RCA LED65G55R120Q TV Set Power issue?

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  • mwbrown1979
    New Member
    • Dec 2017
    • 3
    • United States

    #1

    RCA LED65G55R120Q TV Set Power issue?

    Hi all. I read through a previous thread regarding this same set, I'm hoping to get some confirmation that I'm on the right track. The set will flash once every 3-5 seconds when powered on. No indicator light, neither standby nor power on. During this 3-5 second cycle the screen only displays 2-3 colored horizontal lines. Will not power on. I've confirmed 120v at the power board, only reading 3-3.5v going out of it. No indications of blown capacitors from what I can see, but I am far from an expert. I read in Mr. Martin's troubleshooting guide I should have 5v standby, etc. With a reading of 3-3.5 do you blame a faulty power board? I really want this set going but I can't throw parts at it blindly Any guidance would be greatly appreciated!
  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #2
    Re: RCA LED65G55R120Q TV Set Power issue?

    Need good clear straight on pictures of back of tv with cover off and each board.
    I assume no responsibility for any stupid suggestions I might post.

    Comment

    • mwbrown1979
      New Member
      • Dec 2017
      • 3
      • United States

      #3
      Re: RCA LED65G55R120Q TV Set Power issue?

      Originally posted by dskall
      Need good clear straight on pictures of back of tv with cover off and each board.
      here goes..thank you!!
      Attached Files

      Comment

      • dskall
        Badcaps Legend
        • Oct 2016
        • 2905
        • usa

        #4
        Re: RCA LED65G55R120Q TV Set Power issue?

        Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
        Format:
        Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
        1 - XXXXXXX - XXv - XXXv
        2 - XXXXXXX - XXXv - XXXv
        3 - XXXXXXX - XXXv - XXXv
        4 - etc.
        I assume no responsibility for any stupid suggestions I might post.

        Comment

        • bkdadto3
          Member
          • Jan 2018
          • 21
          • usa

          #5
          Re: RCA LED65G55R120Q TV Set Power issue?

          I am going to jump in here and say, that I have this exact setup and I am not able to get power to come on but my voltage readings confuse me. Here is what I get at the power board capacitor: 166.9 vdc

          At con2 I get
          Pin
          1 EMPTY
          2 EMPTY
          3 GND
          4 GND
          5 13.23 V THIS IS LABELED AS 12V
          6 13.23 V THIS IS LABELED AS 12V
          7 GND
          8 13.23 V THIS IS LABELED AS 12V
          9 GND
          10 GND
          11 GND
          12 5.1 V THIS IS LABELED AS 5V
          13 5.1 V THIS IS LABELED AS 5V
          14 5.1 V THIS IS LABELED AS 5V
          15 4.46 V THIS IS LABELED AS PS ON
          16 5.09 V THIS IS LABELED AS 5 VSB
          17 4.70 V THIS IS LABELED AS ADJ
          18 0.4 mv THIS IS LABELED AS BK ON


          Trying to figure out if this is a main board issue or a power board issue.

          Comment

          • dskall
            Badcaps Legend
            • Oct 2016
            • 2905
            • usa

            #6
            Re: RCA LED65G55R120Q TV Set Power issue?

            Do you see an image if you put a flashlight up to the screen?
            I assume no responsibility for any stupid suggestions I might post.

            Comment

            • bkdadto3
              Member
              • Jan 2018
              • 21
              • usa

              #7
              Re: RCA LED65G55R120Q TV Set Power issue?

              No, no video, no led nothing at all.

              Comment

              • bkdadto3
                Member
                • Jan 2018
                • 21
                • usa

                #8
                Re: RCA LED65G55R120Q TV Set Power issue?

                This is the state all of the time, all of these voltages are present but no leds are lit anywhere and there is no ability to turn on the tv.

                Comment

                • dskall
                  Badcaps Legend
                  • Oct 2016
                  • 2905
                  • usa

                  #9
                  Re: RCA LED65G55R120Q TV Set Power issue?

                  What is voltage on ps_on when you push power button and when in standby? 18 0.4 mv THIS IS LABELED AS BK ON maybe backlight. Other voltages seem OK
                  I assume no responsibility for any stupid suggestions I might post.

                  Comment

                  • bkdadto3
                    Member
                    • Jan 2018
                    • 21
                    • usa

                    #10
                    Re: RCA LED65G55R120Q TV Set Power issue?

                    The voltage is 4.46 v with the switch depressed and when it is not. The power on button makes no difference at all, there are no power leds even lit up on the tv to indicate standby power.

                    Comment

                    • dskall
                      Badcaps Legend
                      • Oct 2016
                      • 2905
                      • usa

                      #11
                      Re: RCA LED65G55R120Q TV Set Power issue?

                      What is voltage on ps_on when unplugged from main board?
                      I assume no responsibility for any stupid suggestions I might post.

                      Comment

                      • bkdadto3
                        Member
                        • Jan 2018
                        • 21
                        • usa

                        #12
                        Re: RCA LED65G55R120Q TV Set Power issue?

                        zero volts

                        0.0 v

                        Comment

                        • bkdadto3
                          Member
                          • Jan 2018
                          • 21
                          • usa

                          #13
                          Re: RCA LED65G55R120Q TV Set Power issue?

                          Still my main cap is only seeing 167.9 vdc

                          Comment

                          • CapLeaker
                            Leaking Member
                            • Dec 2014
                            • 8043
                            • Canada

                            #14
                            Re: RCA LED65G55R120Q TV Set Power issue?

                            When the tv goes into test pattern, check the main filter cap voltage and the 24V rail. It sounds like a bad main board to me, but first verify voltages on the PSU. If push comes to shove, disconnect everything from the PSU and force it on. If that PSU checks out all right, then it is a main board problem.
                            Last edited by CapLeaker; 02-19-2018, 05:51 PM.

                            Comment

                            • bkdadto3
                              Member
                              • Jan 2018
                              • 21
                              • usa

                              #15
                              Re: RCA LED65G55R120Q TV Set Power issue?

                              Well, the person decided to take it to their brother to be worked on. I may never know the root cause. Thanks for the help.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: RCA LED65G55R120Q TV Set Power issue?

                                PS-ON is present but you still have only 160Vdc on the filter cap, it shoould be 380~400VDC because the board has PFC Voltage booster circuit, you need to get the PFC circuit working first.
                                How much experience do you have troubleshooting down to component level and SMD reworks?
                                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

                                Comment

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