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RCA led42c45rq no picture, unable to turn off

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    RCA led42c45rq no picture, unable to turn off

    i'm trying to fix this tv for a friend of a friend, but i have never seen a problem like this before and have no idea where to start.

    The tv, according to a manual i found the red led is standby and goes out when turned on. When i plug in the tv the red light comes on and i get 13.5v (too high?) at the 12v pins and 5v at the 5v pins. the backlight connector is showing 60v and the panel does not light up. i have tried the flashlight method, but nothing on screen that i can see (no dim flash of any sort, either). I am unable to turn the tv back off as pressing the power button does nothing and has to be unplugged and plugged back in to go back to standby.

    the caps all tested good on the power supply board. (first thing i checked).
    so what i think i am looking at is a bad backlight and mainboard but that is mostly just a guess. i'm stumped. multiple seemingly unrelated problems?

    thanks for reading through and potential solutions
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    #2
    Re: RCA led42c45rq no picture, unable to turn off

    check the DC voltage of the PS-On and the BL-On pin on the PSU. I am thinking you may have a main board problem only. However if there is proper voltage on the BL-On pin, then yes, you have a backlight problem too. So check those voltages and report back.

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      #3
      Re: RCA led42c45rq no picture, unable to turn off

      looks like i missed a section of text. the above voltages are specified with the tv on (red light off).
      with the tv off (red light on) the only voltage is the 5vsb.

      with the tv on the ps-on is 4.6v and bl-on is 5v.

      Comment


        #4
        Re: RCA led42c45rq no picture, unable to turn off

        It looks like you have at least 2 problems. PSon and BLon are there, but no back lights. So there is something wrong with the wiring or most likely a bad LED that needs to be fixed first. The not being able to turn off problem is a main board problem.

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          #5
          Re: RCA led42c45rq no picture, unable to turn off

          You might have a look at this http://www.shopjimmy.com/rca-42lb45r...eprom-only.htm - TV turns on but there is no backlight (LED indicator shows TV is on but there is no image
          I assume no responsibility for any stupid suggestions I might post.

          Comment


            #6
            Re: RCA led42c45rq no picture, unable to turn off

            looks like a lot of backlight issues with rca

            Comment


              #7
              Re: RCA led42c45rq no picture, unable to turn off

              It's only a problem with TV's that have led backlighting. Which is all of them now!
              I assume no responsibility for any stupid suggestions I might post.

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