Vizio VF552XVT Power Problem.

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • wadehavens
    Member
    • May 2010
    • 33

    #1

    Vizio VF552XVT Power Problem.

    Hi there.

    I'm having a problem with my TV turning off. It's shutting down when the LED driver board starts up. I've taken the power supply out in the hopes of finding some swollen caps, but all of them look fine.

    So I put the power supply back in and found that if I only plug in one of the LED driver board power plugs, the TV turns on and works. If I plug them both in the power supply turns off. So basically the problem seems to be on the 24V rail. All the voltages are present without the LED driver board plugged in. 5v,12v,18v, and 24v.

    My question is, what does the "slave" plug on the LED driver board do if the TV still works without it? , and do you think that replacing the caps on the 24v rail will do the trick?

    Thanks!!

    -Wade
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9518
    • Canada

    #2
    Re: Vizio VF552XVT Power Problem.

    Can you hold the tv in front of your monitor so we can see the boards or provide some pictures.
    How many driver boards are used? Are there 2 driver boards One Master and one Slave?
    There are2 other threads on this model that might help, use the search and use your model number to locate them
    Last edited by R_J; 08-20-2018, 07:23 PM.

    Comment

    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8000
      • Canada

      #3
      Re: Vizio VF552XVT Power Problem.

      could be a bad led in the other string too...

      Comment

      • wadehavens
        Member
        • May 2010
        • 33

        #4
        Re: Vizio VF552XVT Power Problem.

        Originally posted by R_J
        Can you hold the tv in front of your monitor so we can see the boards or provide some pictures.
        How many driver boards are used? Are there 2 driver boards One Master and one Slave?
        There are2 other threads on this model that might help, use the search and use your model number to locate them
        There is only one driver board.

        Here a couple of pics.. Sorry if they suck my phone is a piece of garbage.
        Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Vizio VF552XVT Power Problem.

          Can we at least see GOOD CLEAR FOCUSED pictures of the whole backside of the TV showing how all the boards are connected together? borrow better phone?
          We do not have the TV or the boards in front of us to look at, so it is not easy to do long distant troubleshooting, pictures are all we have to go by.
          Last edited by budm; 08-20-2018, 10:05 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

          • R_J
            Badcaps Legend
            • Jun 2012
            • 9518
            • Canada

            #6
            Re: Vizio VF552XVT Power Problem.

            So which is the plug you disconnect that causes the tv to stay on? I don't see "slave" marked on any of them. CN?

            Comment

            • wadehavens
              Member
              • May 2010
              • 33

              #7
              Re: Vizio VF552XVT Power Problem.

              Originally posted by R_J
              So which is the plug you disconnect that causes the tv to stay on? I don't see "slave" marked on any of them. CN?
              Cn2 is the plug I can have disconnect.

              Comment

              • R_J
                Badcaps Legend
                • Jun 2012
                • 9518
                • Canada

                #8
                Re: Vizio VF552XVT Power Problem.

                When Cn2 is connected does it kill the 24 volts? You should be able to check the voltage at the fuse F201 on the drive board. If the voltage is low or missing.
                Check Q211,Q212,Q204,Q205 and D202,D203, D207,D208, One or more components might be shorted.
                Last edited by R_J; 08-20-2018, 11:03 PM.

                Comment

                • wadehavens
                  Member
                  • May 2010
                  • 33

                  #9
                  Re: Vizio VF552XVT Power Problem.

                  Just a quick side note. The power supply will stay on with either cn1 or Cn2 connected, but not with both.

                  Comment

                  • wadehavens
                    Member
                    • May 2010
                    • 33

                    #10
                    Re: Vizio VF552XVT Power Problem.

                    Here is a Pic of the back of the tv
                    Attached Files

                    Comment

                    • wadehavens
                      Member
                      • May 2010
                      • 33

                      #11
                      Re: Vizio VF552XVT Power Problem.

                      Originally posted by R_J
                      When Cn2 is connected does it kill the 24 volts? You should be able to check the voltage at the fuse F201 on the drive board. If the voltage is low or missing.
                      Check Q211,Q212,Q204,Q205 and D202,D203, D207,D208, One or more components might be shorted.
                      Everything tests good. The entire power supply shuts off when both CN1 and CN2 is connected. If I unplug either one of them, the power supply works as normal. Of course, the back light does not come on when only CN2 is connected but does when only CN1 is connected.

                      Comment

                      • R_J
                        Badcaps Legend
                        • Jun 2012
                        • 9518
                        • Canada

                        #12
                        Re: Vizio VF552XVT Power Problem.

