Vizio E370VA wont turn on

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  • nbnb
    Member
    • Nov 2019
    • 13
    • usa

    #1

    Vizio E370VA wont turn on

    I have a Vizio E370VA that won't turn on. It was working fine until I didn't use it for several weeks. When I press the power button, the Vizio logo below the screen gets bright for about 1 second and then dims. The screen remains blank and the Vizio screen logo never displays.

    I have tried unplugging the set, holding the power button for 30 seconds, and then powering it up. That didn't help.

    I pulled the back off and measured 3.66 volts on the standby port labeled 5V. I disconnected the main board from the power board and then the 5V port read 5.25 volts. Does this indicate that the power board is bad? Or, does this indicate that the power board is operating correctly and that the main board may be bad?

    Any ideas on how to fix this?
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9516
    • Canada

    #2
    Re: Vizio E370VA wont turn on

    Did the standby voltage change when you turned the tv ON? Also check if you have the PS_ON voltage when the power buttonis pressed. The +5v could be low (3.6v) in standby but would increase when the PS_ON is high. If the voltage stays low, check C952, C954, C958 and C960

    Comment

    • nbnb
      Member
      • Nov 2019
      • 13
      • usa

      #3
      Re: Vizio E370VA wont turn on

      Thanks for your reply. PS_ON voltage is 3.60 volts when the TV is off. When I turned the TV on, PS_ON voltage went to 0 volts and the standby voltage went to 5.16 volts. Also, the 24 volt pins measure 24.6 when off and 0 volts when the tv is on. The 12 volt pins measure 12 volts when off and 0 volts when on.

      Is the PS_ON voltage supposed to go to 0? What else can I check to narrow down the problem?

      Originally posted by R_J
      Did the standby voltage change when you turned the tv ON? Also check if you have the PS_ON voltage when the power buttonis pressed. The +5v could be low (3.6v) in standby but would increase when the PS_ON is high. If the voltage stays low, check C952, C954, C958 and C960

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9516
        • Canada

        #4
        Re: Vizio E370VA wont turn on

        I think you have the voltages backwards, When the tv is ON The PS-ON voltage will high (3.6v) . When the TV is OFF the +12 & +24v will be 0. When they are at +12 & +24V the tv is ON.
        Post some pictures of the complete rear of the tv so we can see what we are dealing with. You may have a backlight issue. Try shining a flashlight at the screen and press the menu button to see if you can see anything on the screen. You could also try connecting a HDMI source and see if the tv goues to that input and gives you sound etc.
        Last edited by R_J; 11-06-2019, 06:12 PM.

        Comment

        • nbnb
          Member
          • Nov 2019
          • 13
          • usa

          #5
          Re: Vizio E370VA wont turn on

          I plugged it in (so the TV should be off) and get the following voltages:

          3.60 (5v)
          3.60 (ps/on)
          24.6 (24v)
          12 (12v)

          When plugged in, the vizio bezel logo glows dimly.

          Pressing the power button, the bezel logo gets bright for about a second before dimming. I get the following voltages:

          5.16 (5V)
          0 (ps/on)
          0 (24V)
          0 (12V).

          If I press the power button again, the bezel logo darkens and then returns to a dim state.

          I don't see anything when using a flashlight to illuminate the screen. I don't get any sound. I never see the screen startup logo. It's as if the TV is not turning on.

          Several pictures are attached.

          Originally posted by R_J
          I think you have the voltages backwards, When the tv is ON The PS-ON voltage will high (3.6v) . When the TV is OFF the +12 & +24v will be 0. When they are at +12 & +24V the tv is ON.
          Post some pictures of the complete rear of the tv so we can see what we are dealing with. You may have a backlight issue. Try shining a flashlight at the screen and press the menu button to see if you can see anything on the screen. You could also try connecting a HDMI source and see if the tv goues to that input and gives you sound etc.
          Attached Files
          Last edited by nbnb; 11-06-2019, 06:52 PM.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Vizio E370VA wont turn on

            "3.60 (5v)
            0 (ps/on) This cannot be 0V and still having switched 12V and 24v to be on.
            24.6 (24v)
            12 (12v)"
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • nbnb
              Member
              • Nov 2019
              • 13
              • usa

              #7
              Re: Vizio E370VA wont turn on

              Thanks, and sorry. You are right. I had the correct voltage in post #3 for when the TV is off. I edited my post to note that it is 3.6 volts.

              Originally posted by budm
              "3.60 (5v)
              0 (ps/on) This cannot be 0V and still having switched 12V and 24v to be on.
              24.6 (24v)
              12 (12v)"

              Comment

              • R_J
                Badcaps Legend
                • Jun 2012
                • 9516
                • Canada

                #8
                Re: Vizio E370VA wont turn on

                If you look at the inverter board (small board on the right in pic#1) , there is a small led (LED1)that should light for a few seconds then fade out when the tv is first turned on. If this does not happen, When there is +24 volts at the inverter, check the voltage on both sies of the fuse (F1) and also check the voltages on pins 14,13 & 12.
                Pin 12 is the inverter on/off
                Last edited by R_J; 11-06-2019, 08:39 PM.

