Samsung UN60H7150 no audio/video standby light double blinks

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  • matchlessbloake
    Member
    • Jul 2014
    • 12
    • usa
    #1

    Samsung UN60H7150 no audio/video standby light double blinks

    I am trying to fix a Samsung UN60H7150 for a friend and need some help. The red standby led comes on as soon as the tv is pluggned in and it blinks after few seconds. TV does not seem to respond to power on either from remote or from the button on the unit. The red led double blinks 5 times and then stops blinking for few seconds and then double blinks again for 5 times and so on.

    The DCV readings on the power board seem right. I was only able to take reading on the odd pin numbers and they all have 13V so I assuming PS_ON is working.


    1 - NC - 0V
    3 - PWM-DIM3 - 0V
    5 - GND - 0V
    7 - A13V - 12.8V
    9 - A13V - 12.8V
    11 - A13V - 12.8V
    13 - A13V - 12.8V
    15 - A13V - 12.8V
    17 - GND - 0V
    19 - Vamp - 12.8V
    21 - Vamp - 12.8V


    Removing cable between main and power board forces the back light to come on and stay on so it looks like the power board is fine (?).

    I have tried disconnecting WiFi/BT modules and speakers to rule out short circuit in them but it did not help. Also tried disconnecting T-CON and LED back lights but that did not help either. I had a on/off button from another Samsung 60" TV that I tried using but still no luck. Since the blinking happens even when the T-CON is disconnected, is it safe to assume it is the main board? Main board for this TV are expensive so wanted to confirm before buying it.

    Anyone has access to service manual? Thank you for your help.
    Attached Files
    Last edited by matchlessbloake; 05-21-2017, 02:34 PM. Reason: forgot to make title bold
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Samsung UN60H7150 no audio/video standby light double blinks

      "Removing cable between main and power board forces the back light to come on and stay on so it looks like the power board is fine" The power supply/LED driver and the LEDS backlghts are OK. Need to look at the main board as to why it is not sending the command signals to the power supply board.
      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

        • matchlessbloake
          Member
          • Jul 2014
          • 12
          • usa
          #3
          Re: Samsung UN60H7150 no audio/video standby light double blinks

          Thank you @budm for your reply.
          Does the double blinks mean anything? The boot-up sequence for the most of the Samsung's I have seen has a slower single blink.

          I am not able to get hold of SM so kind of stuck.

            Comment

            • jjanssen7
              Badcaps Veteran
              • Nov 2012
              • 252
              • Canada
              #4
              Re: Samsung UN60H7150 no audio/video standby light double blinks

              main board is pretty common on this model. A new one fixed mine.

                Comment

                • matchlessbloake
                  Member
                  • Jul 2014
                  • 12
                  • usa
                  #5
                  Re: Samsung UN60H7150 no audio/video standby light double blinks

                  Originally posted by jjanssen7
                  main board is pretty common on this model. A new one fixed mine.
                  Thank you @jjanssen. Have ordered new board, keeping fingers xed.

                    Comment

                    • matchlessbloake
                      Member
                      • Jul 2014
                      • 12
                      • usa
                      #6
                      Re: Samsung UN60H7150 no audio/video standby light double blinks

                      Tried replacing new main board today. Now the TV power light flashes normally (slow single blinks) and I can hear audio but no picture
                      I see backlights. Not sure if I was unlucky and got the bad main board or it is the tcon that's bad. I took a chance and ordered a new tcon. Will update here once i get it.

                        Comment

                        • dskall
                          Badcaps Legend
                          • Oct 2016
                          • 2905
                          • usa
                          #7
                          Re: Samsung UN60H7150 no audio/video standby light double blinks

                          Did you check for blown fuse on t-con
                          I assume no responsibility for any stupid suggestions I might post.

                            Comment

                            • matchlessbloake
                              Member
                              • Jul 2014
                              • 12
                              • usa
                              #8
                              Re: Samsung UN60H7150 no audio/video standby light double blinks

                              Sorry for the delay but I was out on vacation.
                              The fuse on t-con was fine. It turned out that I had received a defective main board the first time. A replacement main board fixed the issue.

                                Comment

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