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Vizio M65-C1 No Picture, Backlight or Sound, External LED Working

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    Vizio M65-C1 No Picture, Backlight or Sound, External LED Working

    Hi All From Texas,

    I have searched the forums and believe I have a bad mainboard after testing my power supply and coming across this thread where the OP had low On/Off voltage on Pin 15 (+0.149V~+0.157V) of CN9101/02.

    https://www.badcaps.net/forum/showthread.php?t=80093


    If someone does not mind looking over my results and reassuring me that this is indeed the case and the mainboard is bad, it would be much appreciated!!


    CN9101/CN9102
    'Standby' and 'On' Columns = All Cables Plugged In

    *While the PCB key states 12V for CN9101/02, it is wrong and should be +19V, which is reflected below.

    Pin #/PCB Key/ STANDBY/ ON (Under Load)
    1___+5V/+3.5V___+5.11V___+5.11V
    2___+5V/+3.5V___+5.11V___+5.11V
    3___+19V_______+19.07V__+19.05V
    4___+19V_______+19.07V__+19.05V

    5___+19V_______+19.07V__+19.05V
    6___+19V_______+19.07V__+19.05V
    7___+19V_A_____+19.07V__+19.06V
    8___+19V_A_____+19.06V__+19.07V

    9___GND__________0.00V____0.00V
    10__GND__________0.00V____0.00V
    11__GND__________0.00V____0.00V
    12__GND__________0.00V____0.00V

    13___3D __________0.00V____0.00V
    14___PS_ON______+0.081V__+3.653V
    15___ON/OFF_____+0.015V__+0.134V
    16___DIM________+0.009V__+3.290V

    CN9201/CN9203

    'NC' = Not Connected By Manufacturer

    Pin #/PCB Key/ STANDBY/ ON (Under Load)
    1___ON/OFF______NC_________NC
    2____DIM_________NC_________NC
    3____3D__________NC_________NC
    4___+12V_________NC_________NC

    5____GND________0.00V____0.00V
    6____GND________0.00V____0.00V
    7____GND________0.00V____0.00V
    8____GND________0.00V____0.00V

    9____GND_________NC________NC
    10___GND_________NC________NC
    11___+24V______+0.011V__+24.06V
    12___+24V______+0.010V__+24.06V

    13___+24V______+0.011V__+24.06V
    14___+24V______+0.010V__+24.06V

    The 3 PSU Main Filter Caps +385V Under Load / No bulging caps that I could see.

    Some other things of note that I came across in other threads asking questions.

    There is a visible LED light on the mainboard. Mine Is red when plugged in under standby, and 1/2 red 1/2 purple when on. When the tv is turned back off, LED is red only. Must be two LEDS actually.

    Symptoms when the TV failed were vertical cascading lines of different colors, then no sound, backlight, video. The external white LED comes on and blinks as normal, then repeats this every few minutes.

    SN Rear Outside Cover LTMASNAR1550041
    Mainboard Model # 715G7228-M01-000-005K

    I was thinking of just sending this in to Nicks Tvs in Arizona for a repair. Anyone have experience with their service?

    Thank You guys!
    Attached Files
    Last edited by Cajun Caps; 11-21-2019, 04:32 PM.

    #2
    Re: Vizio M65-C1 No Picture, Backlight or Sound, External LED Working

    ON/OFF is the backlight on signal and not going high. Bad main board.

    Comment


      #3
      Re: Vizio M65-C1 No Picture, Backlight or Sound, External LED Working

      The power supply is ok. the backlight ON/OFF and DIM are not used on the power supply, The main board drives the led driver board. You could have a main board, T-Con or even the panel itself.

      Did anyone clean the screen with a liquid cleaner before the problem?
      Last edited by R_J; 11-21-2019, 05:20 PM.

      Comment


        #4
        Re: Vizio M65-C1 No Picture, Backlight or Sound, External LED Working

        Originally posted by R_J View Post
        The power supply is ok. the backlight ON/OFF and DIM are not used on the power supply, The main board drives the led driver board. You could have a main board, T-Con or even the panel itself.

        Did anyone clean the screen with a liquid cleaner before the problem?
        Nah. No liquid cleaner was used. In fact, I am not sure if it had ever been dusted either. Good thing my cleanliness is not directly related to this item

        If there is some further test I can do, I am open to suggestions.

        Comment


          #5
          Re: Vizio M65-C1 No Picture, Backlight or Sound, External LED Working

          Originally posted by Cajun Caps View Post
          Nah. No liquid cleaner was used. In fact, I am not sure if it had ever been dusted either. Good thing my cleanliness is not directly related to this item

          If there is some further test I can do, I am open to suggestions.
          Edit:
          Actually it looks as though we have our connections crossed. CN9201/CN9203 ON/OFF and DIM is not used by the PSU, but it is used in CN9101/CN9102 which ends up going to the mainboard. Being late last night, I overlooked that.

          Comment

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