Vestel 17IPS72 Turn off issue

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  • axeman
    Member
    • Nov 2017
    • 25
    • United Kingdom
    #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
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #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

        • axeman
          Member
          • Nov 2017
          • 25
          • United Kingdom
          #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

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales
              #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

                • axeman
                  Member
                  • Nov 2017
                  • 25
                  • United Kingdom
                  #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

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6642
                      • Wales
                      #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

                        • axeman
                          Member
                          • Nov 2017
                          • 25
                          • United Kingdom
                          #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

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales
                              #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

                                • axeman
                                  Member
                                  • Nov 2017
                                  • 25
                                  • United Kingdom
                                  #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

                                    • dick_barton
                                      Badcaps Legend
                                      • Aug 2015
                                      • 6642
                                      • Wales
                                      #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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