TCL - L50E3020FS not turning on

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  • Amraks
    Badcaps Veteran
    • Nov 2011
    • 725
    • Australia
    #41
    Re: TCL - L50E3020FS not turning on

    here are some voltages off that inverter.

    VBL 23.97v
    VBL 23.97v
    VBL 23.97v
    VBL 23.97v
    VBL 23.97v

    ERR 5.447v
    BLON 3.26v
    E_PMM 0.894V

    Measured this at the capacitors going into the positive side of the LED connectors.
    C96 23.74v
    C95 23.73v

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA
        #42
        Re: TCL - L50E3020FS not turning on

        Originally posted by Amraks
        here are some voltages off that inverter.

        VBL 23.97v
        VBL 23.97v
        VBL 23.97v
        VBL 23.97v
        VBL 23.97v

        ERR 5.447v
        BLON 3.26v
        E_PMM 0.894V

        Measured this at the capacitors going into the positive side of the LED connectors.
        C96 23.74v
        C95 23.73v
        No boosted Voltage at the moment.
        Keep the meter probes on the Plus and minus legs of C95, then turn on the TV to see how high the Voltage jumps up to before settling down to 23.74V.
        There two fuses (F1, F2) on that LED power supply, are they OK?
        The ERROR Voltage may be the clue to the problem in the backlights circuit or the LED, but I do not know if 5V is normal or <1 V is normal for the Error signal.
        Last edited by budm; 07-11-2019, 09:43 PM.
        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

          • Amraks
            Badcaps Veteran
            • Nov 2011
            • 725
            • Australia
            #43
            Re: TCL - L50E3020FS not turning on

            C95 voltage spikes to 44.0v then settles to 30.v then goes to 23.74v
            Them fuses are also fine
            Last edited by Amraks; 07-11-2019, 11:02 PM.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA
                #44
                Re: TCL - L50E3020FS not turning on

                So it looks like boost converter goes into shutdown mode. This panel has 8 LED strings so it can be that one or more is bad, You will have to check the Voltage at each one of the VLED- pin each time when you turn on the TV to see what you get on each pin, so leave the meter black probe on the chassis and red probe on VLED- one at time them turn on the TV while watching the meter to see what the Voltage jumps up to and goes down to after 5 seconds on each one of the eight VLED- pins.
                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

                  • Amraks
                    Badcaps Veteran
                    • Nov 2011
                    • 725
                    • Australia
                    #45
                    Re: TCL - L50E3020FS not turning on

                    Originally posted by budm
                    So it looks like boost converter goes into shutdown mode. This panel has 8 LED strings so it can be that one or more is bad, You will have to check the Voltage at each one of the VLED- pin each time when you turn on the TV to see what you get on each pin, so leave the meter black probe on the chassis and red probe on VLED- one at time them turn on the TV while watching the meter to see what the Voltage jumps up to and goes down to after 5 seconds on each one of the eight VLED- pins.
                    Sorry what kinda results am I looking for 0.800v spiking to 13v?

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA
                        #46
                        Re: TCL - L50E3020FS not turning on

                        Originally posted by Amraks
                        Sorry what kinda results am I looking for 0.800v spiking to 13v?
                        Looking for the result of each LED string readings.
                        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

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