Toshiba 50L420U/49L310U Flash Toshoba logo then no backlight

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  • Sevenqi
    Badcaps Veteran
    • Jul 2011
    • 292
    #1

    Toshiba 50L420U/49L310U Flash Toshoba logo then no backlight

    Toshiba 50L420U/49L310U TV, press power button, it shows Toshiba Logo then backlight off.

    Tested the backlight stripes with backlight tester, all 3 sections seem to be good.

    The problem is the power supply PK101W1100I , 2 backlight feedback resistors open in my case, the value mark 101, they are both 100 Ohm.
    I replaced the 2 resistors with same value fixed the problem.
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    • alfatv
      Badcaps Veteran
      • Sep 2020
      • 353
      • Canada
      #2
      Re: Toshiba 50L420U/49L310U Flash Toshoba logo then no backlight

      It was just one bad LED in my case, kinda shorted, but with slightly higher voltage drop than normal.
      Checked resistors too, they were OK, thanks for the tip.

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