcon, the 12v comes up to 7.7v on the BU board. Still not high enough so I'm assuming there's an issue on the BU with a regulator or something to that effect. Does anybody have a schematic to the BU?

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #43
        Re: KDL-37XBR6 has no picture but has sound

        Did you read post 31, 33, and the whole thread?
        https://www.badcaps.net/forum/showpo...3&postcount=33
        Last edited by budm; 12-02-2014, 10:50 AM.
        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

        • Lyskar
          New Member
          • Dec 2014
          • 8
          • USA

          #44
          Re: Sony KDL-37XBR6 has no picture but has sound

          Originally posted by c0olasian
          Hello everyone, I'm new to this forum. I have searched and still had questions. Today I turned on my TV and I get no picture. There is sound, and the screen seems to be on. It blinks when I search through the channels....
          I have an HDTV with the same issue as c0olasian. Lit, blank screen.
          Green LED on the bottom right of the transparent panel. No red solid nor blinking leds(Thank God!).

          Screen reacts to the home button, channel change and there is sound, different for each channel and input. I have already memorize the menus and controls and tried the factory resets. No image, color bars or other hope... so I Googled and ended up here.

          Reading thru, I noticed c0olasian never responded after going to do the voltage reading on the Tcon. Hopefully he is all right. I think JONESER was as worried on #26 as I was opening my set. I have my Craftsman multimeter and other tools ready.

          I have fixed and soldered PC servers, laptops, LCD monitors, other peoples HDTVs and computers down to cell phones with no personal issues but with this HDTV I'm getting sweaty palms.

          For now I will try #27 tomorrow. I have a 4 year old son bouncing all over and I'm afraid of him knocking over the HDTV or touching a live circuit. I'm a soldering expert and my soldering iron is fine tipped.

          Comment

          • jts1957
            Member
            • Dec 2008
            • 38

            #45
            Re: KDL-37XBR6 has no picture but has sound

            I have an HDTV with the same issue as c0olasian. Lit, blank screen.
            Same Make?
            Same Model?

            Comment

            • Lyskar
              New Member
              • Dec 2014
              • 8
              • USA

              #46
              Re: KDL-37XBR6 has no picture but has sound

              Originally posted by jts1957
              Same Make?
              Same Model?
              Sony KDL-37XBR6 Manuf. May 2008

              And I just tested the Tcon board and no 12 volts coming in.
              EDIT 10 minutes later:
              I now have the BU out to test.
              EDIT: I'm up to #37 on this thread.
              Last edited by Lyskar; 12-07-2014, 11:56 AM. Reason: I now have the BU out to test ... eh repair

              Comment

              • Lyskar
                New Member
                • Dec 2014
                • 8
                • USA

                #47
                Re: KDL-37XBR6 has no picture but has sound


                It worked!! I put in a blade car fuse holder and 5 amp fuse, turned it on and the image is back baby!! I've put the back panel back on and it's still running.

                Comment

                • Lyskar
                  New Member
                  • Dec 2014
                  • 8
                  • USA

                  #48
                  Re: KDL-37XBR6 has no picture but has sound

                  It's not fair! It's shut itself off! rapid blinking twice red led labeled "standby".

                  dag nabbit!!

                  Comment

                  • Lyskar
                    New Member
                    • Dec 2014
                    • 8
                    • USA

                    #49
                    Re: KDL-37XBR6 has no picture but has sound

                    I unplugged it from the power, then I unplug the Tcon from the BU and plugged the power back in. it's back to no pic(weird fading white from left to right) but has audio or static audio. I removed the power then Isolated the Tcon from J1 and J2, then left J301 inserted. Same twice blinking red standby light. all arrows point to the Tcon. at least I know its under $50 on eBay.
                    Last edited by Lyskar; 12-07-2014, 04:28 PM. Reason: more observations

                    Comment

                    • Lyskar
                      New Member
                      • Dec 2014
                      • 8
                      • USA

                      #50
                      Re: KDL-37XBR6 has no picture but has sound

                      I can't decide on whether to get Seller: masessum to repair it and possibly last for another 5 years, the self repair kit is out of the question since I'm not that micro good or get a "NEW"? from Seller: gromm-hellscream/e-earth and up in the same hole in 5 years....
                      so many choices.

