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JVC LT-40V953 standby light flashes and stays on but no picture

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    #21
    Re: JVC LT-40V953 standby light flashes and stays on but no picture

    You have a bad led in the panel, it only takes one or two to be bad to trigger the over current circuit for the backlight circuit. The backlight tester will does not have this feature so it will supply enough voltage to supply around 20ma of current to light as many led's as it can. if one is shorted the rest will light for a short a split second (flash)

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      #22
      Re: JVC LT-40V953 standby light flashes and stays on but no picture

      Guess its a bad backlight, so you don't have to do that test.

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        #23
        Re: JVC LT-40V953 standby light flashes and stays on but no picture

        When I test it with backlight tester, The LEDs will get bright for a few seconds, then thwy will dim for a 2 seconds and then again back on lighting and this cycle goes on with backlight tester

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          #24
          Re: JVC LT-40V953 standby light flashes and stays on but no picture

          black LED wire with ground = 11.3V (leds connected)

          white wire with ground = 103V (leds connected)

          black LED wire with ground = 113.3V (leds disconnected)

          white wire with ground = 168V (leds disconnected)


          the filter capacitors when the tv switches on give me changing values. Not something stable.

          I checked also the mainboard with mainboard tester (TV160 Generation Full HD Display LVDS Turn VGA LED/LCD TV Motherboard Tester) and also got no picture

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            #25
            Re: JVC LT-40V953 standby light flashes and stays on but no picture

            Black led wire with gnd =11.3V (LEDs connected)

            White led wire with gnd = 103 V (LEDs connected)

            Black led wire with gnd =11.3V (LEDs disconnected)

            White led wire with gnd = 168 V (LEDs disconnected)

            the filter capacitors have changing values all the time

            I tested the mainboard with mainboard tester (TV160 Generation Full HD Display LVDS Turn VGA LED/LCD TV Motherboard Tester) and I get no picture

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              #26
              Re: JVC LT-40V953 standby light flashes and stays on but no picture

              My mistake, the filter capacitors have 218V

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