                        If you disconnect CN3 & CN4 going to the panel led's will the power supply stay on with CN1 & CN2 connected? (you will not get any backlight)

                        CN2 only has +24 volts, CN1 has +24 volts plus the control signals
                        Last edited by R_J; 08-21-2018, 08:24 PM.

                        Comment

                        • wadehavens
                          Member
                          • May 2010
                          • 33

                          #13
                          Re: Vizio VF552XVT Power Problem.

                          Originally posted by R_J
                          If you disconnect CN3 & CN4 going to the panel led's will the power supply stay on with CN1 & CN2 connected? (you will not get any backlight)

                          CN2 only has +24 volts, CN1 has +24 volts plus the control signals
                          I unplugged CN3 and CN4 and the power supply works as it should. I then reconnected CN3 and half of the backlight works. Same result with CN4 only. Then reconnected both and the supply shuts off.

                          Comment

                          • R_J
                            Badcaps Legend
                            • Jun 2012
                            • 9518
                            • Canada

                            #14
                            Re: Vizio VF552XVT Power Problem.

                            It could be that the power supply can't supply enough current
                            If you just connect one set of led's can you go into the menu and see what the backlight level is set at? and turn it down if you can and see if it makes a difference.
                            It could be one of the small caps (IE 4.7 - 22 @ 50v) that are bad in the power supply.
                            The won't look bad.

                            Comment

                            • wadehavens
                              Member
                              • May 2010
                              • 33

                              #15
                              Re: Vizio VF552XVT Power Problem.

                              Originally posted by R_J
                              It could be that the power supply can't supply enough current
                              If you just connect one set of led's can you go into the menu and see what the backlight level is set at? and turn it down if you can and see if it makes a difference.
                              It could be one of the small caps (IE 4.7 - 22 @ 50v) that are bad in the power supply.
                              The won't look bad.
                              I replaced the smaller caps. One was a 2.2 @ 50v and the other a 100 @ 50v. Neither made a difference. It still shuts down if both sides of the backlight is connected. The backlight brightness doesn't change a thing. It's for sure a problem with the 24v side, at least is seems that way, but other than replacing the big caps I'm not sure what else to do. Possibly the transistors on the 24v rail maybe?

                              If I leave it off for a day or so, it will turn on for about 40 minutes.
                              Last edited by wadehavens; 08-21-2018, 11:10 PM.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Vizio VF552XVT Power Problem.

                                So only 24V power supply shutdown but the all other power supplies still on?
                                I also want you to try this: get the backlights to come on then go to the on screen adjustment and then turn down the backlights level (not Brightness) as low as possible on all inputs, then turn off the TV and connect all the cables back in the LED driver board and see if the backlights will come on and stay on.
                                Last edited by budm; 08-21-2018, 11:36 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

                                • wadehavens
                                  Member
                                  • May 2010
                                  • 33

                                  #17
                                  Re: Vizio VF552XVT Power Problem.

                                  Originally posted by budm
                                  So only 24V power supply shutdown but the all other power supplies still on?
                                  No...the 5v stays on but the rest of the power supply shuts down. But it seems to be triggered by the 24v rail since disconnecting half of the backlight will allow the supply to start up. So I suppose it could be anywhere in the power supply other than the 5v rail.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: Vizio VF552XVT Power Problem.

                                    The 24V has its own power transformer T1 for making the 24V.
                                    The 12V and 18V are generated by another transformer T2.
                                    The standby power supply is generated by transformer T901.
                                    So something is not right that the 12V/18V section gets shutdown too.
                                    You may want to monitor the PS-ON pin to see if it drops out when shutdown happens.
                                    The power supply also PFC Voltage booster circuit that you should also check the DCV right between the two legs of the main filter cap to see what happens to that boosted Voltage.
                                    This is your power supply, right?
                                    http://www.shopjimmy.com/vizio-0500-...pply-unit.htm#
                                    Vizio 0500-0507-0670 (DPS-450RP A) Power Supply for VF552XVT
                                    Last edited by budm; 08-22-2018, 12:08 AM.
                                    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

                                    • wadehavens
                                      Member
                                      • May 2010
                                      • 33

                                      #19
                                      Re: Vizio VF552XVT Power Problem.

