BUSH LC39GL12L - Stuck on standby light

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  • speedypro
    Badcaps Veteran
    • Feb 2013
    • 561
    • United Kingdom

    #1

    BUSH LC39GL12L - Stuck on standby light

    Can anyone point me in the right direction? This tv is stuck in standby mode as in a solid red light. No physical damaged seen on the power board. Whatnirmally causes a red standby light?
    Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer
  • CapLeaker
    Leaking Member
    • Dec 2014
    • 8033
    • Canada

    #2
    Re: BUSH LC39GL12L - Stuck on standby light

    umm... no pics, nothing to look at. I'd measure if the main board sends PSon to the PSU.

    Comment

    • sordids999
      Badcaps Legend
      • May 2013
      • 2149
      • uk

      #3
      Re: BUSH LC39GL12L - Stuck on standby light

      Posting pictures of the back of your tv showing the boards with clear pictures may help you more with fixing your problem

      Comment

      • newtothis
        Badcaps Legend
        • Mar 2013
        • 1556
        • england

        #4
        Re: BUSH LC39GL12L - Stuck on standby light

        Originally posted by speedypro
        Can anyone point me in the right direction? This tv is stuck in standby mode as in a solid red light. No physical damaged seen on the power board. Whatnirmally causes a red standby light?
        Darlaston?

        You live in same town as me! Small World.

        Comment

        • speedypro
          Badcaps Veteran
          • Feb 2013
          • 561
          • United Kingdom

          #5
          Re: BUSH LC39GL12L - Stuck on standby light

          Originally posted by CapLeaker
          umm... no pics, nothing to look at. I'd measure if the main board sends PSon to the PSU.
          Sorry. No good camera to take pictures but as i have said, no visual damage etc. I do get voltage to main board. But it wont turn on, just stays on red light. W have tried another board bought on ebay and same issue but not sure if board is 100% working. We assume main board.
          Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

          Comment

          • vinceroger69
            Badcaps Legend
            • Mar 2012
            • 6714
            • uk

            #6
            Re: BUSH LC39GL12L - Stuck on standby light

            what are the board numbers on each boards.

            Comment

            • speedypro
              Badcaps Veteran
              • Feb 2013
              • 561
              • United Kingdom

              #7
              Re: BUSH LC39GL12L - Stuck on standby light

              Originally posted by vinceroger69
              what are the board numbers on each boards.
              Power Board: mip390hw rev. 1.0

              Main: t.msd306.68a 12023
              Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

              Comment

              • newtothis
                Badcaps Legend
                • Mar 2013
                • 1556
                • england

                #8
                Re: BUSH LC39GL12L - Stuck on standby light

                speedypro,

                PM me as I can help you directly

                Comment

                • speedypro
                  Badcaps Veteran
                  • Feb 2013
                  • 561
                  • United Kingdom

                  #9
                  Re: BUSH LC39GL12L - Stuck on standby light

                  Im getting all output dc voltages when I short the PSon pins. But when I attached the main board, no dc voltages. Again I have ordered a used main board off ebay and I no idea if that works or not. But why when the main board is connected to the power board I get no dc voltage? Or should I say I get dc output but just for few seconds.

                  Is it normal for the Bridge Rectifier to make a buzzing noise?
                  Last edited by speedypro; 05-02-2015, 10:17 AM.
                  Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                  Comment

                  • steviewonder
                    Senior Member
                    • Dec 2013
                    • 183
                    • england

                    #10
                    Re: BUSH LC39GL12L - Stuck on standby light

                    a common issue on the t.msd306 pcb's for this is corruption of the flash ic (the 8 pin one)
                    7 out of 10 ten times that's your issue.
                    The buzzing noise is quite normal,provided you can only just hear it.

                    Comment

                    • Andrew F. Ali
                      Badcaps Legend
                      • Jan 2014
                      • 2450
                      • Trinidad & Tobago

                      #11
                      Re: BUSH LC39GL12L - Stuck on standby light

                      Main Bd 3.3V Regulator probably has a short causing the Pwr Bd voltages to drop off. I think your used board off e-bay will work. I have acquired many 'used' Bds from e-bay and ALL have worked so far...Good luck

                      Comment

                      • melonslug
                        Member
                        • Aug 2016
                        • 19
                        • United Kingdom

                        #12
                        Re: BUSH LC39GL12L - Stuck on standby light

                        Hello, I am new to Badcaps and I have to say there are some great helpful chaps on here. I was hoping I can continue this thread a bit further and ask for some help. I also have the BUSH LC39GL12L and have the same problem, stuck on standby (blue light wont come on, only red). Just like Speedypro I have all the right voltages at the output of the power supply board mip390hw and am happy that is fine. So I presume the problem is in the main board t.msd306.68a . Now I see newtothis has ask the guy to pm him, could you help me too please newtothis? Also I see steviewonder has stated a problem with the flash ic, could you tell me where this is on the board please?Also AndrewF.Ali mentions the 3.3 regulater shorting, could you point out where this is too please. Many thanks in advance to any replies.

                        Comment

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