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Last chance Bravia. blank or white screen KDL-60EX645

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    Last chance Bravia. blank or white screen KDL-60EX645

    So I'm at my wits end with this TV. I had 2 of these sets bought at the same time. Both went dark with Backlight 6 blink error. Ordered strips, installed strips, worked for 2 weeks, then same error.
    Ordered power board since it has brown area by backlight connector, and has to be the cause of the issue. Instal board, backlights (edgelit) works again, but now no picture. Sound and backlights, but no picture. I can tell by the edgelights its booting up.
    So I start checking the cables and such on the Tcon, and after checking the fuse, the screen starts up and goes all white. At first there were horizontal lines, but they fade and the whole screen goes white.
    That tells me that its possible the panel isn't toast, which is what I figured. If it will go white, its getting signal of some fashion I think, yet after 2 days I can't figure out whats going on.
    One of the TV's panel cracked, so I have 2 of everything to swap out, which quickly eliminates things, to an extent. I've swapped out everything more than once. 2 T-cons, 2 main boards, harnesses, etc.
    I'm a whisper away from just tossing it all and eating the $200 loss for parts bought. I took a voltage reading off the tcon at the fuse, which has written 32v, 2.something Mamps, yet I get 12v, both sides.
    I would be extremely thankful for any suggestions or advice. I figured a driver tab or ribbon on the panel got damaged and that was the issue. Yet when I got a white screen I figured theres hope its not the panel. Yet its the only thing I can't swap out. ugh.

    #2
    Re: Last chance Bravia. blank or white screen KDL-60EX645

    Sounds a lot like the T-con took a shit... SMH
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      #3
      Re: Last chance Bravia. blank or white screen KDL-60EX645

      I have 2 T-cons though, and both were working before. Highly unlikely both would fail while being stored in a box, no?

      Comment


        #4
        Re: Last chance Bravia. blank or white screen KDL-60EX645

        Look at me. I bought 5 for the xbr75x850c and still no picture until forced.

        What happens when you wiggle the LVDS connector cable while thbe tv is on?
        Did I leave the soldering iron on?

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          #5
          Re: Last chance Bravia. blank or white screen KDL-60EX645

          Check voltage around the inductor coils on the tcon.. Is there anything besides 12v?

          Keep in mind.. This is a Sharp LCD panel.
          Did I leave the soldering iron on?

          Comment


            #6
            Re: Last chance Bravia. blank or white screen KDL-60EX645

            inductor coils all have voltage, 12.3v 3.3v and 1.3v
            Fuse resistance is 0.5 ohm
            Not the slightest effect from wiggling LVDS cables, or tabs, or any cables at all. The only thing that made anything happen was when I took the sheild off the T-con and checked voltage. There was a clicking that came from the Power board, and the white screen flickering along with the clicking. After that just white screen. After I swapped T-con boards, its back to black with backlights on.

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              #7
              Re: Last chance Bravia. blank or white screen KDL-60EX645

              Where's your 18 to 26 V, 8v 6.5v. Your secondary powers are not coming up on your T con. When you took the metal shield off and heard the power supply click what you did is you shorted 12 V to ground. You probably touch the metal shield against the fuse. Now I would advise going through your main board and checking every single little pico fuse that Sony puts on those boards.

              Sony is fuse crazy with their boards it's ridiculous
              Last edited by freakaftr8; 01-27-2018, 09:37 PM.
              Did I leave the soldering iron on?

              Comment


                #8
                Re: Last chance Bravia. blank or white screen KDL-60EX645

                Also I should mention the clicking sound and now the white screen probably tells me that you're tcon took a shit. Do you have the part number of the T con?
                Did I leave the soldering iron on?

                Comment


                  #9
                  Re: Last chance Bravia. blank or white screen KDL-60EX645

                  I had the sheild off before plugging the TV on and testing. I was pretty carefull with the multimeter, and cant see how I would have shorted anything.



                  F101 bottom right. I cant even see a slip of the probe being able to touch 2 pads and short something. Yet I wonder if just using the meter could have caused the short?