                                      Originally posted by budm
                                      The 24V has its own power transformer T1 for making the 24V.
                                      The 12V and 18V are generated by another transformer T2.
                                      The standby power supply is generated by transformer T901.
                                      So something is not right that the 12V/18V section gets shutdown too.
                                      You may want to monitor the PS-ON pin to see if it drops out when shutdown happens.
                                      The power supply also PFC Voltage booster circuit that you should also check the DCV right between the two legs of the main filter cap to see what happens to that boosted Voltage.
                                      This is your power supply, right?
                                      http://www.shopjimmy.com/vizio-0500-...pply-unit.htm#
                                      Vizio 0500-0507-0670 (DPS-450RP A) Power Supply for VF552XVT
                                      Yes, thats the power supply.

                                      Comment

                                      • wadehavens
                                        Member
                                        • May 2010
                                        • 33

                                        #20
                                        Re: Vizio VF552XVT Power Problem.

                                        Originally posted by budm
                                        The 24V has its own power transformer T1 for making the 24V.
                                        The 12V and 18V are generated by another transformer T2.
                                        The standby power supply is generated by transformer T901.
                                        So something is not right that the 12V/18V section gets shutdown too.
                                        You may want to monitor the PS-ON pin to see if it drops out when shutdown happens.
                                        The power supply also PFC Voltage booster circuit that you should also check the DCV right between the two legs of the main filter cap to see what happens to that boosted Voltage.
                                        This is your power supply, right?
                                        http://www.shopjimmy.com/vizio-0500-...pply-unit.htm#
                                        Vizio 0500-0507-0670 (DPS-450RP A) Power Supply for VF552XVT
                                        The PS-ON voltage stays on when the power supply shuts off. About 3.3 volts.

                                        I'm not sure where to test the voltage on the main filter cap since the cap is under the large heatsink. I've been testing the power supply mounted to the TV.

                                        Comment

                                        Related Topics

                                        Collapse

                                        • rajbot
                                          No Power problem with Vizio E60-E3
                                          by rajbot
                                          Hi all:

                                          I have a Vizio E60-E3 I am trying to troubleshoot a no power problem with. Thanks to the help on this board and elsewhere, I was pretty sure I had narrowed it to a power board problem. The board in question is a 09-60CAP0D0-00. Image attached for reference, but not of my board (tv is put away at the moment). FWIW, no obvious looking issues with the board.

                                          I measured voltage at power in and on the fuse and saw 120V, so power is getting to the board.

                                          On the pins out to the main board, I got no voltage at all on any of the pins. I assumed this...
                                          03-22-2023, 08:09 AM
                                        • Tynan Dill
                                          Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                          by Tynan Dill
                                          I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                          Upon bringing it home and plugging it up, it showed a standby light.

                                          I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                          The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                          With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                          Assuming...
                                          11-22-2024, 01:46 PM
                                        • theone111
                                          Problem with LG Plasma 60PM6700 - Random power downs
                                          by theone111
                                          I have an LG Plasma TV 60PM6700 for the past ~12 years.

                                          In the last ~3-4 months I have been having some issues.
                                          1. Problem: It started with random picture disappearing (sound still worked).
                                            Frequency: Happened about once a week.
                                            Solution: Had to turn off TV wait a few seconds before turning it on again.
                                          2. Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
                                            Frequency: Happened about once a week.
                                            Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve.
                                          3. Problem: TV shuts down
                                          ...
                                          07-22-2024, 10:36 AM
                                        • Duranitron
                                          Asus x512dk rev 2.1 power on problem
                                          by Duranitron
                                          When I reflash again the bios of hoaca388 the unit powers on and the unit lives!!! Hooray!! All voltage in the coil 3.3v, 5v and 6.7v indicate charging are all present. including the cpu voltage , EEPROM and GPU voltage the unit is now alive, normal screen booting to windows and log in screen until I power it off. Then the unit never goes on even when pressing the power button in the keyboard.. Voltage reading 19v main , 3.3v VCC in IT8225E-128 and EEPROM VCC 0 volt and the charging voltage 0 volt.

                                          Try to trace the power switch button goin to the power switch IC PU8803 (APL3533AQBI-TRG)...
                                          11-26-2024, 10:22 PM
                                        • EazyBone
                                          LG OLED55C9PUA power problem
                                          by EazyBone
                                          Hello, trying to fix C9 55 inch. I have pulled the back and all looks completely normal with nothing burnt so far. This is first time attempting to fix a tv so any help is appreciated.

                                          Problem. I hit power button, red light on TV turns off and tries to turn on, no picture shows up and then shuts off. This occurred after house power turned on and off, not from a storm.

                                          I have tested the power going from power supply to main board, all 12v and 20 volt readings are proper when I hit power button.

                                          The power supply to t con is different story.
                                          This...
                                          06-23-2023, 07:43 AM
                                        • Loading...
                                        • No more items.
                                        Working...