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RCA LED55C55R120Q no backlights

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    #1

    RCA LED55C55R120Q no backlights

    I have an RCA LED55C55R120Q that I picked up from my local recycling center. It was in the original box and is in really good condition. It turns on with no backlights. This is what I have tested so far:

    I can see an image on screen with a flashlight.

    I get 3.3 at bl_on and adj pin and it stays steady.

    At LED + pins I get 132v when I turn the TV on but that quickly drops, eventually reaching less than a volt.

    I am guessing I probably have bad LED's but wanted to be sure.
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    #2
    Re: RCA LED55C55R120Q no backlights

    I think i need to move to the states , all people bring their broken tv's to the recycling center/dump haha.

    It probably has a bad led that pulls the voltage down. Tv turns on so good chance that the psu is good.
    I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

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      #3
      Re: RCA LED55C55R120Q no backlights

      Yes, it is a bad LED or two. IIRC, the white background in the LED "chamber" is stuck down with double-sided tape. Use a hairdryer to soften the glue while you remove it to get to the strips.

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        #4
        Re: RCA LED55C55R120Q no backlights

        Thanks for the confirmation on the LEDs.

        Moreno83 - You wouldn't believe what I find at my electronics recycling center. I picked up a 50" Toshiba Smart TV a few weeks ago that just had a bad cap. Popped in a new one and it has worked perfectly since.

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          #5
          Re: RCA LED55C55R120Q no backlights

          i wish we had electronics recycling center s in the uk i could get some project sets to work on then do you have to pay the recyclying centers in the us

          Comment

            #6
            Re: RCA LED55C55R120Q no backlights

            Originally posted by SHADOW3277 View Post
            Thanks for the confirmation on the LEDs.

            Moreno83 - You wouldn't believe what I find at my electronics recycling center. I picked up a 50" Toshiba Smart TV a few weeks ago that just had a bad cap. Popped in a new one and it has worked perfectly since.
            Do you have to pay for the TVs?
            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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              #7
              Re: RCA LED55C55R120Q no backlights

              I've looked for electronics recycling places near me and I can't find any.

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                #8
                Re: RCA LED55C55R120Q no backlights

                I usually pay around $5 per tv. If I have to take the tv back, say its too expensive to fix or cant get the part, ill strip the good parts and then pay another $5 to drop the tv back off.

                Comment

                  #9
                  Re: RCA LED55C55R120Q no backlights

                  Do these places have a name? I've tried to google electronic recycling centers but not really finding anything.

                  Comment

                    #10
                    Re: RCA LED55C55R120Q no backlights

                    I have several recycling centers in my area, most didnt take electronics. I found one that did and just asked the guy in charge if if I could buy stuff from them.

                    Comment

                      #11
                      Re: RCA LED55C55R120Q no backlights

                      I go to a transfer station,and have found quite a few...actually just brought home a 46'' sanyo led today...busted screen of course but be good for experience...Maybe harvest the led's for a project

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