                      Comment

                      • Lyskar
                        New Member
                        • Dec 2014
                        • 8
                        • USA

                        #51
                        Re: KDL-37XBR6 has no picture but has sound

                        The Tcon came in. tested it with the "heatsink" jellos still in place and the image came on but solarized. I know I have to factory reset it. Carefully took it apart again. I took off that shitty jello squares on it, cleaned the chips(U602, U601, U801, U21) and the large transistor :U804 with 90 proof rubbing alcohol since the jellos gave off some type of oily residue.

                        q-tips and cotton balls from my medical-kit HELPED.

                        Took out my pack of heatsinks, artic-ice CPU thermal paste and superglue. I applied a dab of thermal paste and left enough space for the superglue to lock into the chips. I CAREFULLY placed them on and a micro dab of superglue.
                        That should fix the t-con problem for the next decade.

                        The flip down thermal cover wont fit so I just left it as it and screwed the board without it.
                        after entering service mode on the remote. I reset to factory and I'm good to go. Still enjoying tv with my family without an issue.


                        I hope it went well for anyone else before me. will keep everyone posted on its progress.
                        Even on Wikipedia thermal pads are crap vs. thermal paste.

                        I cant believe the EPA allows companies to continue using thermal pads even after so many Tcon complaints.
                        If I didn't care about money this HDTV would have ended up in the landfill.
                        Last edited by Lyskar; 12-21-2014, 05:45 PM. Reason: chip names and ignored EPA complaint

                        Comment

                        • jimmynas
                          New Member
                          • Oct 2015
                          • 1
                          • costa rica

                          #52
                          Re: KDL-37XBR6 has no picture but has sound

                          Originally posted by Lyskar
                          The Tcon came in. tested it with the "heatsink" jellos still in place and the image came on but solarized. I know I have to factory reset it. Carefully took it apart again. I took off that shitty jello squares on it, cleaned the chips(U602, U601, U801, U21) and the large transistor :U804 with 90 proof rubbing alcohol since the jellos gave off some type of oily residue.

                          q-tips and cotton balls from my medical-kit HELPED.

                          Took out my pack of heatsinks, artic-ice CPU thermal paste and superglue. I applied a dab of thermal paste and left enough space for the superglue to lock into the chips. I CAREFULLY placed them on and a micro dab of superglue.
                          That should fix the t-con problem for the next decade.

                          The flip down thermal cover wont fit so I just left it as it and screwed the board without it.
                          after entering service mode on the remote. I reset to factory and I'm good to go. Still enjoying tv with my family without an issue.


                          I hope it went well for anyone else before me. will keep everyone posted on its progress.
                          Even on Wikipedia thermal pads are crap vs. thermal paste.

                          I cant believe the EPA allows companies to continue using thermal pads even after so many Tcon complaints.
                          If I didn't care about money this HDTV would have ended up in the landfill.
                          Hello, you buy a new t com or repair the old.

                          Comment

                          • quattr0
                            New Member
                            • Nov 2015
                            • 3
                            • U.S.A.

                            #53
                            Re: KDL-37XBR6 has no picture but has sound

                            Back from the dead!!!

                            Model: KDL-37XBR6

                            Issue:
                            Picture is almost normal when the TV is first powered on from being cold.
                            No picture after ~15 sec then alternation between funky lines and blank
                            .
                            Sound works when a valid station is chosen.
                            No blink code. Solid green power.

                            Tried throwing money at it as I was short on time
                            New T-con from shopjimmy.com produced the same issues.

                            Found this thread and broke out the multi-meter.