                  Comment


                    #10
                    Re: Last chance Bravia. blank or white screen KDL-60EX645

                    From the sounds of it you are missing VGH voltage. This will cause the white screen effect. There might be a slight possibility that there are some pico fuses located on the panels source driver boards. You might be able to get in there in check all capacitors and resistors on the panel boards for shorts or opens especially around VGH
                    Did I leave the soldering iron on?

                    Comment


                      #11
                      Re: Last chance Bravia. blank or white screen KDL-60EX645

                      Thing is with 2 T-cons one could have burst in to flames, and I don't see how the second one, that worked fine last used, could give me the same black screen I started with.

                      Comment


                        #12
                        Re: Last chance Bravia. blank or white screen KDL-60EX645

                        Check this transistor for shorts in diode check mode.
                        Attached Files
                        Did I leave the soldering iron on?

                        Comment


                          #13
                          Re: Last chance Bravia. blank or white screen KDL-60EX645

                          Unless the panel shorts and takes the tcon out before y ou know it.

                          Read up on the E701-A3 tcons. Same beast same problems.
                          Did I leave the soldering iron on?

                          Comment


                            #14
                            Re: Last chance Bravia. blank or white screen KDL-60EX645

                            Originally posted by freakaftr8 View Post
                            From the sounds of it you are missing VGH voltage. This will cause the white screen effect. There might be a slight possibility that there are some pico fuses located on the panels source driver boards. You might be able to get in there in check all capacitors and resistors on the panel boards for shorts or opens especially around VGH
                            I'll give the panel boards a check. The driver tabs was my first suspect, as when I was flipping the TV over durring reassembly one of the tab ribbons got twisted up on the frame. Didn't look too damaging, but it was the only thing that I did witness.
                            I swapped the connecting ribbons from the second set, and aside from attempting to swap the tabs, if thats even possible, I'm out of ideas.

                            Thanks a lot for the help though. I'll check the driver boards now.

                            Comment


                              #15
                              Re: Last chance Bravia. blank or white screen KDL-60EX645







                              Here's some pics. I have the driver tab/boards removed off the second tv, yet I can identify any fuses. There are 2 fuses on the right bottom of the T-con that have less than 1v on one side and 0 on the other. Also no continuity across them.

                              Comment


                                #16
                                Re: Last chance Bravia. blank or white screen KDL-60EX645

                                Both main boards are on the frame, but one is just sitting there after being switched out. That’s the most confusing part about this, is since I can just swap out every board or cable it should effectively eliminate the part as the culprit.
                                Essentially the only thing I can’t swap is the panel.

                                Comment


                                  #17
                                  Re: Last chance Bravia. blank or white screen KDL-60EX645

                                  not sure I understand your "Also no continuity across them" statement... but if it is correct (meaning your technique for determining this), then that means those fuses are blown.

                                  Comment


                                    #18
                                    Re: Last chance Bravia. blank or white screen KDL-60EX645

                                    Originally posted by budwich View Post
                                    not sure I understand your "Also no continuity across them" statement... but if it is correct (meaning your technique for determining this), then that means those fuses are blown.
                                    I used a continuity tester, yet I'm thinking there not fuses. The 2 arrows on the far left, 103 & 242, have resistance of 2300 ohm and 6300 ohm. Which would explain why my 1 AA battery and bulb continuity tester wont show continuity.

                                    Last edited by PlayDoh; 01-28-2018, 09:12 PM.

                                    Comment


                                      #19
                                      Re: Last chance Bravia. blank or white screen KDL-60EX645



                                      The arrows on the right are just the fuses I checked. I've noted they have letters, and the ones on the left are numbers only. Resistor?
                                      Last edited by PlayDoh; 01-28-2018, 09:14 PM.

                                      Comment


                                        #20
                                        Re: Last chance Bravia. blank or white screen KDL-60EX645

                                        OK so YD is the fuse. That's open. 1r0 is a 1 ohm .also open. You got tcon problems man. And I would be expecting a problem with the panel replace that fuse in that resistor power of the tcon with no panel connected. Check for voltages around coils you should have higher voltages some around 28v in some areas for HVDD

                                        103 is a 10kohm. 242 is 2.4kohm.

                                        If I'm understanding you YD is open right?
                                        Last edited by freakaftr8; 01-28-2018, 09:59 PM.
                                        Did I leave the soldering iron on?

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