Troubleshooting rsag7.820.1673 TV Power Issue

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  • jitter1127
    New Member
    • Aug 2017
    • 4
    • USA
    #1

    Troubleshooting rsag7.820.1673 TV Power Issue

    I have a dynex dx-l40-10a and am having issues getting it to turn on. If it has been off for a while, when I hit the power button sometime the relay will not click for almost 20 seconds. After that it still does not turn on and will take usually 6-7 more tries to get it to stay on. Once the TV is on it works perfect.
    I took the back off yesterday and here are my voltages. This was with the TV off, but plugged in. The c842 (big blue capacitor) was reading like 26 micro farads, but I did not take it off the board. I am guessing that one is not the problem though? Also that one says 2000V and 22nJ how do you figure out the actual capacitance of that one?

    Thanks

    G------0
    G------0
    Stnd--73.2 mV
    5------4.8V
    5------4.8V
    12-----2.6mV
    12-----2.5mV
    G------0
    BR1---19.7mV
    SW----16.6mV
    G------0
    G------0
    5------23.2mV
    5------23.3mV
    Tags: None
    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: Troubleshooting rsag7.820.1673 TV Power Issue

      Any photo's of the boards?
      What DC voltage do you have across the two legs of C810
      Also what DC voltage do you have at junction VD813/C811 and also at junction of C811/C812.
      Recently someone with identical power supply had faulty capacitors C811/C812

      Read through the following thread
      https://www.badcaps.net/forum/showth...highlight=C811

      Schematic attached.
      Attached Files
      Last edited by dick_barton; 10-06-2017, 07:22 AM.
      Willing to help but I'm no expert.

        Comment

        • michael first
          New Member
          • Feb 2013
          • 7
          • italy
          #3
          Re: Troubleshooting rsag7.820.1673 TV Power Issue

          Hi,
          judging by the symptoms described it seems a main board issue.

            Comment

            • attainteddragon
              Badcaps Veteran
              • Apr 2013
              • 764
              • australia
              #4
              Re: Troubleshooting rsag7.820.1673 TV Power Issue

              Originally posted by jitter1127



              Stnd--73.2 mV
              you have no stby voltage, so the main board is inactive at this point.

              disconnect the harness that goes to the main and see if stby comes up, also check dcv on the main filter cap and report what you find.
              WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Troubleshooting rsag7.820.1673 TV Power Issue

                  Lets see the pictures of the boards.
                  You also need to verify these pin names:
                  G------0
                  G------0
                  Stnd--73.2 mV-------- STB?. It looks to be 'PS-ON'
                  5------4.8V -----------5V_S?
                  5------4.8V -----------5V_S?
                  12-----2.6mV
                  12-----2.5mV
                  G------0
                  BR1---19.7mV--------- = DIM
                  SW----16.6mV--------- = BL-ON
                  G------0
                  G------0
                  5------23.2mV---------5V_M?----- = SWITCHED 5V
                  5------23.3mV---------5V_M? ----- = SWITCHED 5V
                  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

                    • jitter1127
                      New Member
                      • Aug 2017
                      • 4
                      • USA
                      #6
                      Re: Troubleshooting rsag7.820.1673 TV Power Issue

                      Well I got it working. I did not do much troubleshooting I went for resoldering c811, c812, and c842 and it worked so far. I will give it a couple days and see what happens.

                        Comment

                        • dick_barton
                          Badcaps Legend
                          • Aug 2015
                          • 6642
                          • Wales
                          #7
                          Re: Troubleshooting rsag7.820.1673 TV Power Issue

                          Resoldered or replaced?
                          Willing to help but I'm no expert.

                            Comment

                            • jitter1127
                              New Member
                              • Aug 2017
                              • 4
                              • USA
                              #8
                              Re: Troubleshooting rsag7.820.1673 TV Power Issue

                              Basically just melted what what there and readded some solder

                                Comment

                                • dick_barton
                                  Badcaps Legend
                                  • Aug 2015
                                  • 6642
                                  • Wales
                                  #9
                                  Re: Troubleshooting rsag7.820.1673 TV Power Issue

                                  Hope that's all that was wrong. Good luck.
                                  Willing to help but I'm no expert.

                                    Comment

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