HIsense Back lights

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  • provider10
    Senior Member
    • Mar 2016
    • 52
    • South Africa
    #1

    HIsense Back lights

    HI
    I got 2 hisense LEDN40K20dp tvs with most of the backlight LEDs blown.
    In total there are 40 LEDs inseries which need s approx 120 volts. From the PSU I am getting a constant 240volts, so i suspect this is the problem. Hisense says this is an obsolete set so no spares. Anyone been here before
    Regards
    Jim
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: HIsense Back lights

      If the LED driver is not seeing the load (LED string not connected or open circuit in the LED string), the output Voltage will be higher than the loaded Voltage.
      Do you have good clear pictures of the power supply board and the pictures of the whole backside of the TV showing all the boards?
      Last edited by budm; 08-02-2019, 09:39 AM.
      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

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