Hisense HL55K310PZL3D no backlight issue

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  • syaoran123
    Senior Member
    • Jun 2014
    • 178
    • Australia
    #1

    Hisense HL55K310PZL3D no backlight issue

    Have a Hisense 55 inch TV which i got from someone else. No backlight. There is sound and you can see images when shining a flashlight on the screen. It was on the highest brightness setting when I got it, and have now tuned it back.

    I thought maybe start by examining the LED backlight. Already spent few hours dismantling it to gain access to the edge lit LED's. Tested each LED individually with DMM and they all light up when I tested them in diode mode. So appears to be normal.

    To the power supply...part number is RSAG7.820.4763 or HLE-4046WH. The connectors XP805 and XP806 are the supplies to the backlight. While the power supply is disconnected from the mainboard, I am getting no voltage from all these pins. Even when mainboard connected, same thing. Can someone tell me what voltages are Vout, Tn and In supposed to be during normal operation?

    I am getting normal reading for 16V and 12V supply though.
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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Hisense HL55K310PZL3D no backlight issue

      https://www.badcaps.net/forum/attach...3&d=1483247148
      Report the DCV readings of each pin of the connector XP902 when TV is turned on.
      Pin 4 SW = BL-ON
      Pin 3 PWM = PWM Dimming control
      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

        • syaoran123
          Senior Member
          • Jun 2014
          • 178
          • Australia
          #3
          Re: Hisense HL55K310PZL3D no backlight issue

          Thanks for your reply

          SW= 2.01V
          PWM= 1.88V

            Comment

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