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Grundig 49 VLE 420 BN - no picture

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    Grundig 49 VLE 420 BN - no picture

    I bought this used TV as defective, it does not show any picture or menu screen.
    When it is turned on, there is no picture, but the backlight works.
    The motherboard is ZG7190R-9 and it is probably defective.
    Through ads I can buy a cheap TV Grundig tv 43 gua 7000 Barcelona with a broken screen. How can I find out which motherboard is in that TV because if it doesn't match I wouldn't buy it.
    Stickers from both TVs are attached.
    Attached Files

    #2
    Re: Grundig 49 VLE 420 BN - no picture

    49Vle is a G5 chassis with ZG7190R chassis and NX with ZG2190R chassis. These are not compatible. You have to have a mainboard from a G5 or G7 device. But it has to be 49 inches and the same panel has to be inside. Best only G5. Then pay attention to the white sticker on the CI shaft. There are letters or numbers there. The first three have to be identical, otherwise the mainboard does not match the panel and there is no picture. You can't change panel data.
    Greetings Thomas

    Comment


      #3
      Re: Grundig 49 VLE 420 BN - no picture

      If there is no image, the problem may not be in the motherboard, but in the T-CON, in
      panel slats or in the panel itself.

      Comment


        #4
        Re: Grundig 49 VLE 420 BN - no picture

        Originally posted by thommyX View Post
        49Vle is a G5 chassis with ZG7190R chassis and NX with ZG2190R chassis. These are not compatible. You have to have a mainboard from a G5 or G7 device. But it has to be 49 inches and the same panel has to be inside. Best only G5. Then pay attention to the white sticker on the CI shaft. There are letters or numbers there. The first three have to be identical, otherwise the mainboard does not match the panel and there is no picture. You can't change panel data.
        Greetings Thomas
        Thanks for the information.
        Can you tell me where can I find information which motherboard is in which TV set?

        Comment


          #5
          Re: Grundig 49 VLE 420 BN - no picture

          Originally posted by lotas View Post
          If there is no image, the problem may not be in the motherboard, but in the T-CON, in
          panel slats or in the panel itself.
          There in no separate T-CON board in this TV.

          Comment


            #6
            Re: Grundig 49 VLE 420 BN - no picture

            T-CON can be built into the motherboard itself, it can be a separate module, or it can be soldered onto the strips of the panel itself.

            Comment


              #7
              Re: Grundig 49 VLE 420 BN - no picture

              I think it is in motherboard thats why I think motherboard is the problem.

              Comment


                #8
                Re: Grundig 49 VLE 420 BN - no picture

                Without a photo, I can't tell you where your t-con is.

                Comment


                  #9
                  Re: Grundig 49 VLE 420 BN - no picture

                  Here are the photos.
                  Attached Files

                  Comment


                    #10
                    Re: Grundig 49 VLE 420 BN - no picture

                    This is the T-CON, soldered on the matrix bar, check the fuse and it should have DC + 12V relative to ground.
                    Attached Files

                    Comment


                      #11
                      Re: Grundig 49 VLE 420 BN - no picture

                      There is 11,88 V before and after the fuse (so the fuse is ok) and there is 3,21V on the test point VCC 3,3V. (left corner on the picture).
                      Also, there are folloving voltages on the CN3 on the power board, when the tv is on and backlight is working, PINS 1-14:
                      1 5,13V
                      2. 0V
                      3. 11,92V
                      4. 11,92V
                      5. 11,92V
                      6. 0V
                      7. 0V
                      8. 0V
                      9. 24V
                      10. 3,22V
                      11. 0V
                      12. 0V
                      13. 0,62V
                      14. 3,13V
                      Attached Files

                      Comment


                        #12
                        Re: Grundig 49 VLE 420 BN - no picture

                        need to label the pins, example: Pin #
                        1 FAIL COUNT 0
                        2 ANA-DIM 0
                        3 A13V 9.67
                        4 OD ON/OFF 0
                        5 A13V 9.67
                        6 BLU_PWM 0
                        7 A13V 9.67
                        8 POWER_ON/OFF .103
                        9 A13V 9.67
                        10 GND 0
                        11 GND 0
                        12 GND 0

                        Comment


                          #13
                          Re: Grundig 49 VLE 420 BN - no picture

                          Originally posted by nomoresonys View Post
                          need to label the pins, example: Pin #
                          1 FAIL COUNT 0
                          2 ANA-DIM 0
                          3 A13V 9.67
                          4 OD ON/OFF 0
                          5 A13V 9.67
                          6 BLU_PWM 0
                          7 A13V 9.67
                          8 POWER_ON/OFF .103
                          9 A13V 9.67
                          10 GND 0
                          11 GND 0
                          12 GND 0
                          Pin labeal is on this picture:
                          Attached Files

                          Comment


                            #14
                            Re: Grundig 49 VLE 420 BN - no picture

                            it's hard to see, what is 11 and 12?

                            Comment


                              #15
                              Re: Grundig 49 VLE 420 BN - no picture

                              do further testing on tcon, test the little capacitors for shorts or very low ohms.

                              Comment


                                #16
                                Re: Grundig 49 VLE 420 BN - no picture

                                Originally posted by nomoresonys View Post
                                it's hard to see, what is 11 and 12?
                                11 - dim0
                                12 - dim1
                                13 - dim2
                                14 - bl

                                Comment


                                  #17
                                  Re: Grundig 49 VLE 420 BN - no picture

                                  unhook tcon from mainboard and do those tests on the caps.

                                  Comment


                                    #18
                                    Re: Grundig 49 VLE 420 BN - no picture

                                    Originally posted by nomoresonys View Post
                                    unhook tcon from mainboard and do those tests on the caps.
                                    I do`t think prooblem is on the T-CON, because it have voltages, I think problem is the motherboard.
                                    I already thought to take out the t-con, but for that I have to disassemble everything, remove both plates and the tin cover to get to the t-con.
                                    I will do it when I will have some time.
                                    Last edited by betmen; 07-17-2022, 09:48 AM. Reason: spelling

                                    Comment


                                      #19
                                      Re: Grundig 49 VLE 420 BN - no picture

                                      from the picture there, you have all the access you need, no need to remove it to test the caps, pretty simple basic test.

                                      Comment


                                        #20
                                        Re: Grundig 49 VLE 420 BN - no picture

                                        Originally posted by nomoresonys View Post
                                        from the picture there, you have all the access you need, no need to remove it to test the caps, pretty simple basic test.
                                        I have already tested the ones that are visible, but only a small part of the entire screen panel is accessible through the opening that is visible

                                        Comment

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