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Vestel 17IPS72 Turn off issue

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    #1

    Vestel 17IPS72 Turn off issue

    Hi,

    I have a TV which goes into stand by after about 5- 10 minutes. The PSU seems very hot especially around Capacitors, Diodes on isolated side and MOSFET MDD14N25 is also getting extremely hot. The diodes checkout ok.

    What is most likely cause of overheat?? and where to start checking/replacing first.

    Thanks in advance
    Tags: None
    #2
    Re: Vestel 17IPS72 Turn off issue

    Can we see some pictures, I.E.the whole backside of the TV, the boards, so we can see what we are dealing with? Use 'Go Advanced' to attach the pictures.
    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

      #3
      Re: Vestel 17IPS72 Turn off issue

      Hi, apologies for delay. Here are photos. Excuse the mess. The screen was damaged so I just want to use the backlight. Have used a 7805 to supply 5v signal to keep on but it turns off after a while.
      Attached Files

      Comment

        #4
        Re: Vestel 17IPS72 Turn off issue

        Perhaps running it this way has the leds at maximum brightness which is causing the shurdown.
        Willing to help but I'm no expert.

        Comment

          #5
          Re: Vestel 17IPS72 Turn off issue Solved

          Think I've cracked it.

          I put a fan on the 12V and the 7805 on the 24v and it is staying on now.

          Probably needs load on both the 12v and 24v lines.

          In process of converting the loft and is perfect lighting

          Thanks for the help
          Attached Files

          Comment

            #6
            Re: Vestel 17IPS72 Turn off issue

            Couldn't you put the 7805 on the 12V suppply so it wouldn't run so hot.
            Willing to help but I'm no expert.

            Comment

              #7
              Re: Vestel 17IPS72 Turn off issue

              Could do its just that I had a 12v fan to load the 12v rail and the 7805 can load the 24v rail. Its still within 7805 spec but if I get a 24v fan then I'll swap it round

              Comment

                #8
                Re: Vestel 17IPS72 Turn off issue

                But if you run it on the 12V supply you hopefully would not need the fan to cool it.
                As an example:-
                If you are running it at 200mA on the 24V supply then to drop 19V across the 7805 to give 5V output would dissipate 0.2A x 19V = 3.8 Watts

                If it was on the 12v supply then it would be 0.2A x 7V = 1.4Watts
                and perhaps would not need the fan to cool it.
                Willing to help but I'm no expert.

                Comment

                  #9
                  Re: Vestel 17IPS72 Turn off issue

                  I'll give it a try and feedback.

                  I would like the fan connected though especially during hot summers if we ever get them in the UK

                  Comment

                    #10
                    Re: Vestel 17IPS72 Turn off issue

                    It was two weeks ago. Where were you
                    Willing to help but I'm no expert.

                    Comment

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