Vestel 17IPS72 Turn off issue

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • 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
  • 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

                    Related Topics

                    Collapse

                    • fixme2024
                      Intermittent Power Issue with HP DV6 Motherboard Occasional Failure to Turn On
                      by fixme2024
                      Hello everyone, I have an HP DV6 DAOLX6MB6F2 REV: F motherboard. The issue I'm facing is that sometimes the motherboard doesn't turn on. I've checked the voltages for the power on button panel, and they seem to be okay. Right now, it's working perfectly fine, so I can't pinpoint the exact problem. I have the HP DV6-DV7 Quanta LX6_7 (Liverpool) DAOLX6MB6F2 Rev 1A.pdf schematics, a multimeter, and a 5A power supply. If anyone could guide me on where to start checking first, I would greatly appreciate it. This is my first experience with this. Thank you.

                      Here, I have attached a document...
                      02-14-2024, 09:24 PM
                    • caspian
                      What Zener Diodes on a Linear Power Supply
                      by caspian
                      Dear members,

                      I have a linear variable power supply with unknown brand name that I used for voltage injection.
                      Then it failed. I discovered that its transistors (Q1 and Q2) are shorted.
                      In addition, I discovered that its zener diodes are defective.
                      I can replace the burned transistors.
                      But I do not know the model of the zener diodes. the model number is not marked on the zener diodes.
                      Therefore, I cannot replace the zener diodes.
                      I do not want to test the zener diodes in a test circuit to discover their model or value.
                      no schematics are available...
                      05-26-2025, 12:38 PM
                    • ResetReality
                      Toshiba/Vestel 58UL2B63DB Wifi Issue???
                      by ResetReality
                      Hello fellow tech heads.

                      Had this tv come in...issue stated reboots on wifi.

                      Indeed it does. However, with wifi off or using cat 5 cable no reboot issues.

                      So far ive changed mainboard and wifi module...also reset tv back to factory via service menu (4725)

                      Still same issue... i do have a psu to swap but cant see it being that really as works flawless if wifi is disabled

                      I thought fireware? But why only on wifi?

                      Is it an issue with the memory cache filling up and having to reboot for more ram??

                      At a total...
                      07-04-2024, 12:28 PM
                    • pajdek
                      Lenovo Y700-17ISK turn on and off
                      by pajdek
                      Hello, i have some issues with my laptop Lenovo Y700-17ISK (motherboard BY511 NM-A541), it started when i turn on the laptop, but the lcd wont turn on, i then connected it via hdmi to tv and screen was ok. So i thought maybe lcd stripe is faulty, i removed the bottom cover, disconnected main battery, reset the cmos by disconnecting battery for 1 min, then slighty move the lcd stripe. Conncted power supply and tuned on my laptop, the lcd turn on, it started to load os, then it turn off, after a second it turn on, then after like 3 seconds turn off again, and so on. Removed power supply, waited...
                      09-20-2023, 02:49 AM
                    • ovrax
                      Philips 55PUS6804/12 turn on & off (probably backlight issue)
                      by ovrax
                      Hello everyone,

                      First of all, please excuse me as I'm quite new to this field.

                      I have a Philips 55PUS6804/12 TV. It turns on and off instantly (backlight flash). I personally think it's a backlight issue (faulty LEDs). Could you help me confirm my diagnosis?

                      I've checked and the T-CON seems to be fine. I disconnected one ribbon cable at a time at the bottom, but the problem persists.
                      The Ambilight works perfectly and stays on.

                      No sounds.

                      Thanks in advance.
                      08-25-2024, 04:33 AM
                    • Loading...
                    • No more items.
                    Working...