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Onn onc18tv001 with one bad led

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    #1

    Onn onc18tv001 with one bad led

    I've had this ONN ONC18TV001 for about 5 years. My wife left it on 24/7 as a night light so not too surprised it broke where the screen was still displaying the picture just there was no Backlight. The power/mainboard had voltage for the back lights but when you turn it on it starts high over 100v then within less then a second would go down to 30 something volts if I remeber correct. I figured I should check for a bad LED since that's certainly a common failure on these. I did find one LED that I doesn't light up using the diode setting on my multimeter. There is one other thread about this TV https://www.badcaps.net/forum/troubl...de-for-walmart where they thought their Backlight ic may be the issue but they never reported back any solution.

    I'm reluctant to try to unstick the led strip cause it seems really well glued down, so how fragile are these? I will probably use hot air to loosen it unless yall tell me otherwise. Can I replace the led with a similar one from. Another broken set or does it need to be identical. Can I just rewire skipping the bad strip or throw another strip in from another TV. (I'm assuming not unless the strip or leds have same resistance.)

    What are my options to proceed other then buying a used strip? I'm worried if I just replace one the other two will have failures soon as well.
    Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.
    Tags: None
    #2
    This video covers the choices, easiest being the solder bridge method, that result may be a darker spot where the led is missing. I did it on a 32 inch funai and there is no dark spot at all, the funai however had the leds closer together so that may be the difference, I would not do it for more than one led though. Turning down the backlights will help the leds live a lot longer, if no backlight adjustment, turning down brightness can help tvs last longer also because they are just not working as hard with the lower settings: https://www.youtube.com/watch?v=Fz-G33xJLmk

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      #3
      Edit, sometimes I don't read. Do as Sony says

      Or the best

      Just buy all new strips. Best option.
      They are probably cheap on AliExpress
      Last edited by EazyBone; 08-26-2024, 07:56 AM.

      Comment

        #4
        If you have a good DMM there is a slight difference between a good LED and a bad one. Sometimes LED's can still show good on the DMM, but yet be bad. The only thing you can do as nomoresonys mentioned, turn the backlights down to 50% and see if the backlight stays on. This way you can get a little more life out of he LED's, but the bad one will fail eventually.

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          #5
          Your backlight number ZX43ZC332M08A1

          https://www.tvpartsguy.com/onn-onc18...x43zc332m08a1/

          https://aliexpress.com/item/1005004353956365.html

          Comment

            #6
            I ended up testing with my multimeter in diode mode and all but one lit up, I did the solder bridge method ( without removing the strips) to skip that led and it worked for another 3 months. Came back her and saw the Ali express link and have ordered a new set from there for $10 so great advice all around so far.

            I even got a replacement for the original remote at same time for $1 since I was a new user. I'm not sure what failed on the original remote since it still lights up when buttons are pressed. There's a lot of aftermarket ones for sale on Amazon and ebay so clearly its a common failure. I also couldn't get a universal remote or Amazon fire remote to program for it, yet the remote on this model is quite useful cause it passes through (hdmi cec) it's commands to the firestick so can control it, it is roughly the same size as firestick and roku remotes and is limited to just a useful minimum of buttons.

            Any advice on removing the old strips and or affixing the new ones? Is hot air the best bet for removal? And will the glue remain useable enough to reuse, or will the new strips possibly come with adhesive strips?

            Thanks
            Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

            Comment

              #7
              Yes sometimes it comes with adhesive. I doubt at $10 it will but maybe. Hot air isn't needed just flathead screwdriver to pop off the glue or whatever on a end and start ripping them off, just don't obviously pull a wire.

              I use a double sided black tape. Strong works well. 8mm-10mm generally. Also from AliExpress

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                #8
                I got them off by prying, wasn't too bad. But they were held on by a few spots of something thay looks more like a thermal adhesive, not merely glue. Is it really a thermal adhesive!? If so should I replace with something like arctic alumina, or use any old cheap thermal grease like ceramique Inbetween the areas I use a cheaper adhesive? Not that I have an adhesive in mind maybe super glue or liquid nails?
                Last edited by cashkennedy; 04-18-2025, 10:21 PM.
                Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

                Comment

                  #9
                  Is this similar to your black tape or to what anyone else is using? https://a.co/d/83uz66f

                  Would a glue like https://a.co/d/eFj1aT3 work other then the risk of needing to replace the new strips if they don't last as long as the originals?
                  Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

                  Comment

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