55" Vizio XVT553SV no power, just orange standby after power surge

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  • mitsu2k
    Senior Member
    • Aug 2013
    • 199
    • USA
    #1

    55" Vizio XVT553SV no power, just orange standby after power surge

    Hello gentlemen!! I'm working on a Vizio XVT553SV tv. What happened is there was a power surge in the home electrical lines that took place with the tv off. However, the tv no longer turns on. The orange Vizio Standby logo lights up orange and never turns to white when the power button is pressed nor does the tv have any audio or video. I did notice however that when the power button is pressed, the standby led goes from bright to dim orange several times. I currently have the back cover off the tv. I have checked the main fuse on the power board as well as all the small fuses on the mainboard and all were good. I am very comfortable working on boards and soldering but I am at a loss for where to start in diagnosing the problem here. Not sure if the problem lies with the power board or with the mainboard. I would greatly appreciate if you guys could help me along with this.

    Thank you!!
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: 55" Vizio XVT553SV no power, just orange standby after power surge

      This is most likely a bad main board on these models. If you post some pictures of inside the unit, it may be possible to rule out the other parts so you know it is the main board at fault.
      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

        • mitsu2k
          Senior Member
          • Aug 2013
          • 199
          • USA
          #3
          Re: 55" Vizio XVT553SV no power, just orange standby after power surge

          Hello Tom, Thank you for your help. The requested photo is attached.
          Attached Files

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: 55" Vizio XVT553SV no power, just orange standby after power surge

              OK, left hand yellow board is your power board.

              Right hand green board (with video inputs) is the main board.

              On the power board there is a power cable which connects to the main board. Can you get a closer shot of around that cable?
              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

                • mitsu2k
                  Senior Member
                  • Aug 2013
                  • 199
                  • USA
                  #5
                  Re: 55" Vizio XVT553SV no power, just orange standby after power surge

                  Hi Tom, these pics may not be clear enough but let me know if I need to take better ones. Thanks!

                  I found someone has some good pics here: https://www.badcaps.net/forum/showth...light=XVT553SV

                  The TV is at my friend's house so I am unable to take new pics at the moment but hopefully the ones I have and the pics from other thread will help.
                  Attached Files
                  Last edited by mitsu2k; 08-25-2013, 10:17 AM.

                    Comment

                    • mitsu2k
                      Senior Member
                      • Aug 2013
                      • 199
                      • USA
                      #6
                      Re: 55" Vizio XVT553SV no power, just orange standby after power surge

                      Any ideas?

                        Comment

                        • aaronwt6
                          Badcaps Veteran
                          • Apr 2013
                          • 855
                          • US
                          #7
                          Re: 55" Vizio XVT553SV no power, just orange standby after power surge

                          I would say this is almost certainly a main board fault. Even if the power supply wasn't working, the Vizio light should turn white when the power button is pressed. The same 5V that runs the standby light also turns it white. I've had a few in this same state. The couple I did have with PS issues were at least outputting 5V and the logo would turn white even though nothing happened beyond that.

                            Comment

                            • aaronwt6
                              Badcaps Veteran
                              • Apr 2013
                              • 855
                              • US
                              #8
                              Re: 55" Vizio XVT553SV no power, just orange standby after power surge

                              Seems these get damaged real easy from brief power outtages. Been the story on most of the Vizios I've picked up. Power goes out, TV never works again.

                                Comment

                                • mitsu2k
                                  Senior Member
                                  • Aug 2013
                                  • 199
                                  • USA
                                  #9
                                  Re: 55" Vizio XVT553SV no power, just orange standby after power surge

                                  Hi Aaron, that's what I sususpected. Do you think it's worth it to try and diagnose the fault on the mainboard or just replace it?

                                    Comment

                                    • aaronwt6
                                      Badcaps Veteran
                                      • Apr 2013
                                      • 855
                                      • US
                                      #10
                                      Re: 55" Vizio XVT553SV no power, just orange standby after power surge

                                      Eeprom chip would be a likely suspect. You could check all the voltage regulators too. I've heard of people having luck with an eeprom swap but I tried two with no success.

                                        Comment

                                        • Ronkirsch
                                          Nashville Ron
                                          • Dec 2015
                                          • 3
                                          • USA
                                          #11
                                          Re: 55" Vizio XVT553SV no power, just orange standby after power surge

                                          I've got the same problem with a Vizio XVT553SV. Power turns the logo orange but never white. Were you ever able to fix yours?

                                            Comment

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