Vizio D50f-E1 doesn't turn on

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  • alfatv
    Badcaps Veteran
    • Sep 2020
    • 353
    • Canada
    #1

    Vizio D50f-E1 doesn't turn on

    Nothing happens visually when plugged in.
    Holding power button same result.
    Power supply generates 30V for backlight and 19V for main board.
    I found feedback resistors for 19V and figured out it's correct.
    On the main board, lots of other voltages are present: 5/3.3/1.5/1/2V
    Panel voltage is missing (assume CPU doesn't enable it) and ON signals to PS are low (close to 0V)
    CPU is warm.
    Connected ethernet cable, the router doesn't recognize TV.

    I suspect it's bricked or BGA, but would like to get some opinions.
    If someone could share service manual, it would be great.
    I did find one for E series which helped with power supply troubleshooting.

    Also, can I use main board from same series, but different screen sizes?
    Tags: None
    • alfatv
      Badcaps Veteran
      • Sep 2020
      • 353
      • Canada
      #2
      Re: Vizio D50f-E1 doesn't turn on

      Update:
      There is PS_ON 3.2V coming back from main board which enables backlight PS.
      But backlight on/off and dim inputs are all zeroes, so backlights are off.

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