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Proscan PLD3283D has Standby but Won't Turn On

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    Proscan PLD3283D has Standby but Won't Turn On

    I've been testing the mainboard which is the only board on the tv and haven't found any issues as to why this tv won't turn on. It has standby power and I can't figure out how to manually turn it on by jumpering as I don't know what pin it is. I've tested the diodes, a few caps and regulators and didn't see any issues. Here are pics and voltages on pins.


    GND - 0
    K7/N - 0
    K6/P - 3.3
    K5/M - 3.3
    K4/V- - 3.3
    K3/V+ - 3.3
    K2/C - 3.3
    K1/C+ - 3.3
    K0/S - 3.3
    GND - 0
    IR - 4.78
    GRN - 0
    RED - 2.75
    5V - 5
    Attached Files

    #2
    Re: Proscan PLD3283D has Standby but Won't Turn On

    I see about 4 LDO regulator ICs, UL1, 41, 51, and UT1 (this one may not be IC, not sure) which you should test the Voltages on all 3 pins.
    Read the link below on how to test and report the readings in the FORMAT we can easily understand.
    Last edited by budm; 04-06-2015, 10:17 AM.
    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


      #3
      Re: Proscan PLD3283D has Standby but Won't Turn On

      Thanks, I checked them for short but haven't check for voltage. Will do tonight and report back. Thanks

      Comment


        #4
        Re: Proscan PLD3283D has Standby but Won't Turn On

        OK here we go:

        UL41:
        pin1 - 1.25
        pin2 - 2.50
        pin3 - 5

        UT1:
        pin1 - 0
        pin2 - 3.3
        pin3 - 5

        UL1:
        pin1 - 0
        pin2 - 3.3
        pin3 - 5

        UL51:
        pin1 - .5
        pin2 - 1.8
        pin3 - 4.3

        Not sure if this shows any signs of defective part but do you know how to manually power on this thing? I didn't recognize the power on pin on the board

        Thanks

        Comment


          #5
          Re: Proscan PLD3283D has Standby but Won't Turn On

          also when I press the power button on tv this is voltage changes on pins

          K6/P - 0
          K5/M - 1.4

          Comment


            #6
            Re: Proscan PLD3283D has Standby but Won't Turn On

            anyone know what UL51 is, it's marked at 1117B AD B72V I can't find datasheet on it.

            Comment


              #7
              Re: Proscan PLD3283D has Standby but Won't Turn On

              Originally posted by barkster View Post
              anyone know what UL51 is, it's marked at 1117B AD B72V I can't find datasheet on it.
              It's an adjustable voltage regulator. Just Google "1117 voltage regulator" for datasheet.

              Comment


                #8
                Re: Proscan PLD3283D has Standby but Won't Turn On

                https://www.badcaps.net/forum/showpo...99&postcount=8
                https://www.badcaps.net/forum/showth...999#post300999

                The readings on post 4 are fine.
                UL51 is an adjustable reg, pin 1 of 0.50V + Vref of 1.25V = Vout of 1.75V (+/- 3%)
                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


                  #9
                  Re: Proscan PLD3283D has Standby but Won't Turn On

                  yeah I found the datasheet for others but the AD B72V I couldn't find and threw me off. Any other suggestions? Anyone know how to force this set on with the pin outs listed. I think the power button is working because pin K6/P goes low when I push it so I think I can rule that out but I'm willing to try anything at this point.

                  Comment

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