Vizio VX32L No picture, sound, or backlight

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  • johnboy1313
    Badcaps Legend
    • Nov 2012
    • 1959
    • USA

    #1

    Vizio VX32L No picture, sound, or backlight

    When turned on, light changes from amber to white. No flicker on screen, no audible click, nothing. Only way to get the light to go back to amber is to unplug the unit.

    Voltage regulators on main board

    U7
    AMC1117
    F0647J
    3.30
    1.08
    0.00

    U33
    same as U7
    5.17
    3.30
    2.06

    U9
    same as U7
    3.30
    1.50
    0.25

    U8
    same as U7
    5.20
    3.30
    2.06

    U4
    same as U7
    5.18
    3.33
    2.08

    U2
    same as U7
    5.18
    3.29
    2.05

    U3
    AZ7805T
    646J20
    11.92
    0.00
    5.04

    U10
    1084
    0648BL
    5.15
    2.63
    1.37

    All marked voltages from power supply appear to be normal. I've got 1.03V at A from the PS to the main and 0.01V at B. ON/OFF is 3.03V

    I don't know what A or B should measure. From what I've read, it looks like U7 is bad, which from what I've also read, is pretty common with these units.

    Right now, I'm kinda ticked off. I spent money on a part for another TV, just to see the same issues. I'd like to get this one going to get my mind off the other one.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Vizio VX32L No picture, sound, or backlight

    U7 is bad; the output should be 1.25V.
    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

    • johnboy1313
      Badcaps Legend
      • Nov 2012
      • 1959
      • USA

      #3
      Re: Vizio VX32L No picture, sound, or backlight

      I jacked up the board removing the old regulator. Don't know if it's salvageable. Kinda pissed right now.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Vizio VX32L No picture, sound, or backlight

        It should be repairable if the damage isn't too bad. Post a picture. Removing regulators is done with careful application of solder to all of the pins. Then apply heat to each end while pushing on it with a small rod.
        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

        • johnboy1313
          Badcaps Legend
          • Nov 2012
          • 1959
          • USA

          #5
          Re: Vizio VX32L No picture, sound, or backlight

          It's done. I don't even want to post a pic I blew molten solder all over. I'm just super ticked off right now.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Vizio VX32L No picture, sound, or backlight

            It is most likely repairable if you trace the tracks. They are generally very large and wires can be bodged to them.

            Here is how to remove a regulator (not my video):
            https://www.youtube.com/watch?v=cNFz...e=plcp&t=8m45s

            He cleans the pads using a vacuum pump. That is optional but makes soldering the new one on easier.
            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

            • johnboy1313
              Badcaps Legend
              • Nov 2012
              • 1959
              • USA

              #7
              Re: Vizio VX32L No picture, sound, or backlight

              Yeah, that's the one I used, only I got impatient and removed the old regulator before I watched how he did it. It might be OK, but I'm going to have to do the regulator again. Now I'm getting

              3.29
              2.35
              2.35

              The amber light comes on and that's it. No power at any of the outputs of the PS other than the 5V. No 12V, no 24V, no 3V at ON/OFF. Seems like I really screwed the pooch this time. I should probably call it quits before it costs me.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Vizio VX32L No picture, sound, or backlight

                Danger, Will Robinson! It should be 1.25V. Did you use a -33 type??? You need to use a plain "1117". I hope the processor is OK with 2.35V instead of 1.25V.

                edit: Ah, I figured it out -- you've got a short between ADJ and OUT... and ADJ isn't grounded.
                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

                • johnboy1313
                  Badcaps Legend
                  • Nov 2012
                  • 1959
                  • USA

                  #9
                  Re: Vizio VX32L No picture, sound, or backlight

                  Do you think I screwed the PS up in the process? I see that the power on button is attached to the main. Does the PS get 12V from the main or does the main get 12V from the PS

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Vizio VX32L No picture, sound, or backlight

                    I think the main processor is at risk of damage with that regulator in place. ****DO NOT**** run that main board any longer with the 2.35V going into the 1.2V CPU. I sure hope the CPU is OK. If it is failed, you will need a new main board.

                    It is VERY difficult (nigh impossible) to damage a modern LCD TV power supply by electrically shorting it or disconnecting it. Even directly shorting it out, it will just go into lock-out mode until you unplug it and plug it back in again. You'd have to take to it with a hammer or soak it in water...

                    On most TVs, the PSU only generates voltages, going to the main and inverter, and only receives low-level control signals like PS-ON.
                    Last edited by tom66; 11-23-2012, 06:10 PM.
                    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

                    • johnboy1313
                      Badcaps Legend
                      • Nov 2012
                      • 1959
                      • USA

                      #11
                      Re: Vizio VX32L No picture, sound, or backlight

                      Why would there be no outputs from the PS then? Even with the main unplugged, there is nothing coming from the PS. Looks like I've got a piece of trash here.

                      Edit, so it may not be getting the PS_ON signal. Hmm.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Vizio VX32L No picture, sound, or backlight

                        It's just in standby. If you have a lit logo, then the PSU has standby. The fault usually affects the first startup checks the TV does so it doesn't yet turn on the power supply fully.
                        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

                        • johnboy1313
                          Badcaps Legend
                          • Nov 2012
                          • 1959
                          • USA

                          #13
                          Re: Vizio VX32L No picture, sound, or backlight

                          Looks like I did mess something up. I put a second regulator in and now I have
                          3.29
                          0.50
                          1.05

                          There are no pads left to solder the regulator to. Like I said earlier, I bet this thing's pretty well shot. I'd try jumper wires, but I don't even know where to put them.

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Vizio VX32L No picture, sound, or backlight

                            Pics, or it didn't happen. This thing uses 3.3V in, 1.25V out, and one pin grounded. If you can find appropriate taps, it's bodgable.
                            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

                            • johnboy1313
                              Badcaps Legend
                              • Nov 2012
                              • 1959
                              • USA

                              #15
                              Re: Vizio VX32L No picture, sound, or backlight

                              So, if 3.3 is the top pin, is the bottom pin ground? Why am I only getting .5V at the out? What do you wanna see pics of? I'll post em now. I've cooled down a bit.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: Vizio VX32L No picture, sound, or backlight

                                I think you've replaced a regulator with a non-regulator. No way any working regulator will have more on adjust/ground than on the output. Something is wrong.
                                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

                                • johnboy1313
                                  Badcaps Legend
                                  • Nov 2012
                                  • 1959
                                  • USA

                                  #17
                                  Re: Vizio VX32L No picture, sound, or backlight

                                  Possibly, it looks just like the one I took out and say "1117" on it.





                                  Comment

                                  • kevinm34232
                                    Badcaps Legend
                                    • May 2012
                                    • 1884
                                    • USA

                                    #18
                                    Re: Vizio VX32L No picture, sound, or backlight

                                    John post some pics of that area, and what's the main board part # off the white sticker?

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Vizio VX32L No picture, sound, or backlight

                                      I've seen far worse..... But I think the CPU will be damaged if you just keep tacking on random regulators! And it will not obviously show any signs as 1.2V will be for high speed video processor... not used much in standby.
                                      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

                                      • johnboy1313
                                        Badcaps Legend
                                        • Nov 2012
                                        • 1959
                                        • USA

                                        #20
                                        Re: Vizio VX32L No picture, sound, or backlight

                                        So, even though they have the same number on them, they're not the same regulator?

                                        Comment

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