Vizio E480i-B2

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  • imraneesa
    New Member
    • Dec 2016
    • 6
    • trinidad & tobago
    #1

    Vizio E480i-B2

    Hi all
    I am trying to troubleshoot the above mentioned tv power supply board. The pwm ic Ld7913 was bad and I changed it. Also R915 was open and one zener diode was short.

    There is one diode in the secondary section for standby 5v was short also.

    After replacing all bad parts now I am only getting 1.75v on vcc pin of pwm ic. Any help will be highly appreciated. Thank you. There is also another ic that detects AC i guess IN1s101.
    Tags: None
    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa
      #2
      Re: Vizio E480i-B2

      LD7913 shows as a mosfet. What pwm are you talking about?
      I assume no responsibility for any stupid suggestions I might post.

        Comment

        • imraneesa
          New Member
          • Dec 2016
          • 6
          • trinidad & tobago
          #3
          Re: Vizio E480i-B2

          Originally posted by dskall
          LD7913 shows as a mosfet. What pwm are you talking about?
          Ld7913JGM6 is 5 pin Ic

            Comment

            • imraneesa
              New Member
              • Dec 2016
              • 6
              • trinidad & tobago
              #4
              Re: Vizio E480i-B2

              Here is the picture of ic
              Attached Files

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4640
                  • Russia
                  #5
                  Re: Vizio E480i-B2

                  Try also replacing the optocoupler (817) and adjustable zener diode (431).
                  Attached Files

                    Comment

                    • imraneesa
                      New Member
                      • Dec 2016
                      • 6
                      • trinidad & tobago
                      #6
                      Re: Vizio E480i-B2

                      Originally posted by lotas
                      Try also replacing the optocoupler (817) and adjustable zener diode (431).
                      I changed optocoupler. I forgot to mention. But even though these two parts are bad shouldn't there be good vcc on pwm ic?

                        Comment

                        • dskall
                          Badcaps Legend
                          • Oct 2016
                          • 2905
                          • usa
                          #7
                          Re: Vizio E480i-B2

                          Can't find datasheet. I assume it gets it's initial voltage off main input. Then off of primary winding to supply run voltage. Need to check the diode and capacitor on vcc.
                          RJ would be the go-to guy on this.
                          Last edited by dskall; 01-25-2022, 07:53 PM.
                          I assume no responsibility for any stupid suggestions I might post.

                            Comment

                            • imraneesa
                              New Member
                              • Dec 2016
                              • 6
                              • trinidad & tobago
                              #8
                              Re: Vizio E480i-B2

                              Originally posted by dskall
                              Can't find datasheet. I assume it gets it's initial voltage off main input. Then off of primary winding to supply run voltage. Need to check the diode and capacitor on vcc.
                              RJ would be the go-to guy on this.
                              I hope RJ get some chance to help in troubleshooting this problem.

                                Comment

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