RCA L42WD22YX6 no power (sort of)

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  • 94shadow
    Member
    • Sep 2013
    • 10
    • Canada
    #1

    RCA L42WD22YX6 no power (sort of)

    Hi, new to the forums. Got this TV from a friend who was going to throw it away so I was going to give it a shot at fixing it.
    What the TV does is when you first plug it in you get a green LED on the front for about 2 seconds then nothing. Checked the power supply and I had found one bad capacitor that had vented. It was a 450v, 22uF capacitor which I replaced and no change. I get 5v standby and no other voltages.
    When you first plug the TV in and the green LED is lit up I get 4v to the on/off port on the power supply with no other voltages. It would seem to me like the power supply is not turning on or is it supposed to turn on when you first plug the TV in? The power button on the TV does nothing.

    Any help would be appreciated. I'm a beginner with electronics but trying my best. I included pictures of the main board and power supply.

    94Shadow
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    • R_J
      Badcaps Legend
      • Jun 2012
      • 9535
      • Canada
      #2
      Re: RCA L42WD22YX6 no power (sort of)

      Try searching this site for L42WD22 you will find its most likely a fault with the back light inverters

        Comment

        • 94shadow
          Member
          • Sep 2013
          • 10
          • Canada
          #3
          Re: RCA L42WD22YX6 no power (sort of)

          Alright, thanks. I'll update with more information later.

            Comment

            • 94shadow
              Member
              • Sep 2013
              • 10
              • Canada
              #4
              Re: RCA L42WD22YX6 no power (sort of)

              I checked the two inverter boards. Caps look good, no blown fuses. No apparent damage.
              I tried searching for the same TV and same problem with no luck. It seems odd that the green LED turns off after 2 seconds and no power except the 5v standby. Any other suggestions to check? I can post pictures of the inverter boards if that will help.

                Comment

                • Ltank
                  Badcaps Veteran
                  • Jun 2013
                  • 776
                  • USA
                  #5
                  Re: RCA L42WD22YX6 no power (sort of)

                  Try disconnecting the inverters. Then power on the set, using a flashlight you would see a image if the main and Tcon are good. This also lets you know the panel is working. Now you can trouble shoot the inverter or replace it.

                    Comment

                    • 94shadow
                      Member
                      • Sep 2013
                      • 10
                      • Canada
                      #6
                      Re: RCA L42WD22YX6 no power (sort of)

                      Originally posted by Ltank
                      Try disconnecting the inverters. Then power on the set, using a flashlight you would see a image if the main and Tcon are good. This also lets you know the panel is working. Now you can trouble shoot the inverter or replace it.
                      I've tried disconnecting the inverter boards already with no change. Shouldn't the power supply turn on with the 4 volt signal from the main board when the TV is plugged in? I get no power on the 12, 18 and 24 volt coming off the power supply.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: RCA L42WD22YX6 no power (sort of)

                          That indicates a problem with the power board then.
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • 94shadow
                              Member
                              • Sep 2013
                              • 10
                              • Canada
                              #8
                              Re: RCA L42WD22YX6 no power (sort of)

                              Originally posted by tom66
                              That indicates a problem with the power board then.
                              Is there anything on the power board that I could check to indicate/troubleshoot why it's not starting?

                                Comment

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