VESTEL 17IPS61-3 shorted output diodes

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • guybrushthreepwood
    Member
    • Dec 2013
    • 44
    • Italy

    #81
    Re: VESTEL 17IPS61-3 shorted output diodes

    I was wondering about the readings I've got: the recurring one (11.2V) is more or less what I've already got with my previous measures on the mainboard connector while the other (21.3V) is a newcomer... I don't know what to think but, though a bit under the expected (especially for the 24V rail), it may mean that we have 12V and 24V so the problem could be with the 5V rail... Or may the diodes be not shorted but failing and could this be the reason for the under rated readings?
    Last edited by guybrushthreepwood; 06-14-2018, 10:24 AM.

    Comment

    • guybrushthreepwood
      Member
      • Dec 2013
      • 44
      • Italy

      #82
      Re: VESTEL 17IPS61-3 shorted output diodes

      Given that at this point I don't even dare to hope I would ever be able to repair this board, I was consindering buying a replacement. I've found a 17IPS61-4 at a very good price but the board layout is different (the connectors are the same though). Are -3 and -4 interchangeable being -4 just a newer revision or not? I've searched for a 17IPS61-4 schematic to find the reply by myself but unfortunately I haven't succeeded in finding one: I've found schematics only for 17IPS61-3 and 17IPS61-2.
      Thanks in advance for your advices (even on the repair of the board I already have should this be the case) and have a good day!
      Last edited by guybrushthreepwood; 06-25-2018, 09:35 AM.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #83
        Re: VESTEL 17IPS61-3 shorted output diodes

        17IPS61-3 is the blank PCB P/N which can be stuffed with many parts to make many PCBA's for many TV models, you need to get the PCBA P/N on the bar code sticker. Is there bar code sticker some where on the 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

        • guybrushthreepwood
          Member
          • Dec 2013
          • 44
          • Italy

          #84
          Re: VESTEL 17IPS61-3 shorted output diodes

          Hi budm and thanks for your advice. Unfortunately, there isn't any sticker anywhere on the psu. I'm quite confident the model is 17IPS61-3, that's all. I guess 17IPS61 is the family and the number which comes afterwards declares the board revision or something similar but I don't know if one is interchangeable with another; I don't think so notwithstanding the fact that the connectors placement and shape is exactly the same on all of those boards.
          By the way, there are great news! My tv is back in the business! Before definitively giving up, I've decided to make a last try: I've left the psu alone for a while and I've started thinking about the mainboard (I recall that my issue was the red standby led blinking forever with the tv connected to a power outlet). Well, the problem was exactly there!
          My mainboard is a Vestel 17MB82S and searching here and elsewhere I've found out that the eeproms (there are two of them on the mainboard, one near to the other: U12 and U10) on these boards are quite unreliable.
          • Here I've found the software for my tv (mb82 and mb82s are the same thing according to my research before and my experience just a bit after)
          • I've taken a pendrive, I've formatted it FAT32 and I've put the file upgrade_loader.pkg (you need to extract it) alone in the root of the pendrive
          • I've put the pendrive in the usb port of the tv while it was unplugged from the wall outlet then I've started to press the OK button on the remote
          • While keeping it pressed I've connected the tv power plug to the wall outlet
          • I've kept the OK button pressed till the red led has started to blink rapidly then I've released it

          The recovery has taken a couple of minutes (during the process the led on the pendrive would obviously blink as it does the red standby led on the tv) but you would notice the end of the process by the fact that the television would reboot by itself.
          Someone on an italian forum has suggested to short pin 5 and 6 (the two ones, one near to the other on the lower right of the flash, on the corner opposite to the one where the embossed point which marks pin1 is) on U12 and someone has reported success with that approach but I think the solution summarized above by me is safer and better to be tried before, leaving the short between the two pins as a last resort (I haven't tried nor I will). Here and here are the posts I'm speaking of (in italian).
          I know this is a slight OT but I hope that sharing my experience would be useful for someone experiencing an issue like mine in the future.
          I still don't understand the reason for those strange voltage readings on the PSU but I'm quite happy and I'd like to thank you all for your help and advices, especially dick_barton who has teached me a lot of useful things!
          Last edited by guybrushthreepwood; 06-28-2018, 12:01 PM.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #85
            Re: VESTEL 17IPS61-3 shorted output diodes

            https://www.badcaps.net/forum/showpo...8&postcount=62
            As you can see, this one uses the same blank PCB as your but the board may be stuffed differently than your board, this board has bar code on it.
            Glad you solved the problem.
            Last edited by budm; 06-28-2018, 02:40 PM.
            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

            • guybrushthreepwood
              Member
              • Dec 2013
              • 44
              • Italy

              #86
              Re: VESTEL 17IPS61-3 shorted output diodes

              You're certainly right: I haven't ever thought the contrary as I haven't the necessary knowledge and insight. I was just pondering... I hope I haven't offended you: though it wasn't my intention, I apologize should this have been the case. Have a good day and thanks again for your help and the time you've given me!

              Comment

              • dellxps15
                Badcaps Legend
                • Feb 2014
                • 1588
                • italy

                #87
                Re: VESTEL 17IPS61-3 shorted output diodes

                tnx for this topic, today i repaired one toshiba tv by changing the 3 diode.

                Comment

                Related Topics

                Collapse

                • Askic
                  TVS diode shorted on HP motherboard
                  by Askic
                  Hello guys,
                  I have seen a few videos on youtube about repiring HP 15 pavilion laptops that has TVS (Transient Voltage Suppressor) diode shorted to the ground.
                  Please have a look at the attached picture.
                  The diode is P4SMAJ20A and according to the datasheet its breakdown voltage (at 1 mA is 22.2V or 24.6V at10 mA).
                  THis means that if voltage goes higher that 23V this diode will start conducting and short to ground thus protecting rest of the circuits from overvoltage.

                  What I don't understand if is this diode reversible, for example if voltage goes below 20...
                  12-30-2020, 11:56 AM
                • Donny2derby
                  Help identifying shorted diode.
                  by Donny2derby
                  Hi there all.

                  Troubleshooting an SMPS and I’ve found a SMD diode shorted in both directions. The trouble is it has no identification on it. So what do I replace it with and how do I tell where the anode and cathode is and how to mount the replacement?

                  It is diode D1 on the image.

                  Regards.

                  Gareth....
                  03-07-2024, 08:10 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
                • madyoyo
                  Samsung QE55Q65B with shorted D001 diodes on panel board: Worth saving or not
                  by madyoyo
                  Hi

                  I have a Samsung QE55Q65B with a seemingly common problem: it turn off and back on after a few seconds, (sometimes more, and in rare instances works for hours). D001 on the left side of the panel is very hot. I may be able to remove it with a very fine iron, but i don't have the equipment to re-solder such small parts.

                  Is there a risk to run the tv without this diodes diodes? And is it worth to pay someone else to replace it. I read many people who ended up with bad lines after trying to remove/replace them, , or the panel failing in another way, so i want to weight...
                  12-01-2023, 09:28 AM
                • tvguy12012012120
                  Zombie Samsung UN55NU6900F dead / no standby voltage - randomly came to life after hours of troubleshooting then died
                  by tvguy12012012120
                  This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.

                  Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....
                  02-07-2025, 05:13 PM
                • Loading...
                • No more items.
                Working...