                            I have 12V on the T-con fuse.

                            I see where some fuses on the main board are listed. All of them check out on continuity and ohm test avg ~0.3

                            I'm guessing that the voltages printed near the fuses on the main board are what i'm supposed to find there. Most of these are not even close(i.e. calls for 36v has ~12v) ( calls for 24v has ~8v). I'm assuming something in a power circuit is to blame.

                            Looking for some help on where to look next. I looked at the service manual and my head started spinning.

                            Pics of the issues are attached.
                            Attached Files

                            Comment

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales

                              #54
                              Re: KDL-37XBR6 has no picture but has sound

                              Post #31 points you to the service manual and the power supply can be found on page 70.
                              Check the voltages given on CN601 & CN602
                              Last edited by dick_barton; 03-26-2016, 12:09 PM.
                              Willing to help but I'm no expert.

                              Comment

                              • quattr0
                                New Member
                                • Nov 2015
                                • 3
                                • U.S.A.

                                #55
                                Re: KDL-37XBR6 has no picture but has sound

                                CN601 - checks out
                                24.2V on pin 1-4

                                CN602 - looks like higher voltage than expected on pin 4 and 5. Calls for 13v unreg.
                                pin value
                                1
                                2
                                3 - 3.3
                                4 - 16.7
                                5 - 16.7
                                6
                                7
                                8
                                9
                                10 - 12.3
                                11 - 12.3
                                12 - 12.3
                                13

                                Comment

                                • dick_barton
                                  Badcaps Legend
                                  • Aug 2015
                                  • 6642
                                  • Wales

                                  #56
                                  Re: KDL-37XBR6 has no picture but has sound

                                  6-7-8-9-10 = GND
                                  10-11-12 = 12.3V

                                  16.3V seems a little high but it is an unregulated voltage so probably OK.
                                  Other than that the power supply voltages all appear to be within limits.
                                  Willing to help but I'm no expert.

                                  Comment

                                  • jts1957
                                    Member
                                    • Dec 2008
                                    • 38

                                    #57
                                    Re: KDL-37XBR6 has no picture but has sound

                                    Originally posted by dick_barton
                                    6-7-8-9-10 = GND
                                    10-11-12 = 12.3V

                                    16.3V seems a little high but it is an unregulated voltage so probably OK.
                                    Other than that the power supply voltages all appear to be within limits.
                                    Pin 10 cannot be both ground and 12.3V

                                    Comment

                                    • dick_barton
                                      Badcaps Legend
                                      • Aug 2015
                                      • 6642
                                      • Wales

                                      #58
                                      Re: KDL-37XBR6 has no picture but has sound

                                      I missed the very point I was trying to make earlier. ie pin designators mixed up Thanks for pointing out.
                                      2nd attempt
                                      Pins 6,7,8,9,10 = Gnd
                                      Pins 11,12,13 = Reg 12V
                                      Last edited by dick_barton; 03-27-2016, 04:36 AM.
                                      Willing to help but I'm no expert.

                                      Comment

                                      • quattr0
                                        New Member
                                        • Nov 2015
                                        • 3
                                        • U.S.A.

                                        #59
                                        Re: KDL-37XBR6 has no picture but has sound

                                        Originally posted by dick_barton
                                        I missed the very point I was trying to make earlier. ie pin designators mixed up Thanks for pointing out.
                                        2nd attempt
                                        Pins 6,7,8,9,10 = Gnd
                                        Pins 11,12,13 = Reg 12V
                                        You are correct.
                                        I was juggling my 6mo old while typing that reply.

                                        CN602 - corrected findings.
                                        pin value
                                        1
                                        2
                                        3 - 3.3
                                        4 - 16.7
                                        5 - 16.7
                                        6 - ground
                                        7 - ground
                                        8 - ground
                                        9 - ground
                                        10 - ground
                                        11 - 12.3
                                        12 - 12.3
                                        13 - 12.3

                                        Comment

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