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Toshiba 55LF621U19 vgh avvd problem

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    Toshiba 55LF621U19 vgh avvd problem

    Looking for advice concerning no picture. has back lights and sound. i have vgl -7.89. vgh low at 11.85 and no avvd voltage found, i have few other voltages marked in the pictures. Can anyone tell me which test point is avvd.

    All voltages i found are marked in the pictures. No caps were shorted, so maybe someone can point me in the right direction to help narrow the issue down
    Attached Files

    #2
    Re: Toshiba 55LF621U19 vgh avvd problem

    Did you try disconnecting right side?
    I assume no responsibility for any stupid suggestions I might post.

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      #3
      Re: Toshiba 55LF621U19 vgh avvd problem

      yes. i also tried the tape method on each one

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        #4
        Re: Toshiba 55LF621U19 vgh avvd problem

        If no shorts you may have a bad dc to dc IC.
        I assume no responsibility for any stupid suggestions I might post.

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          #5
          Re: Toshiba 55LF621U19 vgh avvd problem

          alright thanks. do you know any good web site i can order tv board smds. one more question. can you verifiy which test point in the photos is suppose to be the AVVD test point.

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            #6
            Re: Toshiba 55LF621U19 vgh avvd problem

            Your vgh looks like vin, not vgh. There are no standard terminology for this.
            I assume no responsibility for any stupid suggestions I might post.

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              #7
              Re: Toshiba 55LF621U19 vgh avvd problem

              alright. il try changing the dc to dc and see what happens.

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                #8
                Re: Toshiba 55LF621U19 vgh avvd problem

                May not be bad voltages. I would check data lines first and see if you have any voltage on them.
                I assume no responsibility for any stupid suggestions I might post.

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                  #9
                  Re: Toshiba 55LF621U19 vgh avvd problem

                  ok. i will check those out today

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