Toshiba 40L310U Led issue

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  • dvd4me
    Member
    • May 2017
    • 20
    • Canada

    #1

    Toshiba 40L310U Led issue

    Hello,

    I have this TV with the burned leds. I ordered the led strip from Ali and install-it. This is hard as there are a TON of screws to put back.
    If you look at the leds they are just burned down, despite of the large aluminum heatsink.
    The issue is that too much current is put into the leds, even if it's PWM-ed, it always peaks at 230mA.
    So I check under that heatsink to see the Led driver, it's some obscure chip, OZ9998HDN that has no datasheet on the manufacturer website ( O2something).
    They have a brochure that has a WRONG and very blurry picture for this part number, it does not correspond to the LED outputs on the Toshiba PCB.
    I looked at another chip from this manufacturer and found that 4 output configuration, sort of blurry picture.
    There is a pin called Iset that has a resistor to ground, 5.3k on my PCB.
    I soldered a 1.1 ohm resistor on a led path to test the current. As in the mini oscilloscope picture, it's 230mA. (250mV/1.1ohm = 230mA)
    I put then a 10K potentiometer to measure and at around 6.8k current drops below 200mA.
    Done, replace the pot with a fixed SMD 6.8k resistor and remove the 1.1ohm one. Now the Leds should run less stressed and last longer.
    Imagine they say Leds are generally 10.000hours life rating but they die out burned.
    Just changing the LED would not really fix the problem as even at low backlight settings they still get 230 mA thru and it's probably more than they were designed.
    Cheers
    Attached Files
  • pshovest
    New Member
    • Jun 2021
    • 2
    • USA

    #2
    VERY helpful post. Thanks for taking the time to provide all the details.
    I'm attempting to repair an orphaned Toshiba 40L310U TV. It appears that 3 of the 4(?) LED strips are burned out.
    All of the replacement strips (V400HJ6-ME2-TREM1) I find have 52 bare LED's, yet all Youtube video's for similar size Toshiba's show 9-12 LED's with a round clear plastic lense. Do you recall what the replacement strip you used looked line?
    Thanks!

    Comment

    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8032
      • Canada

      #3
      That’s some 4 year old thread…
      Last edited by CapLeaker; 05-04-2025, 10:47 AM.

      Comment

      • pshovest
        New Member
        • Jun 2021
        • 2
        • USA

        #4
        Originally posted by CapLeaker
        .....That’s some 4 year old thread…
        Good things get better with age......LOL.
        Looking closer at the top of the first photo in the OP, I can see the single LED strip.
        Bad news is I didn't recognize that this is an edge lit display. It's too thin to be backlit. Good news is I only need (1) 52 LED strip/backlight.




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