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    #1

    LG 32ln5700

    Hello all! I have a currently non-working LG 32LN5700-UH LED TV that doesn't turn on (no pic, no sound), has the RED standby light, and when the POWER button's depressed, I get 3 RED light blinks, a longer one, and the cycle continually repeats.

    I tested the POWER SUPPLY voltages. All are present as they should be. I already swapped the POWER SUPPLY board but the symptoms remain.

    The MOTHER BOARD (MB) is a EAX64872105(1.0)|61991145 (aka EBR61991145). I hear a 'click' whenever the RED light changes state from the 3 blinking to single more-solid (and the PS voltages change from what they should be (12V, 24V) to near-zero...and then come back.

    I don't know what the 3 RED blinks mean (some sort of ERROR CODE?) and haven't stumbled upon an answer, either.

    I'm also having a hard time finding a replacement MB. None found for my specific model TV...BUT...there are some available for a 42LN5700!

    My question is this: Are these boards compatible? They bear the same board #, but the TV models are different. I don't know if they are and don't want to spend money without knowing more. Please advise...thanks!
    Last edited by Garion60; 01-03-2022, 12:07 PM. Reason: Added "LG" before model #
    Tags: None
    #2
    Re: LG 32ln5700

    LN series are known for backlight failures and your first suspect if you have no backlight or flash of backlights. The front LED flashes when the TV is booting and there are no error codes.

    Comment

      #3
      Re: LG 32ln5700

      So no picture, no sound or backlights?
      I assume no responsibility for any stupid suggestions I might post.

      Comment

        #4
        Re: LG 32ln5700

        None. Voltages seem ok but I'm hearing a 'click' from the MB that starts the cycle all over.

        I wanted to find out if all EAX64872105(1.0) boards are the same?

        Comment

          #5
          Re: LG 32ln5700

          Can't tell you. I'm not a board swapper.
          I assume no responsibility for any stupid suggestions I might post.

          Comment

            #6
            Re: LG 32ln5700

            Check the LED Voltage. Check it on (LED+) or LB801 (near board edge). Monitor this voltage as the tv is turned ON. Does it go higher than +70 volts then drop down?
            Last edited by R_J; 01-03-2022, 05:49 PM.

            Comment

              #7
              Re: LG 32ln5700

              No. Stays at roughly +45 volts...plug connected or not. I've got two boards, both with same +45 volts at LED+.

              Comment

                #8
                Re: LG 32ln5700

                Originally posted by Garion60 View Post
                None. Voltages seem ok but I'm hearing a 'click' from the MB that starts the cycle all over.

                I wanted to find out if all EAX64872105(1.0) boards are the same?
                is there a sticker with a number sarting with ebt-------- do these numbers match i think the eax number is the blank pcb

                Comment

                  #9
                  Re: LG 32ln5700

                  Originally posted by Garion60 View Post
                  No. Stays at roughly +45 volts...plug connected or not. I've got two boards, both with same +45 volts at LED+.
                  That would suggest there is no DRV-ON signal from the main board to turn on the led circuit.

                  Comment

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