Hisense rsag7.820.5687 no power no standby light

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  • EUWest
    Member
    • May 2019
    • 44
    • Germany

    #1

    Hisense rsag7.820.5687 no power no standby light

    Hi!

    I have a power supply and on the TV no standby and no power. Have already installed a replacement power supply but the same problem.

    When I test both power supplies the main capacitors while plugged in, I get 0v.

    What could be the reason for this?
    Attached Files
  • lotas
    Badcaps Legend
    • Jan 2016
    • 4526
    • Russia

    #2
    Re: Hisense rsag7.820.5687 no power no standby light

    Is it a switch? Check if the contacts are jumpered on it.
    Attached Files

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6355
      • Germany

      #3
      Re: Hisense rsag7.820.5687 no power no standby light

      yes its switch

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4526
        • Russia

        #4
        Re: Hisense rsag7.820.5687 no power no standby light

        Then, when turned on, red with blue and green with yellow should be closed.
        Attached Files

        Comment

        • EUWest
          Member
          • May 2019
          • 44
          • Germany

          #5
          Re: Hisense rsag7.820.5687 no power no standby light

          Hell no, switch was turned off while i was testing.

          Now i have standby light but it wont turn on

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6355
            • Germany

            #6
            Re: Hisense rsag7.820.5687 no power no standby light

            Originally posted by EUWest
            Hell no, switch was turned off while i was testing.

            Now i have standby light but it wont turn on
            lol.. put back yours original power boards first and tell what voltage you have on the socket which it go to main boards

            Comment

            • EUWest
              Member
              • May 2019
              • 44
              • Germany

              #7
              Re: Hisense rsag7.820.5687 no power no standby light

              But back original psu and get this voltages

              19.6
              19.6
              0
              0
              12.15
              12.15
              0
              0.004
              0
              0

              Standby at 0.004 way to low. There is a buzzing sound on psu. Does this correlate with standby voltage?

              Values are same connected or not with Mainboard.
              Attached Files

              Comment

              • nomoresonys
                Badcaps Legend
                • Jan 2013
                • 12093
                • U.S.

                #8
                Re: Hisense rsag7.820.5687 no power no standby light

                One easy thing to check when powerboard is noisy, is check all the solder joints and reflow any that look suspect, being careful not to bridge anything, some can really be hard to detect, a wiggle of the joint can detect a bad solder joint too, examples of bad joints: https://www.google.com/search?q=bad+...ih=607&dpr=1.5

                Comment

                • EUWest
                  Member
                  • May 2019
                  • 44
                  • Germany

                  #9
                  Re: Hisense rsag7.820.5687 no power no standby light

                  Thanks for this hind. Will give it a try tomorrow and Also test voltages on spare psu which i bought

                  Comment

                  • Diah
                    Badcaps Legend
                    • Feb 2013
                    • 6355
                    • Germany

                    #10
                    Re: Hisense rsag7.820.5687 no power no standby light

                    Originally posted by EUWest
                    But back original psu and get this voltages

                    19.6
                    19.6
                    0
                    0
                    12.15
                    12.15
                    0
                    0.004
                    0
                    0

                    Standby at 0.004 way to low. There is a buzzing sound on psu. Does this correlate with standby voltage?

                    Values are same connected or not with Mainboard.
                    please name the pins which read this value... so we do know where and what.

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada

                      #11
                      Re: Hisense rsag7.820.5687 no power no standby light

                      STB is the power supply ON/OFF signal that originates from the main board it is not a "standby" produced by the power supply. Your fault is likely the main board.

                      Comment

                      • EUWest
                        Member
                        • May 2019
                        • 44
                        • Germany

                        #12
                        Re: Hisense rsag7.820.5687 no power no standby light

                        Resoldering some joints fixed it. But there is still a loud buzzing sound while tv starts.

                        And even if its turned off, there is a buzzing sound too.
                        What can it be?

                        Comment

                        • Diah
                          Badcaps Legend
                          • Feb 2013
                          • 6355
                          • Germany

                          #13
                          Re: Hisense rsag7.820.5687 no power no standby light

                          first time i hear Hisense get cold / crack soldering joint... any way... plug the tv out from wall... and play with its Switch on / off how much you can... it could be the switch its contact not in tact so there are sparking.

                          for further show us the place you re soldered.

                          Comment

                          • EUWest
                            Member
                            • May 2019
                            • 44
                            • Germany

                            #14
                            Re: Hisense rsag7.820.5687 no power no standby light

                            Uploaded and marked resoldered Pins.

                            Turning on off switch doesnt fix buzzing sound
                            Attached Files

                            Comment

                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6355
                              • Germany

                              #15
                              Re: Hisense rsag7.820.5687 no power no standby light

                              Originally posted by EUWest
                              Uploaded and marked resoldered Pins.

                              Turning on off switch doesnt fix buzzing sound
                              you wrote you have replacement power supply, so use it and see if the buzzing remain.

                              Comment

                              • EUWest
                                Member
                                • May 2019
                                • 44
                                • Germany

                                #16
                                Re: Hisense rsag7.820.5687 no power no standby light

                                Replacement psu doesnt buzz. So its specific to this psu. But however Replacement psu isnt working

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12093
                                  • U.S.

                                  #17
                                  Re: Hisense rsag7.820.5687 no power no standby light

                                  Use a hairdryer to heat up those 5 electrolytic capacitors for a couple few minutes, then try it, see if there's any difference in the noise, don't wait til it cools down try it while it's still hot.

                                  Comment

                                  • Diah
                                    Badcaps Legend
                                    • Feb 2013
                                    • 6355
                                    • Germany

                                    #18
                                    Re: Hisense rsag7.820.5687 no power no standby light

                                    from yours re soldering didn't see any effect of issue TV wont tun on..

                                    you may had other issue before and it went out open.. for example the BL .. you have 2 Group you need to compare it currents if there any differences

                                    Comment

                                    • nomoresonys
                                      Badcaps Legend
                                      • Jan 2013
                                      • 12093
                                      • U.S.

                                      #19
                                      Re: Hisense rsag7.820.5687 no power no standby light

                                      Can easily check all the diodes and resistors on top of the board, youtube for tutorials if needed.

                                      Comment

                                      • nomoresonys
                                        Badcaps Legend
                                        • Jan 2013
                                        • 12093
                                        • U.S.

                                        #20
                                        Re: Hisense rsag7.820.5687 no power no standby light

                                        Also check the 3 pin components you see on heatsinks and one other, they appear to be transistors, check that none of the three pins are shorted to any of the others on the component, can look up a datasheet by putting in the info on top of component if needed. There are some 3 pin diodes that look just like transistors that will show continuity on the back 2 pins, so if ever in doubt about what you are dealing with, look up the datasheet.
                                        Last edited by nomoresonys; 04-16-2023, 07:34 AM.

                                        Comment

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