Element ELCHW402 - Screen Does Not Turn On

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA
    #21
    Re: Element ELCHW402 - Screen Does Not Turn On

    They are normal, but how about the 24V at the connector that goes to the inverter board?
    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

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6643
        • Wales
        #22
        Re: Element ELCHW402 - Screen Does Not Turn On

        Originally posted by jjl4999
        I purchased two like kind replacement capacitors and recorded the following results:
        C812 measured 4.48 uF out of circuit.
        C811 measured 4.75 uF out of circuit.
        Both new capacitors measured 11 uF out of circuit.

        I installed the new capacitors at C811 and C812 and first plugged the 1K resistor connecting Standby and 5Vs. I was able to measure around 13V on N811 pin 12 and around 10 V on N811 pin 12, all referenced to negative of C810. Voltages were in the acceptable range listed in Dick's document. I then connected all of the boards to the main power board, pressed the TV Power button, and recorded the following results at the cold side connector when referenced to the chassis:
        STB: 2.16 V
        5V_S (#1): 4.94 V
        5V_S (#2): 4.94 V
        12V (#1): 11.99 V
        12V (#2): 11.99 V
        BR1: 2.84 V
        5V_M (#1): 5.27 V
        5V_M (#2): 5.27 V
        SW: 3.02

        These values seemed normal so I picked up the TV and saw the blue screen with no signal message. I connected an antennae and have the TV powered on and working for the past few hours.

        Thanks to everyone for the knowledge and information. I enjoyed the whole process. My first successful electronics repair.

        I have to admit that I would not have guessed changing out C811 and C812 would have solved the issue. Any tips on how to become better at troubleshooting power boards and following schematics?

        Stay an active member of the forum and follow how other faults are tackled.
        Willing to help but I'm no expert.

          Comment

          • jjl4999
            Member
            • Mar 2017
            • 21
            • USA
            #23
            Re: Element ELCHW402 - Screen Does Not Turn On

            Originally posted by budm
            They are normal, but how about the 24V at the connector that goes to the inverter board?
            I measured 24.7 volts out to the inverter board across all terminals labeled 24V on the connector.

              Comment

              • jjl4999
                Member
                • Mar 2017
                • 21
                • USA
                #24
                Re: Element ELCHW402 - Screen Does Not Turn On

                Originally posted by dick_barton
                Stay an active member of the forum and follow how other faults are tackled.
                Will do Dick.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA
                    #25
                    Re: Element ELCHW402 - Screen Does Not Turn On

                    Glad it is working.
                    Last edited by budm; 07-22-2017, 02:47 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

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