Vizio M501i-B1 - Tries to turn on over and over but can't.

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  • Cam.anderson22
    New Member
    • Oct 2017
    • 4
    • United States
    #1

    Vizio M501i-B1 - Tries to turn on over and over but can't.

    So I've done quite a bit of research on vizio's not having power or not turning on. I haven't found anyone with my specific problem yet. It tries to turn on over and over again, but it never fully boots up. The white led on the bezel comes on and then dims out, and the red/blue led comes on on the main board. This repeats every 45 seconds or so. It finally came on in the middle of the night after about a week of this cycle, but now I can't get it back on again. None of the caps seem bulged either.

    Power supply Model 715G6100-P04-003-002H.
    Main Board Model: 715G6815-M02-000-005N.

    I've metered the voltages coming out of the power supply, and I get what should be expected.
    19.74v on hot rails
    5v good
    12v good
    24v is 19.74v
    PSON is 3v
    Dim is 3v
    On/Off is 0.06v when trying to turn on, 0v on standby
    Large caps at bottom of board are at 393v

    Question is, which board should I replace? Does this sound like a main board or a PSU problem?

    Thanks in advance!

    Pic of the back of the tv
    https://drive.google.com/open?id=1r9...KlVODJIg1GNjRA

    Last edited by Cam.anderson22; 10-27-2017, 09:49 PM. Reason: trying to link image
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Vizio M501i-B1 - Tries to turn on over and over but can't.

      The main board is not sending the BL-ON (ON/OFF) to turn the backlights.
      Are you sure that getting 19.74V instead of 24V?
      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

        • Cam.anderson22
          New Member
          • Oct 2017
          • 4
          • United States
          #3
          Originally posted by budm
          The main board is not sending the BL-ON (ON/OFF) to turn the backlights.
          Are you sure that getting 19.74V instead of 24V?
          Yes, 19.74v going to MB and LED driver board.

            Comment

            • Cam.anderson22
              New Member
              • Oct 2017
              • 4
              • United States
              #4
              Re: Vizio M501i-B1 - Tries to turn on over and over but can't.

              Any ideas? There's a multi wire going from the MB to the led driver board, and only one pin has voltage on it (12v). All the other pins are zero.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Vizio M501i-B1 - Tries to turn on over and over but can't.

                  "On/Off is 0.06v when trying to turn on, 0v on standby"
                  Right now the main board is not sending the ON Voltage to turn on the backlights circuit.
                  You may be able to simulate the ON/OFF signal by using the 1000 Ohms resistor between the STBY 5V and the ON/OFF pin, BUT YOU MUST DISCONNECT this wire going back to the main board first.
                  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

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