                Comment

                • nbnb
                  Member
                  • Nov 2019
                  • 13
                  • usa

                  #9
                  Re: Vizio E370VA wont turn on

                  The LED1 does not light up at all. When I have 24.6 volts on PIN 1 of the inverter, the F1 fuse measured 24.7 volts on both sides of the fuse. Pin 14 was 0.28V, pin 13 was 2.46V, pin 12 was 0.09V, and pin 11 was 0.10V.

                  I attached some pictures of the inverter board with the cover off.


                  Originally posted by R_J
                  If you look at the inverter board (small board on the right in pic#1) , there is a small led (LED1)that should light for a few seconds then fade out when the tv is first turned on. If this does not happen, When there is +24 volts at the inverter, check the voltage on both sies of the fuse (F1) and also check the voltages on pins 14,13 & 12.
                  Pin 12 is the inverter on/off
                  Attached Files

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Vizio E370VA wont turn on

                    https://www.badcaps.net/forum/attach...0&d=1573102972
                    pin 13 (Dimmer control) was 2.46V,
                    pin 12 (BL-ON) was 0.09V

                    You do not have BL-ON to turn on backlights circuits.
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • nbnb
                      Member
                      • Nov 2019
                      • 13
                      • usa

                      #11
                      Re: Vizio E370VA wont turn on

                      Does that mean the inverter board is bad and should be replaced?

                      Originally posted by budm
                      https://www.badcaps.net/forum/attach...0&d=1573102972
                      pin 13 (Dimmer control) was 2.46V,
                      pin 12 (BL-ON) was 0.09V

                      You do not have BL-ON to turn on backlights circuits.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Vizio E370VA wont turn on

                        PS-ON, BL-ON, DIM signals are from the main board.
                        You can try forcing on the inverter board by disconnecting the BL-ON wire from the inverter board connector then use 1K resistor between the BL-ON pin of the Inverter board and the Standby 5V pin to force on the inverter board.
                        You should read Basic LCD TV and monitor troubleshooting guide.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Vizio E370VA wont turn on

                          BTW, I do not know which main board you have, but shopjiimy is EEPROM for this TV model, see the description of what the EEPROM will fix.
                          https://www.shopjimmy.com/catalogsea...q=Vizio+E370VA
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment

                          • nbnb
                            Member
                            • Nov 2019
                            • 13
                            • usa

                            #14
                            Re: Vizio E370VA wont turn on

                            Thanks for your reply.

                            Comment

                            • R_J
                              Badcaps Legend
                              • Jun 2012
                              • 9516
                              • Canada

                              #15
                              Re: Vizio E370VA wont turn on

                              If ypou want to check the power supply and inverter/backlights. disconnect the cable from the power supply going to the main board. Then connect about a 1K resistor between the +5V (pin 12 or 11) and pin1 (ON/OFF) then place another 1K resistor between +5V and pin10 (or you can short between pins 10&11) Then plug in the tv. this should turn on the power supply and the backlight (there will not be a picture)
                              You may also need a third 1K resistor between +5 and pin2 (DIM) if the backlights don't turn on
                              Attached Files

                              Comment

                              • nbnb
                                Member
                                • Nov 2019
                                • 13
                                • usa

                                #16
                                Re: Vizio E370VA wont turn on

                                If I do this, and the backlight turns on, does it indicate that the power supply and inverter/backlights are good and that the problem is with the main board? Or, could the problem still be with the power supply?

                                Originally posted by R_J
                                If ypou want to check the power supply and inverter/backlights. disconnect the cable from the power supply going to the main board. Then connect about a 1K resistor between the +5V (pin 12 or 11) and pin1 (ON/OFF) then place another 1K resistor between +5V and pin10 (or you can short between pins 10&11) Then plug in the tv. this should turn on the power supply and the backlight (there will not be a picture)
                                You may also need a third 1K resistor between +5 and pin2 (DIM) if the backlights don't turn on

                                Comment

                                • R_J
                                  Badcaps Legend
                                  • Jun 2012
                                  • 9516
                                  • Canada

                                  #17
                                  Re: Vizio E370VA wont turn on

                                  Yes, that test would turn on the power supply, the inverter and the backlights. That would indicate the main board is at fault and could point to a corrupt eeprom.
                                  If you have a can of freeze spray or an inverted can of canned air, you can try this to see if the eeprom may or may not be the issue:
                                  Unplug the tv, freeze the eeprom ic, wait 10~15 seconds, plug in the tv and see if turns on.
                                  If this test does work the fault is with the eeprom ic and the rest of the main board is likely ok. If this does'nt work you could still have a faulty eeprom
                                  Being a Vizio and this model I would highly suspect a corrupt eeprom ic
                                  Last edited by R_J; 11-08-2019, 10:50 AM.

                                  Comment

                                  • nbnb
                                    Member
                                    • Nov 2019
                                    • 13
                                    • usa

                                    #18
                                    Re: Vizio E370VA wont turn on

                                    Thank you.

                                    Comment

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