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    #1

    Onn 100012587

    I just got a 65" Onn 100012587 and the guy thought the backlights were bad. He took it apart 😔 I looked in it and see he removed the connectors on both LED strings, so I can't really plug them back in. I looked for an image on the screen but noticed possible vertical lines. I'm thinking of putting 9v batteries in series and connecting each LED string to see if it'll light up and show me what the screen looks like. I've done this before and it worked, but that was with individual pairs of strips. If I do say 5 batteries (45v), would that at least dimly light a while string enough to see the screen?
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    #2
    I looked at replacement strips and each LED is 3v and there are 28 in each of the two strings. That comes out to 84v. If I use 6 batteries that would be 54v, at 1.92v/LED. That should be enough to light them up, correct?

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      #3
      LEDs are powered by a current of 150 - 400 mA, but how much current do your batteries produce? No matter how they burn them!

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        #4
        You should just invest in a LED tester. Can get a cheap one like 20 bucks. You seem to be doing a lot of tvs, it's one of the best tools to have because eliminate something within a minute.

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          #5
          Originally posted by lotas View Post
          LEDs are powered by a current of 150 - 400 mA, but how much current do your batteries produce? No matter how they burn them!
          Nothing negative happened when I tested individual pairs this way. However, a resistor is typically used to control the current. I just want to see the condition of the screen. I don't care about the lights at this point, because I'm expecting they are faulty anyways.

          The batteries are carbon zinc Heavy Duty from Dollar Tree, rated at roughly 400mA. I'm not concerned about current, just enough voltage to light them enough to see the screen.

          Originally posted by EazyBone View Post
          You should just invest in a LED tester. Can get a cheap one like 20 bucks. You seem to be doing a lot of tvs, it's one of the best tools to have because eliminate something within a minute.
          Can you test entire strings with those?

          Edit: nvm, I found one on Amazon and it says it goes up to 300v. I will probably pick one up in the near future, but for the time being I'll probably get the batteries.
          Last edited by x_orange90_x; 01-23-2024, 08:46 AM.

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            #6
            Yes you just shove the probe in and it lights em up. This is my most used item after my multi meter. Basically the 2 most useful tv fixing items. It's $20 don't be a cheap and buy one

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              #7
              Originally posted by EazyBone View Post
              Yes you just shove the probe in and it lights em up. This is my most used item after my multi meter. Basically the 2 most useful tv fixing items. It's $20 don't be a cheap and buy one
              I will get one soon, just not today for this tv. I have a feeling I'll be throwing it away tomorrow night anyway if the screen looks anything like I imagine it does

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                #8
                Well I tried with 6 and then 7 batteries. Didn't get so much as a blink on either string. At 64v I don't understand why they didn't light up even a little.

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                  #9
                  Because you use ghetto rig. Both can be dead though, generally in my experience one string is dead though. With these there is 2 sets so one goes out before both die. So one should work.

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                    #10
                    Originally posted by EazyBone View Post
                    Because you use ghetto rig. Both can be dead though, generally in my experience one string is dead though. With these there is 2 sets so one goes out before both die. So one should work.
                    😂

                    If money wasn't tight at the moment I'd order a tester. I will soon though.

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                      #11
                      I got a tester and tried it last night. No lights at all. Tried on an old strip I had laying around and it lit up. I'm thinking the guy ripped the connectors off so he could *gulp* attach the leds to an external power source.. And subsequently fried every one.

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                        #12
                        Has anyone ever had luck shining a bright enough LED through a back hole to light up stove of the screen? At this point I can't invest a dime in this set because I know for a fact there are thin colored vertical lines on the screen, I just can't see how close together or how far they span. If I could light up at least a small portion i think I could tell if it's a panel issue or sharing with the TCON.

                        Comment

                          #13
                          It's the panel. Toss it. Or use a very strong flashlight and shine it on the front in a dark room.

                          Glad you got a led tester though, will save you tons of time.

                          I have this flashlight and it's bright enought that you can see everything you need on the screen.

                          https://www.amazon.com/gp/aw/d/B092Z...b_b_asin_title

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                            #14
                            I discovered that the screen is cracked and that's why there are all of the colored lines, which I suspected would be the case. Backlights are fried and the screen is cracked, so I'm just pulling the boards out and tossing the rest.

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